Reproduction in Organisms 12th Science Online Test
Reproduction in Organisms 12th Science Online Test
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Question 1 of 55
1. Question
Which of the following are involved in life cycle of living organism?
1) Birth
2) Growth
3) Maturation
4) ReproductionCorrect
Living organisms show a life cycle involving birth, growth, development, maturation, reproduction and death.
Incorrect
Living organisms show a life cycle involving birth, growth, development, maturation, reproduction and death.
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Question 2 of 55
2. Question
Which of the following statement is correct?
1) Reproduction is the fundamental feature of all living organisms
2) It is a biological process by which organisms produce their young ones.
3) The young ones grow and mature to repeat the processCorrect
Reproduction is the fundamental feature of all living organisms. It is a biological process by which organisms produce their young ones. The young ones grow and mature to repeat the process. Thus reproduction results in continuation of species and introduces variations in organisms, which are essential for adaptation and evolution of their own kind.
Incorrect
Reproduction is the fundamental feature of all living organisms. It is a biological process by which organisms produce their young ones. The young ones grow and mature to repeat the process. Thus reproduction results in continuation of species and introduces variations in organisms, which are essential for adaptation and evolution of their own kind.
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Question 3 of 55
3. Question
Which of the following process are involved in modes of reproduction?
1) Synthesis of RNA
2) Replication of DNA
3) Nitrogen cycle
4) Cell divisionCorrect
All modes of reproduction have some basic features such as synthesis of RNA and proteins, replication of DNA, cell division and growth, formation of reproductive units and their fertilization to form new individuals.
Incorrect
All modes of reproduction have some basic features such as synthesis of RNA and proteins, replication of DNA, cell division and growth, formation of reproductive units and their fertilization to form new individuals.
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Question 4 of 55
4. Question
How many major modes of reproduction are there?
Correct
Organisms exhibit two major modes of reproduction namely asexual reproduction and sexual reproduction.
Incorrect
Organisms exhibit two major modes of reproduction namely asexual reproduction and sexual reproduction.
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Question 5 of 55
5. Question
Which of the following statement about Asexual reproduction is correct?
1) It involves gamete formation
2) Asexual reproduction is usually by amitotic or mitotic division of the somatic (body) cells
3) It is also known as somatogenic or blastogenic reproductionCorrect
Reproduction by a single parent without the involvement of gamete formation is asexual reproduction and the offspring produced are genetically identical. Asexual reproduction is usually by amitotic or mitotic division of the somatic (body) cells, hence is also known as somatogenic or blastogenic reproduction.
Incorrect
Reproduction by a single parent without the involvement of gamete formation is asexual reproduction and the offspring produced are genetically identical. Asexual reproduction is usually by amitotic or mitotic division of the somatic (body) cells, hence is also known as somatogenic or blastogenic reproduction.
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Question 6 of 55
6. Question
How many gametes are involved in sexual reproduction?
Correct
When two parents participate in the reproductive process involving two types of gametes (ova and sperm), it is called sexual reproduction.
Incorrect
When two parents participate in the reproductive process involving two types of gametes (ova and sperm), it is called sexual reproduction.
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Question 7 of 55
7. Question
In which of the following Asexual reproduction is common?
1) Bacteria
2) Archaea
3) ProtistaCorrect
Asexual reproduction is wide spread among different organisms. It is common in members of Protista, Bacteria, Archaea and in multicellular organisms with relatively simple organisation.
Incorrect
Asexual reproduction is wide spread among different organisms. It is common in members of Protista, Bacteria, Archaea and in multicellular organisms with relatively simple organisation.
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Question 8 of 55
8. Question
Which of the following statement about Asexual reproduction is correct?
1) The off-springs show “uniparental inheritance” with genetic variation
2) The different modes of asexual reproduction seen in animals are fission, budding, fragmentation and regenerationCorrect
The off-springs by Asexual reproduction show “uniparental inheritance” without any genetic variation. The different modes of asexual reproduction seen in animals are fission, budding, fragmentation and regeneration.
Incorrect
The off-springs by Asexual reproduction show “uniparental inheritance” without any genetic variation. The different modes of asexual reproduction seen in animals are fission, budding, fragmentation and regeneration.
