Q: Which equation best represents the calculation of trophic efficiency between two adjacent trophic levels?

$$\text{Trophic Efficiency} = \frac{\text{Energy at higher trophic level}}{\text{Energy at lower trophic level}} \times 100$$

Question 1

Which organism in the left column of the image represents the tertiary consumer in its food chain?

Accepted Answer

The hawk

Question 2

In the marine food chain shown on the right side of the image, which organism is the primary consumer?

Accepted Answer

Zooplankton

Question 3

Based on the trophic structure depicted, which color box would best represent the producer level in both terrestrial and marine food chains?

Accepted Answer

The green box at the bottom

Question 4

If the population of the secondary consumer (snake or fish) were to drastically decrease, what would likely happen to the population of the primary consumer (mouse or zooplankton)?

Accepted Answer

It would increase due to reduced predation

Question 5

Which of the following best describes the role of phytoplankton in the marine food chain shown?

Accepted Answer

Producer

Question 6

If a toxin is introduced at the producer level, which trophic level would likely accumulate the highest concentration of the toxin due to biomagnification?

Accepted Answer

Tertiary consumer

Question 7

Which equation best represents the calculation of trophic efficiency between two adjacent trophic levels?

Accepted Answer

$$	ext{Trophic Efficiency} = \frac{	ext{Energy at higher trophic level}}{	ext{Energy at lower trophic level}} 	imes 100$$

Question 8

Which of the following is a correct sequence of trophic levels from bottom to top in the terrestrial food chain shown?

Accepted Answer

Producer → Primary consumer → Secondary consumer → Tertiary consumer

Question 9

If the flower population (producer) is reduced by 50%, what is the most likely immediate effect on the mouse population (primary consumer)?

Accepted Answer

The mouse population will decrease

Question 10

Which of the following best explains why decomposers are not explicitly shown in the food chains depicted in the image?

Accepted Answer

Decomposers operate at all trophic levels, recycling nutrients from dead organisms

General Biology: Community Ecology, Ecosystems, and Conservation Study Guide

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