Choose the Correct Answers

Botany : Ecosystem

Evaluation

I Choose the most suitable answer from the given four alternatives and write the option code and the corresponding answer.

1. Which of the following is not a abiotic component of the ecosystem?

a) Bacteria

b) Humus

c) Organic compounds

d) Inorganic compounds

2. Which of the following is / are not a natural ecosystem?

a) Forest ecosystem

b) Rice field

c) Grassland ecosystem

d) Desert ecosystem

3. Pond is a type of

a) forest ecosystem

b) grassland ecosystem

c) marine ecosystem

d) fresh water ecosystem

4. Pond ecosystem is

a) not self sufficient and self regulating

b) partially self sufficient and self regulating

c) self sufficient and not self regulating

d) self sufficient and self regulating

5. Profundal zone is predominated by heterotrophs in a pond ecosystem, because of

a) with effective light penetration

b) no effective light penetration

c) complete absence of light

d) a and b

6. Solar energy used by green plants for photosynthesis is only

a) 2 – 8%

b) 2 – 10%

c) 3 – 10%

d) 2 – 9%

7. Which of the following ecosystem has the highest primary productivity?

a) Pond ecosystem

b) Lake ecosystem

c) Grassland ecosystem

d) Forest ecosystem

8. Ecosystem consists of

a) decomposers

b) producers

c) consumers

d) all of the above

9. Which one is in descending order of a food chain

a) Producers → Secondary consumers → Primary consumers → Tertiary consumers

b) Tertiary consumers → Primary consumers → Secondary consumers → Producers

c) Tertiary consumers → Secondary consumers → Primary consumers → Producers

d) Tertiary consumers → Producers → Primary consumers → Secondary consumers

10. Significance of food web is / are

a) it does not maintain stability in nature

b) it shows patterns of energy transfer

c) it explains species interaction

d) b and c

11. The following diagram represents

a) pyramid of number in a grassland ecosystem

b) pyramid of number in a pond ecosystem

c) pyramid of number in a forest ecosystem

d) pyramid of biomass in a pond ecosystem

12. Which of the following is / are not the mechanism of decomposition

a) Eluviation

b) Catabolism

c) Anabolism

d) Fragmentation

13. Which of the following is not a sedimentary cycle

a) Nitrogen cycle

b) Phosphorous cycle

c) Sulphur cycle

d) Calcium cycle

14. Which of the following are not regulating services of ecosystem services

i) Genetic resources

ii) Recreation and aesthetic values

iii) Invasion resistance

iv) Climatic regulation

a) i and iii

b) ii and iv

c) i and ii

d) i and iv