Biology Study Guide CHP 12-16

What is the main reason for the decrease in available energy as you move up the trophic levels in a food pyramid?

• Energy is lost as heat during cellular respiration.

• Energy is used up by organisms for life processes.

• Energy is not transferred efficiently from one level to the next.

Which of the following is not a primary consumer in a food chain?

• Herbivorous insects

• Cows

• Lions

How do decomposers contribute to the nutrient cycle in an ecosystem?

• They convert nutrients into energy for consumers

• They break down dead organisms, releasing nutrients back into the soil.

• They produce nutrients through photosynthesis.

Which of the following statements is true regarding trophic levels in a food pyramid?

• Each level receives 100% of the energy from the level below it.

• Each level receives 50% of the energy from the level below it.

• Each level receives only 10% of the energy from the level below it.

What would happen to the population of a predator in a food web if its prey were removed?

• The predator's population would decrease.

• The predator's population would increase.

• The predator's population would stay the same.

True or false: The role of primary consumers in a food chain is to break down dead organisms and recycle nutrients back into the ecosystem.

• True

• False

What happens to the energy that is not transferred to the next trophic level in a food pyramid?

• It is stored as fat in the organisms at the current level.

• It is lost as heat during cellular respiration.

• It is recycled back into the ecosystem by decomposers.

Which of the following is an example of a tertiary consumer in a food chain?

• A lion that eats a zebra.

• A snake that eats a mouse.

• A hawk that eats a snake.

What is the main reason why the available energy decreases as you move up the trophic levels in a food pyramid?

• Energy is lost to the environment as heat.

• Energy is used up by organisms for life processes.

• Energy is not transferred efficiently from one level to the next.

True or false: If a producer is removed form a food chain, it will only affect the primary consumers in the chain.

• True

• False