Question 1

Which of the following best describes the role of producers in a trophic structure?

Accepted Answer

They are autotrophs that support all other trophic levels by producing organic molecules from inorganic substances.

Question 2

In a food chain, which organism is most likely to be a secondary consumer?

Accepted Answer

A snake that eats rabbits

Question 3

What is the primary function of decomposers in an ecosystem?

Accepted Answer

To secrete enzymes that digest organic molecules and convert them into inorganic forms.

Question 4

Which statement about energy transfer in a food chain is correct?

Accepted Answer

Only about 10% of the energy stored at each trophic level is available to the next level.

Question 5

A field of corn can support more human vegetarians than meat-eaters because:

Accepted Answer

Energy is lost at each trophic level, so eating plants is more energy-efficient.

Question 6

Which of the following organisms would be classified as a detritivore?

Accepted Answer

A worm feeding on dead leaves

Question 7

In a food web, what does it mean if an animal weaves into more than one trophic level?

Accepted Answer

It can act as both a primary and secondary consumer depending on its diet.

Question 8

Which equation best represents the energy available at each trophic level if the initial energy at the producer level is $$E_0$$?

Accepted Answer

$$E_n = E_0$ 	imes 0.1^n$$

Question 9

Which of the following is NOT a correct match between trophic level and example organism?

Accepted Answer

Detritivore: grass

Question 10

Why does the length of food chains tend to be limited in natural ecosystems?

Accepted Answer

Because energy supply decreases at each successive trophic level.

Question 11

Which of the following best describes a food web?

Accepted Answer

A network of interconnecting food chains showing multiple feeding relationships.

Question 12

If a secondary consumer receives 100 kcal of energy, how much energy was available at the producer level, assuming 10% transfer efficiency at each level?

Accepted Answer

$$10,000$$ kcal

Question 13

Which process is responsible for converting organic material into inorganic forms in an ecosystem?

Accepted Answer

Decomposition

Question 14

Which of the following is a plausible consequence of removing decomposers from an ecosystem?

Accepted Answer

Accumulation of dead organic material and disruption of nutrient cycling

Question 15

A hawk eats a snake, which eats a mouse, which eats corn. What trophic level is the hawk?

Accepted Answer

Quaternary consumer

Question 16

Which of the following statements about consumers is correct?

Accepted Answer

Consumers are heterotrophs.

Question 17

If a food web contains both a fox and a bear, and both eat rabbits and berries, what does this illustrate?

Accepted Answer

That multiple consumers can feed on the same producer.

Question 18

Which of the following is a direct ecological cost of meat consumption, as explained by the energy pyramid?

Accepted Answer

More land and energy are required to produce meat than to produce plant-based food.

Question 19

Which group of organisms is mainly responsible for decomposition in ecosystems?

Accepted Answer

Prokaryotes and fungi

Question 20

If a food chain consists of grass → grasshopper → frog → snake, which organism is the tertiary consumer?

Accepted Answer

Snake

Trophic Structure, Food Chains, and Energy Flow in Communities

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