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Question 9 of 55
9. Question
____ is the division of the parent body into two or more identical daughter individuals
Correct
Fission is the division of the parent body into two or more identical daughter individuals. Five types of fission are seen in animals. They are binary fission, multiple fission, plasmotomy, strobilation and sporulation.
Incorrect
Fission is the division of the parent body into two or more identical daughter individuals. Five types of fission are seen in animals. They are binary fission, multiple fission, plasmotomy, strobilation and sporulation.
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Question 10 of 55
10. Question
Which of the following statement about Binary fission is correct?
1) In binary fission, the parent organism divides into two halves and each half forms a daughter individual.
2) The nucleus divides first a-mitotically or mitotically, followed by the division of the cytoplasm
3) The resultant off-springs are genetically identical to the parent.Correct
In binary fission, the parent organism divides into two halves and each half forms a daughter individual. The nucleus divides first a-mitotically or mitotically (karyokinesis), followed by the division of the cytoplasm (cytokinesis). The resultant off-springs are genetically identical to the parent.
Incorrect
In binary fission, the parent organism divides into two halves and each half forms a daughter individual. The nucleus divides first a-mitotically or mitotically (karyokinesis), followed by the division of the cytoplasm (cytokinesis). The resultant off-springs are genetically identical to the parent.
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Question 11 of 55
11. Question
Depending on the plane of fission, binary fission is classified into____ types
Correct
Depending on the plane of fission, binary fission is of the following four types,
i) Simple irregular binary fission
ii) Transverse binary fission
iii) Longitudinal binary fission
iv) Oblique binary fissionIncorrect
Depending on the plane of fission, binary fission is of the following four types,
i) Simple irregular binary fission
ii) Transverse binary fission
iii) Longitudinal binary fission
iv) Oblique binary fission -
Question 12 of 55
12. Question
Which of the following statement is correct?
1) Simple irregular binary fission is seen in Virus
2) The contractile vacuoles cease to function and disappear
3) The nucleoli disintegrate and the nucleus divides mitoticallyCorrect
Simple irregular binary fission is seen in Amoeba like irregular shaped organisms, where the plane of division is hard to observe. The contractile vacuoles cease to function and disappear. The nucleoli disintegrate and the nucleus divides mitotically. The cell then constricts in the middle, so the cytoplasm divides and forms two daughter cells.
Incorrect
Simple irregular binary fission is seen in Amoeba like irregular shaped organisms, where the plane of division is hard to observe. The contractile vacuoles cease to function and disappear. The nucleoli disintegrate and the nucleus divides mitotically. The cell then constricts in the middle, so the cytoplasm divides and forms two daughter cells.
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Question 13 of 55
13. Question
In Paramecium the macronucleus divides by____ and the micronucleus divides by____
Correct
In transverse binary fission, the plane of the division runs along the transverse axis of the individual. e.g. Paramecium and Planaria. In Paramecium the macronucleus divides by amitosis and the micronucleus divides by mitosis.
Incorrect
In transverse binary fission, the plane of the division runs along the transverse axis of the individual. e.g. Paramecium and Planaria. In Paramecium the macronucleus divides by amitosis and the micronucleus divides by mitosis.
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Question 14 of 55
14. Question
Which of the following statement is correct?
1) In longitudinal binary fission, the nucleus and the cytoplasm divides in the longitudinal axis of the organism
2) In flagellates, the flagellum is retained usually by one daughter cell.
3) The basal granule is divided into two and the new basal granule forms a flagellum in the other daughter individualCorrect
In longitudinal binary fission, the nucleus and the cytoplasm divides in the longitudinal axis of the organism. In flagellates, the flagellum is retained usually by one daughter cell. The basal granule is divided into two and the new basal granule forms a flagellum in the other daughter individual. e.g. Vorticella and Euglena.
Incorrect
In longitudinal binary fission, the nucleus and the cytoplasm divides in the longitudinal axis of the organism. In flagellates, the flagellum is retained usually by one daughter cell. The basal granule is divided into two and the new basal granule forms a flagellum in the other daughter individual. e.g. Vorticella and Euglena.
