Environmental Science Book Back Questions 9th Science Lesson 24
9th Science Lesson 24
24] Environmental Science
Book Back Questions with Answer and Do You Know Box Content
Do You Know?
Earthworms are referred as ‘Farmer’s friend’. After digesting organic matter, earthworms excrete a nutrient-rich waste product called castings which is used as Vermicompost.
World Water Day on 22nd March every year is about focusing attention on the importance of water.
IUCN was founded on 5th October 1948 at Gland, Switzerland.
Choose the best answers:
1. All the factors of biosphere which affect the ability of organisms to survive and reproduce are called as ______________
(a) Biological factors
(b) Abiotic factors
(c) Biotic factors
(d) Physical factors.
2. The ice sheets from the north and south poles and the icecaps on the mountains, get converted into water vapour through the process of __________
(a) Evaporation
(b) Condensation
(c) Sublimation
(d) Infiltration
3. The atmospheric carbon dioxide enters into the plants through the process of ____________
(a) Photosynthesis
(b) assimilation
(c) Respiration
(d) Decomposition
4. Increased amount of ___________ in the atmosphere, results in greenhouse effect and global warming.
(a) Carbon monoxide
(b) Sulphur dioxide
(c) Nitrogen dioxide
(d) Carbon dioxide
Match the following:
Microorganism Role played
1. Nitrosomonas – Nitrogen fixation
2. Azotobacter – Ammonification
3. Pseudomonas species – Nitrification
4. Putrefying bacteria – Denitrification
State true or false. If false, correct the statement:
1. Nitrogen is a greenhouse gas.
2. Poorly developed root is an adaptation of mesophytes.
3. Bats are the only mammals that can fly.
4. Earthworms use the remarkable high frequency system called echoes.
5. Aestivation is an adaptation to overcome cold condition.
Answers:
Choose the best answers:
1. abiotic factors 2. Evaporation 3. Photosynthesis 4. carbon dioxide
Match the following:
1.Nitrosomonas – Ammonification
2.Azotobacter- Denitrification
3.Pseudomonas species- Nitrogen fixation
4.Putrefying bacteria- Nitrification
State true or false. If false, correct the statement:
1.False
Correct answer: Nitrogen is not a green house gas
2.False
Correct answer: Mesophytes roots are well developed provided with root caps
3.True
4.False
Correct answer: Bats use the remarkable high frequency system called echoes
5.False
Correct answer: Aestivation is an adaptation to overcome hot and dry condition