our environment Flashcards
1
Q
- Disposable plastics plates should not be used because ————–.
A. they are made up of light weight material
B. They are made of toxic materials
C. they are made up of biodegradable materials
D. they are made up of non biodegradable materials
A
D
2
Q
2. Which of the following groups contain only biodegradable items ? A. grass, flowers, leather B. grass, wood, plastics C. fruit peels, cake and lime juice D. cake, wood, grass
A
B
3
Q
- What will happen if deer is missing from the food chain : grass → deer → Tiger ?
A. the population of tiger will increase
B. tiger will start eating grass
C. the population of grass decrease
D. population of tiger decrease and grass increases
A
D
4
Q
- Which is incorrect:
A. all green plants and blue green algae are producers
B. green plants get their food from organic compounds
C. producers prepare food from inorganic substances
D. plants convert solar energy to chemical energy
A
B
5
Q
5. The % of solar radiation absorbed by all green plants for photosynthesis is about -----------. A. 1% B. 5% C. 8% D. 10%
A
A
6
Q
- If a grasshopper is eaten by frog, then the energy transfer will be from :
A. producers to decomposers
B. producer to primary consumer
C. primary consumer to secondary consumer
D. secondary consumer to primary consumer
A
C
7
Q
7. The organisms of higher trophic level which feed on several types of organisms belonging to lower trophic level, constitute the-----------------. A. food web B. ecological pyramid C. ecosystem D. food chain
A
A
8
Q
8. Which is non biodegradable? A. wood, paper, leather B. polythene, detergent, grass C. plastic, detergent, glass D. plastic, bakelite, DDT
A
D
9
Q
9. In a given food chain the amount of energy at fourth trophic level is 5 KJ, what will be the energy at producer level ? A. 5KJ B. 50KJ C. 500kJ D. 5000KJ
A
D
10
Q
10. The excessive exposure of humans to UV rays results in : A. damage immune system B. skin cancer C. peptic ulcers D. damage to lungs
A
C
11
Q
- The decomposers in ecosystem:
A. convert inorganic materials to simpler forms
B. convert organic material to inorganic forms
C. do not breakdown organic compounds
D. None
A
A
12
Q
12. The flow of energy in ecosystem : A. unidirectional B. Bidirectional C. multidirectional D. no specific direction
A
A
13
Q
13. In an ecosystem, the 10% of energy available for transfer from one trophic level to next is in the form of \_\_\_\_. A. heat energy B. light energy C. mechanical energy D. chemical energy
A
D
14
Q
- Which of the following limits the number of trophic levels in a food chain?
A. decrease in energy at higher trophic level
B. deficient in food supply
C. polluted air
D. water
A
A
15
Q
15. Which of the following constitute the food chain? A. grass,wheat and mango B. grass, goat and human C. goat , cow and elephant D. grass, fish , goat
A
B
16
Q
- Which of the following are environment friendly practices?
A. carrying cloth bags to put purchases in while shopping
B. switching off unnecessary lights and fans
C. walking to school instead of getting your mother to drop you on her scooter
D. all
A
D
17
Q
17. In a food chain, the third trophic level is always occupied by\_\_\_\_\_. A. carnivores B. herbivores C. omnivores D. decomposers
A
A
18
Q
18. An ecosystem includes \_\_\_\_\_. A. all living organisms B. non living objects C. both living and non living components D. sometimes living sometimes non living
A
C
19
Q
19. Accumulation of non-biodegradable pesticides in the food chain, in increasing amount at each higher trophic level is known as \_\_\_\_\_\_ A. Eutrophication B. pollution C. biomagnification D. accumulation
A
C
20
Q
20. Depletion of ozone is mainly due to \_\_\_\_\_\_\_\_ A. chlorofluorocarbons B. sulphur dioxide C. acid rain D. green house effect
A
A