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Question 15 of 55
15. Question
Oblique binary fission is seen in______
Correct
In oblique binary fission the plane of division is oblique. It is seen in dinoflagellates. e.g. Ceratium.
Incorrect
In oblique binary fission the plane of division is oblique. It is seen in dinoflagellates. e.g. Ceratium.
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Question 16 of 55
16. Question
Which of the following statement is correct?
1) In multiple fission the parent body divides into many similar daughter cells simultaneously
2) Each cytoplasmic part encircles one daughter nucleus
3) If multiple fission produces four or many daughter individuals by equal cell division and the young ones do not separate until the process is complete, then this division is called repeated fission.Correct
In multiple fission the parent body divides into many similar daughter cells simultaneously. First, the nucleus divides repeatedly without the division of the cytoplasm, later the cytoplasm divides into as many parts as that of nuclei. Each cytoplasmic part encircles one daughter nucleus. This results in the formation of many smaller individuals from a single parent organism. If multiple fission produces four or many daughter individuals by equal cell division and the young ones do not separate until the process is complete, then this division is called repeated fission. e.g. Vorticella.
Incorrect
In multiple fission the parent body divides into many similar daughter cells simultaneously. First, the nucleus divides repeatedly without the division of the cytoplasm, later the cytoplasm divides into as many parts as that of nuclei. Each cytoplasmic part encircles one daughter nucleus. This results in the formation of many smaller individuals from a single parent organism. If multiple fission produces four or many daughter individuals by equal cell division and the young ones do not separate until the process is complete, then this division is called repeated fission. e.g. Vorticella.
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Question 17 of 55
17. Question
During unfavourable conditions Amoeba withdraws its pseudopodia and secretes a___ wall
Correct
During unfavourable conditions (increase or decrease in temperature, scarcity of food) Amoeba withdraws its pseudopodia and secretes a three-layered, protective, chitinous cyst wall around it and becomes inactive. This phenomenon is called encystment.
Incorrect
During unfavourable conditions (increase or decrease in temperature, scarcity of food) Amoeba withdraws its pseudopodia and secretes a three-layered, protective, chitinous cyst wall around it and becomes inactive. This phenomenon is called encystment.
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Question 18 of 55
18. Question
Which of the following statement is correct?
1) In the process of strobilation, several transverse fissions occur simultaneously giving rise to a number of individuals
2) They often do not separate immediately from each other
3) Aurelia is an example of StrobilationCorrect
In the process of strobilation, several transverse fissions occur simultaneously giving rise to a number of individuals which often do not separate immediately from each other e.g. Aurelia.
Incorrect
In the process of strobilation, several transverse fissions occur simultaneously giving rise to a number of individuals which often do not separate immediately from each other e.g. Aurelia.
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Question 19 of 55
19. Question
__is the division of multinucleated parent into many multinucleate daughter individuals with the division of nuclei
Correct
Plasmotomy is the division of multinucleated parent into many multinucleate daughter individuals with the division of nuclei. Nuclear division occurs later to maintain normal number of nuclei. Plasmotomy occurs in Opalina and Pelomyxa (Giant Amoeba).
Incorrect
Plasmotomy is the division of multinucleated parent into many multinucleate daughter individuals with the division of nuclei. Nuclear division occurs later to maintain normal number of nuclei. Plasmotomy occurs in Opalina and Pelomyxa (Giant Amoeba).
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Question 20 of 55
20. Question
During unfavourable conditions Amoeba multiplies by____ without encystment
Correct
During unfavourable conditions Amoeba multiplies by sporulation without encystment. Nucleus breaks into several small fragments or chromatin blocks. Each fragment develops a nuclear membrane, becomes surrounded by cytoplasm and develops a spore-case around.
Incorrect
During unfavourable conditions Amoeba multiplies by sporulation without encystment. Nucleus breaks into several small fragments or chromatin blocks. Each fragment develops a nuclear membrane, becomes surrounded by cytoplasm and develops a spore-case around.
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Question 21 of 55
21. Question
Which of the following statement is correct?
