-Examine the figure. Zooplankton feed on phytoplankton that are contaminated by PCBs in the water. Which comparison correctly describes the concentration of PCBs in different trophic levels?
A)Primary consumers have higher PCB concentration than secondary consumers.
B)Quaternary consumers have the highest PCB concentration.
C)Tertiary consumers have the highest PCB concentration.
D)Cod has a higher PCB concentration than the secondary consumers.

Question

-Examine the figure. Zooplankton feed on phytoplankton that are contaminated by PCBs in the water. Which comparison correctly describes the concentration of PCBs in different trophic levels?
A)Primary consumers have higher PCB concentration than secondary consumers. 
B)Quaternary consumers have the highest PCB concentration. 
C)Tertiary consumers have the highest PCB concentration. 
D)Cod has a higher PCB concentration than the secondary consumers.

Quizplus · Accepted Answer

In a food chain, PCBs and other toxins tend to bioaccumulate, meaning they increase in concentration as they move up trophic levels. Quaternary consumers, being at the top of the food chain, typically have the highest concentration of PCBs.

-Examine the Figure