Question

according to the food web above, which of the following accurately depicts a food chain from the food web?
a krill→phytoplankton→sand lance
b salmon→krill→cephalopod
c zooplankton→phytoplankton→fox
d phytoplankton→sand lance→puffin

Explanation:

A food chain shows the flow of energy from one organism to another. In a food chain, producers (like phytoplankton) are eaten by primary consumers, which are then eaten by secondary consumers, etc.

• Option a: The order is wrong. Phytoplankton (producer) should come first, not krill.
• Option b: The order is wrong. Krill (primary consumer) should come before salmon (secondary consumer) and cephalopod should come after krill if there is a feeding relationship.
• Option c: Zooplankton eat phytoplankton (the order is wrong here) and there is no indication fox is part of this food - web (as per the given diagram).
• Option d: Phytoplankton (producer) is eaten by sand lance (primary consumer). Although "puffin" is not in the given diagram, if we assume it's a higher - level consumer (similar to kittiwake, gull, auklet which are birds and could be in the same trophic level as a puffin), this option has the correct producer - primary consumer - higher - level consumer order.

Answer:

d. Phytoplankton → sand lance → puffin