1) In budding, the parent body produces one or more buds and each bud grows into a young one.
2) The buds separate from the parent cannot lead a normal life
3) In sponges, the buds constrict and detach from the parent body and the bud develops into a new spongeCorrect
In budding, the parent body produces one or more buds and each bud grows into a young one. The buds separate from the parent to lead a normal life. In sponges, the buds constrict and detach from the parent body and the bud develops into a new sponge.
Incorrect
In budding, the parent body produces one or more buds and each bud grows into a young one. The buds separate from the parent to lead a normal life. In sponges, the buds constrict and detach from the parent body and the bud develops into a new sponge.
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Question 22 of 55
22. Question
Exogenous budding is found in____
Correct
When buds are formed on the outer surface of the parent body, it is known as exogenous budding. e.g. Hydra
Incorrect
When buds are formed on the outer surface of the parent body, it is known as exogenous budding. e.g. Hydra
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Question 23 of 55
23. Question
Which of the following statement about bud formation in Hydra is correct?
1) In Hydra when food is plenty, the ectoderm cells increase and form a small elevation on the body surface
2) Ectoderm and endoderm are pushed out to form the bud.
3) The bud contains an interior lumen in continuation with parent’s gastro-vascular cavityCorrect
In Hydra when food is plenty, the ectoderm cells increase and form a small elevation on the body surface. Ectoderm and endoderm are pushed out to form the bud. The bud contains an interior lumen in continuation with parent’s gastro-vascular cavity. The bud enlarges, develops a mouth and a circle of tentacles at its free end. When fully grown, the bud constricts at the base and finally separates from the parent body and leads an independent life.
Incorrect
In Hydra when food is plenty, the ectoderm cells increase and form a small elevation on the body surface. Ectoderm and endoderm are pushed out to form the bud. The bud contains an interior lumen in continuation with parent’s gastro-vascular cavity. The bud enlarges, develops a mouth and a circle of tentacles at its free end. When fully grown, the bud constricts at the base and finally separates from the parent body and leads an independent life.
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Question 24 of 55
24. Question
Endogenous budding is found in___
Correct
In Noctiluca, hundreds of buds are formed inside the cytoplasm and many remain within the body of the parent. This is called endogenous budding.
Incorrect
In Noctiluca, hundreds of buds are formed inside the cytoplasm and many remain within the body of the parent. This is called endogenous budding.
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Question 25 of 55
25. Question
Which of the following statement is correct?
1) In freshwater sponges and in some marine sponges a regular and peculiar mode of asexual reproduction occurs by internal buds
2) It is known as Gemmules
3) A completely grown gemmule is a soft ball, consisting of an internal mass of food-laden archaeocytesCorrect
In freshwater sponges and in some marine sponges a regular and peculiar mode of asexual reproduction occurs by internal buds called gemmules is seen. A completely grown gemmule is a hard ball, consisting of an internal mass of food-laden archaeocytes. During unfavourable conditions, the sponge disintegrates but the gemmule can withstand adverse conditions. When conditions become favourable, the gemmules begin to hatch.
Incorrect
In freshwater sponges and in some marine sponges a regular and peculiar mode of asexual reproduction occurs by internal buds called gemmules is seen. A completely grown gemmule is a hard ball, consisting of an internal mass of food-laden archaeocytes. During unfavourable conditions, the sponge disintegrates but the gemmule can withstand adverse conditions. When conditions become favourable, the gemmules begin to hatch.
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Question 26 of 55
26. Question
Which of the following statement is correct?
1) In fragmentation, the parent body breaks into fragments
2) Fragmentation or pedal laceration occurs in many genera of sea anemones.
3) Lobes are constricted off from the pedal disc and each of the lobe grows mesenteries and tentacles to form a new sea anemoneCorrect
In fragmentation, the parent body breaks into fragments (pieces) and each of the fragment has the potential to develop into a new individual. Fragmentation or pedal laceration occurs in many genera of sea anemones. Lobes are constricted off from the pedal disc and each of the lobe grows mesenteries and tentacles to form a new sea anemone.
