# Class 12 Biology MCQ – Ecological Pyramids – 3

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This set of Class 12 Biology Chapter 14 Multiple Choice Questions & Answers (MCQs) focuses on “Ecological Pyramids – 3”.

1. What does the following pyramid represent?

a) Upright pyramid of energy
b) Inverted pyramid of biomass
c) Upright pyramid of number
d) Inverted pyramid of energy

Explanation: The following pyramid represents the amount of biomass/productivity of the ecosystem at each level. It is an inverted pyramid of biomass as observed in a pond ecosystem where the biomass of zooplankton exceeds the biomass of phytoplankton.

2. What does the following pyramid represent?

a) An inverted pyramid of biomass
b) Upright pyramid of energy
c) Inverted pyramid of energy
d) Upright pyramid of number

Explanation: The following pyramid represents the amount of biomass/productivity of the ecosystem at each level. It is an inverted pyramid of biomass as observed in a pond ecosystem where the biomass of zooplankton exceeds the biomass of phytoplankton.

3. What does the following pyramid represent?

a) Pyramid of number
b) An ideal pyramid
c) An inverted pyramid of energy
d) Pyramid of biomass

Explanation: The following pyramid represents an ideal pyramid of energy. In this figure, we can observe that primary producers convert only 1% of available sunlight energy. The amount of energy transferred from organic matter in a food chain from one trophic level to another is 10 percent.

4. What does the following pyramid represent?

a) An upright pyramid of age structure of an ocean ecosystem
b) An inverted pyramid of biomass of an ocean ecosystem
c) An inverted pyramid of energy of an ocean ecosystem
d) An upright pyramid of number of the grassland ecosystem

Explanation: The following pyramid represents an upright pyramid of number of a grassland ecosystem. The pyramid of numbers represents the number of individuals at each level (producers forming the base and top carnivores forming the tip).

5. What does the following pyramid represent?

a) An upright pyramid of age structure of an ocean ecosystem
b) An inverted pyramid of energy of an ocean ecosystem
c) An upright pyramid of number of the grassland ecosystem
d) An inverted pyramid of biomass of an ocean ecosystem

Explanation: The following pyramid represents an upright pyramid of number of a grassland ecosystem. The pyramid of numbers represents the number of individuals at each level (producers forming the base and decomposers forming the tip).

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

a) A
b) B
c) C
d) D

Explanation: The pyramid of energy is said to be the best representation of an ecosystem because it indicates the rate of energy flow through the food chain. Depending upon the nature of the food chain, the pyramid is always upright.

7. Which one of the following represents a pyramid of numbers?

a) A and C
b) B and C
c) A and D
d) A and B

Explanation: The pyramid of numbers represents the number of individuals at every trophic level (producers forming the base and top carnivores forming the tip). Depending upon the nature of the food chain, the pyramid is either inverted or upright.

8. Which one of the following represents a pyramid of biomass?

a) A and C
b) A and D
c) A and B
d) B and C

Explanation: The total dry weight of the total amount of living matter at each level (from producers to consumers) is represented by the pyramid of biomass. Depending upon the nature of the food chain, the pyramid is either inverted or upright.

Sanfoundry Global Education & Learning Series – Biology – Class 12.