Question

Which of the following statements correctly states the 10% rule in ecology?

Only 10% of an organism's energy is used for growth and reproduction.

Only 10% of an ecosystem's energy is lost as heat.

Only 10% of the energy at one trophic level is transferred to the next trophic level

Only 10% of the energy in an ecosystem is stored in the form of biomass.
In an energy pyramid, which level typically has the most biomass?(1 point)

Primary consumers

Tertiary consumers

Producers

Secondary consumers
What is primary productivity?(1 point)

The rate at which energy is consumed by animals

The rate at which energy is stored by plants

The decomposition rate of organic matter

The total biomass of all organisms in an ecosystem
Biomagnification refers to:(1 point)

The decrease in toxin concentration as it moves up the food chain

The conversion of toxins to harmless substances

The spread of toxins through air and water

The increase in toxin concentration as it moves up the food chain
DDT is an example of a substance that biomagnifies. It was historically used as(1 point)

a pesticide

a fertilizer

a fungicide

a herbicide
Anaerobic respiration occurs in the absence of(1 point)

ATP

oxygen

carbon dioxide

glucose

Answer 1

1) Which statement correctly states the 10% rule in ecology?
- Correct: Only 10% of the energy at one trophic level is transferred to the next trophic level.

2) In an energy pyramid, which level typically has the most biomass?
- Correct: Producers

3) What is primary productivity?
- Correct: The rate at which energy is stored by plants

4) Biomagnification refers to:
- Correct: The increase in toxin concentration as it moves up the food chain

5) DDT is an example of a substance that biomagnifies. It was historically used as:
- Correct: a pesticide

6) Anaerobic respiration occurs in the absence of:
- Correct: oxygen