Incorrect
In fragmentation, the parent body breaks into fragments (pieces) and each of the fragment has the potential to develop into a new individual. Fragmentation or pedal laceration occurs in many genera of sea anemones. Lobes are constricted off from the pedal disc and each of the lobe grows mesenteries and tentacles to form a new sea anemone.
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Question 27 of 55
27. Question
Which of the following statement is correct?
1) In the tapeworm, Taenia Solium the gravid (ripe) proglottids are the oldest at the posterior end of the strobila
2) The gravid proglottids are regularly cut off either singly or in groups from the posterior end by a process called apolysisCorrect
In the tapeworm, Taenia Solium the gravid (ripe) proglottids are the oldest at the posterior end of the strobila. The gravid proglottids are regularly cut off either singly or in groups from the posterior end by a process called apolysis.
Incorrect
In the tapeworm, Taenia Solium the gravid (ripe) proglottids are the oldest at the posterior end of the strobila. The gravid proglottids are regularly cut off either singly or in groups from the posterior end by a process called apolysis.
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Question 28 of 55
28. Question
Which of the following is the Secondary host of Tanium Solium?
Correct
In Taenia Solium, apolysis is very significant since it helps in transferring the developed embryos from the primary host (man) to find a secondary host (pig).
Incorrect
In Taenia Solium, apolysis is very significant since it helps in transferring the developed embryos from the primary host (man) to find a secondary host (pig).
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Question 29 of 55
29. Question
Regeneration was first studied in Hydra by____
Correct
Regeneration is regrowth in the injured region. Regeneration was first studied in Hydra by Abraham Trembley in 1740.
Incorrect
Regeneration is regrowth in the injured region. Regeneration was first studied in Hydra by Abraham Trembley in 1740.
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Question 30 of 55
30. Question
Morphallaxis type regeneration is found in___
Correct
Regeneration is of two types, morphallaxis and epimorphosis. In morphallaxis the whole body grows from a small fragment e.g. Hydra and Planaria. When Hydra is accidentally cut into several pieces, each piece can regenerate the lost parts and develop into a whole new individual.
Incorrect
Regeneration is of two types, morphallaxis and epimorphosis. In morphallaxis the whole body grows from a small fragment e.g. Hydra and Planaria. When Hydra is accidentally cut into several pieces, each piece can regenerate the lost parts and develop into a whole new individual.
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Question 31 of 55
31. Question
Which of the following statement is correct?
1) Epimorphosis is the replacement of lost body parts.
2) It is of two types, namely reparative and restorative regeneration
3) In reparative regeneration, only certain damaged tissue can be regeneratedCorrect
Epimorphosis is the replacement of lost body parts. It is of two types, namely reparative and restorative regeneration. In reparative regeneration, only certain damaged tissue can be regenerated, e.g. human beings whereas in restorative regeneration severed body parts can develop. e.g. star fish, tail of wall lizard.
Incorrect
Epimorphosis is the replacement of lost body parts. It is of two types, namely reparative and restorative regeneration. In reparative regeneration, only certain damaged tissue can be regenerated, e.g. human beings whereas in restorative regeneration severed body parts can develop. e.g. star fish, tail of wall lizard.
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Question 32 of 55
32. Question
Which of the following statement about sexual reproduction is correct?
1) Sexual reproduction involves the fusion of male and female gametes
2) It results in the formation of Haploid zygote
3) This results in genetic variationCorrect
Sexual reproduction involves the fusion of male and female gametes to form a diploid zygote, which develops into a new organism. It leads to genetic variation.
Incorrect
Sexual reproduction involves the fusion of male and female gametes to form a diploid zygote, which develops into a new organism. It leads to genetic variation.
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Question 33 of 55
33. Question
What are the types of sexual reproduction in animals?
1) Sporulation
2) Conjugation
3) SyngamyCorrect
The types of sexual reproduction seen in animals are syngamy (fertilization) and conjugation. In syngamy, the fusion of two haploid gametes takes place to produce a diploid zygote.
Incorrect
The types of sexual reproduction seen in animals are syngamy (fertilization) and conjugation. In syngamy, the fusion of two haploid gametes takes place to produce a diploid zygote.
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Question 34 of 55
34. Question
How many types of fertilization are there?
