Trophic Levels and Energy Pyramids Quiz

1. Why is an energy pyramid wider at the bottom than at the top?

More energy is available at lower trophic levels

There are fewer organisms at the bottom

Plants are larger than animals

Decomposers work faster at the bottom

2. Which organism is NOT part of a food chain?

Sun

Plant

Herbivore

Carnivore

3. Which organisms form the base of an energy pyramid?

Producers (plants)

Primary consumers

Secondary consumers

Decomposers

Producers, primarily plants, form the base of an energy pyramid because they convert sunlight into energy through photosynthesis. This energy is then passed on to primary consumers when they consume the plants, establishing a foundational level of energy that supports all higher trophic levels in the ecosystem.

Explanation

Producers, primarily plants, form the base of an energy pyramid because they convert sunlight into energy through photosynthesis. This energy is then passed on to primary consumers when they consume the plants, establishing a foundational level of energy that supports all higher trophic levels in the ecosystem.

4. What role do decomposers play in an energy pyramid?

They break down dead organisms and return nutrients to soil

They produce energy from sunlight

They consume only primary consumers

They sit at the top of the energy pyramid

5. If a plant produces 100,000 kcal of energy, approximately how much is available to a primary consumer?

100,000 kcal

50,000 kcal

10,000 kcal

1,000 kcal

6. Which statement about trophic levels and energy pyramids is true?

Energy increases as you move up trophic levels

More biomass exists at higher trophic levels

Energy decreases as you move up trophic levels

All trophic levels contain equal energy

7. Which type of organism is essential for cycling nutrients back into the soil?

Producers

Primary consumers

Decomposers

Secondary consumers

8. In a food chain, grass → grasshopper → bird → hawk, how many trophic levels are shown?

2

3

4

5

9. What percentage of energy is typically passed from one trophic level to the next?

10%

50%

75%

100%

Energy transfer between trophic levels is inefficient, with approximately 90% of energy being lost as heat, metabolic processes, or waste. Consequently, only about 10% of the energy from one trophic level is available to the next, highlighting the limitations of energy flow in ecosystems.

Explanation

Energy transfer between trophic levels is inefficient, with approximately 90% of energy being lost as heat, metabolic processes, or waste. Consequently, only about 10% of the energy from one trophic level is available to the next, highlighting the limitations of energy flow in ecosystems.

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11. A rabbit eats clover, and a fox eats the rabbit. What is the rabbit's trophic level?

Producer

Primary consumer

Secondary consumer

Decomposer