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Reproduction In Plants And Animals Book Back Questions 10th Science Lesson 17

10th Science Lesson 17

17] Reproduction In Plants And Animals

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Do You Know?

The number of primordial follicles in new born female child ranges over 7 million and during reproductive period (at puberty) the number is around 60,000 to 70,000. During a woman’s lifetime, she will only ovulate 300 to 400 of the 1 – 2 million eggs, she was initially born with. On the other side, men will produce over 500 billion sperms in their lifetime.

Menstruation is a periodical phenomenon that continues from puberty to menopause, this will happen if the released ovum is not fertilized by the sperm. Lack of menstruation generally indicates pregnancy.

Normally one egg matures in the ovary each month. Ovulation is the rupture of the follicle releasing the egg or ovum. The uterus prepares itself to receive the fertilized egg every month. The uterine lining becomes thick and spongy for implantation of the fertilized egg.

Events leading to when fertilization occurs and does not occur: If fertilization takes place the corpus luteum persists, continues to secrete progesterone maintains the thickened state of uterine wall and prevents maturation of another follicle till the end of pregnancy. If fertilization does not occur, corpus luteum degenerates, the egg disintegrates and the uterine lining slowly breaks, discharged as blood and mucus leading to menstrual events.

The milk produced from the breast during the first 2 to 3 days after child birth is called colostrums. It contains immune substances and provides immunity to the new born which is essential for the body.

Sometimes ovaries release two eggs and each is fertilized by a different sperm, resulting in Non-Identical Twins (Fraternal Twins). If single egg is fertilized and then divides into two foetus, Identical Twins develop.

The inverted red triangle is a symbol of family planning in India for family welfare. It is displayed prominently at all hospitals, primary health clinics and family welfare centres where any help or advice about family planning is available free of cost. The symbol is displaced along with a slogan Small Family, Happy Family.

Every year May 28 is observed as Menstrual Hygiene day to make girls and women aware of maintaining menstrual hygiene and importance of menstrual hygiene for good health. By way of awareness through films, discussions and campaigns menstrual hygiene has taken quite the centre stage in recent days.

The menstrual hygiene scheme to provide subsidized sanitary napkins was launched by the Health ministry in 2011. In Tamil Nadu, UNICEF has developed an affordable incinerator that uses firewood to handle sanitary napkin waste at schools and special wells are equipped where sanitary napkins are composed.

Choose the best answers:

1. The plant which propagates with the help of its leaves is ____________

(a) Onion

(b) Neem

(c) Ginger

(d) Bryophyllum

2. Asexual reproduction takes place through budding in _____________

(a) Amoeba

(b) Yeast

(c) Plasmodium

(d) Bacteria

3. Syngamy results in the formation of _____________

(a) Zoospores

(b) Conidia

(c) Zygote

(d) Chlamydospores

4. The essential parts of a flower are ________________

(a) Calyz and Corolla

(b) Calyx and Androecium

(c) Corolla and Gynoecium

(d) Androecium and Gynoecium

5. Anemophilous flowers have _______________

(a) Sessile stigma

(b) Small smooth stigma

(c) Coloured flower

(d) Large feathery stigma

6. Male gametes in angiosperms are formed by the division of ________________

(a) Generative cell

(b) Vegetative cell

(c) Microspore mothercell

(d) Microspore

7. What is true of gametes?

(a) They are diploid

(b) They give rise to gonads

(c) They produce hormones

(d) They are formed from gonads

8. A single highly coiled tube where sperms are stored, get concentrated and mature is known as

(a) Epididymis

(b) Vasa efferentia

(c) Vas deferens

(d) Seminiferous tubules

9. The large elongated cells that provide nutrition to developing sperms are

(a) Primary germ cells

(b) Sertoli cells

(c) Leydig cells

(d) Spermatogonia

10. Estrogen is secreted by

(a) Anterior pituitary

(b) Primary follicle

(c) Graffian follicle

(d) Corpus luteum

11. Which one of the following is an IUCD?

(a) Copper – T

(b) Oral pills

(c) Diaphragm

(d) Tubectomy

Fill in the blanks:

1. The embryo sac in a typical dicot at the time of fertilization is ___________

  1. Male Gametophyte
  2. Female Gametophyte
  3. Gametophyte
  4. None of the above

2. After fertilization the ovary develops into _____________

  1. Seed
  2. Flower
  3. Fruit
  4. None of the above

3. Planaria reproduces asexually by ______________

  1. Regeneration
  2. Budding
  3. Pollination
  4. None of the above

4. Fertilization is ___________ in humans.

  1. External
  2. Internal
  3. Intermediate
  4. None of the above

5. The implantation of the embryo occurs at about ______________ day of fertilization.

  1. 6 to 7
  2. 6 to 8
  3. 6 to 9
  4. 6 to 10

6. ________________ is the first secretion from the mammary gland after child birth.

  1. Milk
  2. Colostrum
  3. Plasma
  4. None of the above

7. Prolactin is a hormone produced by _______________

  1. Posterior Pituitary
  2. Anterior Pituitary
  3. Pituitary
  4. None of the above

(a) Match the following:

Column I Column 2

1. Fission – Spirogyra

2. Budding – Amoeba

3. Fragmentation – Yeast

(b) Match the following terms with their respective meanings:

(a) Parturition – Duration between pregnancy and birth

(b) Gestation – Attachment of zygote to endometrium

(c) Ovulation – Delivery of baby from uterus

(d) Implantation – Release of egg from Graafian follicle

State true or false. If false, correct the statement:

1. Stalk of the ovule is called pedicle.

2. Seeds are the product of asexual reproduction.

3. Yeast reproduces asexually by means of multiple fission.

4. The part of the pistil which serves as a receptive structure for the pollen is called as style.

5. Insect pollinated flowers are characterized by dry and smooth pollen.

6. Sex organ produce gametes which are diploid.

7. LH is secreted by the posterior pituitary.

8. Menstrual cycle ceases during pregnancy.

9. Surgical methods of contraception prevent gamete formulation.

10. The increased level of estrogen and progesterone is responsible for menstruation.

Answers:

Choose the following:

1.Broyophyllum 2. Yeast 3. Zygote 4. Androceium and Gynoceium 5. Large feathery stigma 6. Generative cell

7. They are formed from gonads 8. Epididymis 9.

  1. Stertoli cells 10. Graffian Follicle 11. Copper T

Fill in the blanks:

1.Female Gametophyte 2. Fruit 3. Regeneration 4. Internal 5. 6 to 7 6.

  1. Colostrum 7. Anterior Pituitary

Match the Following:

a)

1. Amoeba 2. Yeast 3. Spirogyra.

b)

1. Delivery of baby from uterus 2. Duration between pregnancy and birth 3. Release of egg from Graafian follicle

4. Attachment of zygote to endometrium

True or False:

  1. False – Stalk of the ovule is called funiculus.
  2. False – Seeds are the product of Sexual reproduction.
  3. False – Yeast reproduces asexually by means of budding.
  4. False – The part of the pistil which serves as a receptive structure for the pollen is called as stigma.
  5. False – Insect pollinated flowers are characterized by larger and spiny pollen.
  6. False – Sex organs produce gametes, which are haploid.
  7. False – LH is secreted by the anterior pituitary.
  8. True
  9. True
  10. False – The decreased level of estrogen and progesterone is responsible for menstruation

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