Correct
Depending upon the place where the fertilization takes place, it is of two types: Internal fertilization and external fertilization.
Incorrect
Depending upon the place where the fertilization takes place, it is of two types: Internal fertilization and external fertilization.
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Question 35 of 55
35. Question
Which of the following is not an example of external fertilization?
Correct
Depending upon the place where the fertilization takes place, it is of two types. In external fertilization, the fusion of male and female gametes takes place outside the body of female organisms in the water medium. e.g. sponges, fishes and amphibians
Incorrect
Depending upon the place where the fertilization takes place, it is of two types. In external fertilization, the fusion of male and female gametes takes place outside the body of female organisms in the water medium. e.g. sponges, fishes and amphibians
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Question 36 of 55
36. Question
Which of the following is not an example of Internal fertilization?
Correct
In internal fertilization, the fusion of male and female gametes takes place within the body of female organisms. e.g. reptiles, Aves and mammals.
Incorrect
In internal fertilization, the fusion of male and female gametes takes place within the body of female organisms. e.g. reptiles, Aves and mammals.
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Question 37 of 55
37. Question
Which of the following statement is incorrect?
1) Sponge when macerated and squeezed through fine silk cloth, the cluster of cells pass through, and these can regenerate new sponges
2) This technique is used for cultivation of sponges.Correct
Sponge when macerated and squeezed through fine silk cloth, the cluster of cells pass through, and these can regenerate new sponges. This technique is used for cultivation of sponges.
Incorrect
Sponge when macerated and squeezed through fine silk cloth, the cluster of cells pass through, and these can regenerate new sponges. This technique is used for cultivation of sponges.
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Question 38 of 55
38. Question
Which of the following statement is correct?
1) The male and female gametes are produced by the same cell in Autogamy
2) Paramecium is an example of AutogamyCorrect
The male and female gametes are produced by the same cell or same organism and both the gametes fuse together to form a zygote. e.g. Actinosphaerium and Paramecium.
Incorrect
The male and female gametes are produced by the same cell or same organism and both the gametes fuse together to form a zygote. e.g. Actinosphaerium and Paramecium.
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Question 39 of 55
39. Question
Which of the following statement is correct about Exogamy?
1) The male and female gametes are produced by different parents
2) It is uniparental
3) Male and female gametes fuse together to form zygoteCorrect
Exogamy- The male and female gametes are produced by different parents and they fuse to form a zygote. So, it is biparental. e.g. Human – dioecious or unisexual animal
Incorrect
Exogamy- The male and female gametes are produced by different parents and they fuse to form a zygote. So, it is biparental. e.g. Human – dioecious or unisexual animal
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Question 40 of 55
40. Question
Which of the following statement is correct?
1) In Hologamy, lower organisms, sometimes the entire mature organisms do not form gametes
2) They themselves behave as gametes
3) Trichonympha is an example of HologamyCorrect
Lower organisms, sometimes the entire mature organisms do not form gametes but they themselves behave as gametes and the fusion of such mature individuals is known as hologamy e.g. Trichonympha.
Incorrect
Lower organisms, sometimes the entire mature organisms do not form gametes but they themselves behave as gametes and the fusion of such mature individuals is known as hologamy e.g. Trichonympha.
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Question 41 of 55
41. Question
Paedogamy is the sexual union of young individuals produced immediately after the division of
the adult parent cell by___Correct
Paedogamy- It is the sexual union of young individuals produced immediately after the division of the adult parent cell by mitosis.
Incorrect
Paedogamy- It is the sexual union of young individuals produced immediately after the division of the adult parent cell by mitosis.
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Question 42 of 55
42. Question
Which of the following statement is incorrect?
1) Merogamy is the fusion of small sized and morphologically different gametes (merogametes) takes place
2) The fusion of morphological and physiological identical gametes (isogametes) is called isogamyCorrect
Merogamy- The fusion of small sized and morphologically different gametes (merogametes) takes place
Isogamy- The fusion of morphological and physiological identical gametes (isogametes) is called isogamy. e.g. Monocystis.Incorrect
Merogamy- The fusion of small sized and morphologically different gametes (merogametes) takes place
Isogamy- The fusion of morphological and physiological identical gametes (isogametes) is called isogamy. e.g. Monocystis. -
Question 43 of 55
43. Question
Which of the following statement is correct?
