Biology – Class 12 Mock Test 9

10%

Question 1 of 10

1. When responses in a population are unlimited which growth is observed?

Lag phase growth

Logistic growth

Exponential growth

Decreasing growth

Question 1 of 10

Question 2 of 10

2. What is the available biomass for the consumption of heterotrophs?

GPP

GAP

NAG

NPP

Question 2 of 10

Question 3 of 10

3. What does this statement “The energy passed from producers to consumers (herbivores) does not go back to producers (autotrophs)” states about the flow of energy?

Flow is unidirectional

Flow is multidirectional

Flow is bidirectional

Flow has no specific direction

Question 3 of 10

Question 4 of 10

4. Whose population is highest in an ecosystem?

Secondary consumers

Decomposers

Primary consumers

Primary producers

Question 4 of 10

Question 5 of 10

5. Who dominates on the rocky sea coasts of Scotland?

Smaller barnacle Chathamalus

Larger and competitively superior barnacle Balanus

Aquatic plants

Shark

Question 5 of 10

Question 6 of 10

6. Which one of the following represents a pyramid of energy?

Question 6 of 10

Question 7 of 10

7. How many trophic levels do green plants constitute?

Zero level

Last trophic level

Third trophic level

First trophic level

Question 7 of 10

Question 8 of 10

8. In which of the following interaction one or both the species may be harmed?

Photosynthesis

Neutralism

Antagonism

Respiration

Question 8 of 10

Question 9 of 10

9. If in a population the natality is 20 and mortality is 10, in a span of 10 years. What is the growth rate (GR) of that population?

-10

Question 9 of 10

Question 10 of 10

10. At what rate does decomposition occur when detritus is rich in lignin and chitin?

Neutral

Slower

Moderate

Faster

Question 10 of 10