1) The fusion of similar gametes is called anisogamy
2) Anisogamy occurs in higher animals but it is customary to use the term fertilization instead of anisogamy or syngamyCorrect
The fusion of dissimilar gametes is called anisogamy (Gr. An-without; iso-equal; gam-marriage). Anisogamy occurs in higher animals but it is customary to use the term fertilization instead of anisogamy or syngamy. e.g. higher invertebrates and all vertebrates.
Incorrect
The fusion of dissimilar gametes is called anisogamy (Gr. An-without; iso-equal; gam-marriage). Anisogamy occurs in higher animals but it is customary to use the term fertilization instead of anisogamy or syngamy. e.g. higher invertebrates and all vertebrates.
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Question 44 of 55
44. Question
Which of the following statement is correct?
1) Conjugation is the permanent union of the two individuals of the same species
2) During their union both individuals, called the conjugants exchange certain amount of nuclear material (DNA) and then get separated.
3) Paramecium is an example of conjugationCorrect
Conjugation is the temporary union of the two individuals of the same species. During their union both individuals, called the conjugants exchange certain amount of nuclear material (DNA) and then get separated. Conjugation is common among ciliates, e.g. Paramecium, Vorticella and bacteria (Prokaryotes).
Incorrect
Conjugation is the temporary union of the two individuals of the same species. During their union both individuals, called the conjugants exchange certain amount of nuclear material (DNA) and then get separated. Conjugation is common among ciliates, e.g. Paramecium, Vorticella and bacteria (Prokaryotes).
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Question 45 of 55
45. Question
How phases of life cycle does organisms have?
Correct
Phases of life cycle: Organisms have three phases – Juvenile phase, reproductive phase and senescent phase.
Incorrect
Phases of life cycle: Organisms have three phases – Juvenile phase, reproductive phase and senescent phase.
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Question 46 of 55
46. Question
Which of the following statement is correct?
1) Juvenile phase/ vegetative phase is the period of growth between the birth of the individual up to reproductive maturity
2) During reproductive phase/ maturity phase the organisms reproduce and their off-springs reach maturity periodCorrect
Juvenile phase/ vegetative phase is the period of growth between the birth of the individual up-to reproductive maturity. During reproductive phase/ maturity phase the organisms reproduce and their off-springs reach maturity period.
Incorrect
Juvenile phase/ vegetative phase is the period of growth between the birth of the individual up-to reproductive maturity. During reproductive phase/ maturity phase the organisms reproduce and their off-springs reach maturity period.
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Question 47 of 55
47. Question
Which of the following statement is correct?
1) On the basis of time, breeding animals are of two types
2) Seasonal breeders reproduce at particular period of the year such as frogs
3) Continuous breeders continue to breed throughout their sexual maturityCorrect
On the basis of time, breeding animals are of two types: seasonal breeders and continuous breeders. Seasonal breeders reproduce at particular period of the year such as frogs, lizards, most birds, deers etc., Continuous breeders continue to breed throughout their sexual maturity e.g. honey bees, poultry, rabbit etc
Incorrect
On the basis of time, breeding animals are of two types: seasonal breeders and continuous breeders. Seasonal breeders reproduce at particular period of the year such as frogs, lizards, most birds, deers etc., Continuous breeders continue to breed throughout their sexual maturity e.g. honey bees, poultry, rabbit etc
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Question 48 of 55
48. Question
Senescent phase begins at the end of___
Correct
Senescent phase begins at the end of reproductive phase when degeneration sets in the structure and functioning of the body.
Incorrect
Senescent phase begins at the end of reproductive phase when degeneration sets in the structure and functioning of the body.
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Question 49 of 55
49. Question
Development of an egg into a complete individual without fertilization is known as___
Correct
Development of an egg into a complete individual without fertilization is known as parthenogenesis.
Incorrect
Development of an egg into a complete individual without fertilization is known as parthenogenesis.
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Question 50 of 55
50. Question
Which of the following statement is correct?
1) Parthenogenesis was first discovered by Charles Bonnet in 1745
2) Parthenogenesis is of two main types namely, Natural Parthenogenesis and Artificial Parthenogenesis.
3) In certain animals, parthenogenesis occurs regularly, constantly and naturally in their life cycleCorrect
Parthenogenesis was first discovered by Charles Bonnet in 1745. Parthenogenesis is of two main types namely, Natural Parthenogenesis and Artificial Parthenogenesis. In certain animals, parthenogenesis occurs regularly, constantly and naturally in their life cycle and is known as natural parthenogenesis.
Incorrect
Parthenogenesis was first discovered by Charles Bonnet in 1745. Parthenogenesis is of two main types namely, Natural Parthenogenesis and Artificial Parthenogenesis. In certain animals, parthenogenesis occurs regularly, constantly and naturally in their life cycle and is known as natural parthenogenesis.
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Question 51 of 55
51. Question
Which of the following is an example of Arrhenotoky?
Correct
Arrhenotoky: In this type only males are produced by parthenogenesis. e.g. honey bees
Thelytoky: In this type only females are produced by parthenogenesis. e.g. SolenobiaIncorrect
Arrhenotoky: In this type only males are produced by parthenogenesis. e.g. honey bees
Thelytoky: In this type only females are produced by parthenogenesis. e.g. Solenobia -
Question 52 of 55
52. Question
Which of the following is an example of Amphitoky?
Correct
Amphitoky: In this type parthenogenetic egg may develop into individuals of any sex. e.g. Aphis
Incorrect
Amphitoky: In this type parthenogenetic egg may develop into individuals of any sex. e.g. Aphis
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Question 53 of 55
53. Question
Which of the following statement is correct?
1) Natural parthenogenesis may be of two types
2) Complete parthenogenesis is the only form of reproduction in certain animal
3) Incomplete parthenogenesis is found in some animals in which both sexual reproduction and parthenogenesis occursCorrect
Natural parthenogenesis may be of two types, viz., complete and incomplete. Complete parthenogenesis is the only form of reproduction in certain animals and there is no biparental sexual reproduction. There are no male organisms and so, such individuals are represented by females only. Incomplete parthenogenesis is found in some animals in which both sexual reproduction and parthenogenesis occurs.
Incorrect
Natural parthenogenesis may be of two types, viz., complete and incomplete. Complete parthenogenesis is the only form of reproduction in certain animals and there is no biparental sexual reproduction. There are no male organisms and so, such individuals are represented by females only. Incomplete parthenogenesis is found in some animals in which both sexual reproduction and parthenogenesis occurs.
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Question 54 of 55
54. Question
In honeybees; fertilized eggs (zygotes) develop into____
1) Queen
2) Drones
3) WorkerCorrect
In honeybees; fertilized eggs (zygotes) develop into queen and workers, whereas unfertilized eggs develop into drones (male). In paedogenetic parthenogenesis (paedogenesis) the larvae produce a new generation of larvae by parthenogenesis. It occurs in the sporocysts and Redia larvae of liver fluke. It is also seen in the larvae of some insects.
Incorrect
In honeybees; fertilized eggs (zygotes) develop into queen and workers, whereas unfertilized eggs develop into drones (male). In paedogenetic parthenogenesis (paedogenesis) the larvae produce a new generation of larvae by parthenogenesis. It occurs in the sporocysts and Redia larvae of liver fluke. It is also seen in the larvae of some insects.
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Question 55 of 55
55. Question
Which of the following are examples of Artificial parthenogenesis?
1) Mammals
2) Annelid
3) Seaurchin eggsCorrect
In artificial parthenogenesis, the unfertilized egg (ovum) is induced to develop into a complete individual by physical or chemical stimuli. e.g., Annelid and seaurchin eggs.
Incorrect
In artificial parthenogenesis, the unfertilized egg (ovum) is induced to develop into a complete individual by physical or chemical stimuli. e.g., Annelid and seaurchin eggs.
Leaderboard: Reproduction in Organisms 12th Science Online Test
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