Question

a pond is located on the edge of a forest. a fox hides behind a tree, waiting for prey to drink at the pond. at the edge of the pond, a beetle nibbles on grass. a fish swims beneath the water, waiting for the beetle to fly over the pond so it can jump to eat it. the fox is not interested in the beetle or the fish. instead, she watches a frog on a lily pad. the frogs tongue whips out and it eats the beetle. a chipmunk that is also eating grass jumps in alarm and runs for the forest. the fox chases and catches the chipmunk. which shows one way in which energy flows from primary consumer to secondary consumer in this food web?
beetle - frog
grass - beetle
fox - chipmunk
chipmunk - grass

Explanation:

Step1: Identify primary and secondary consumers

A primary consumer is an organism that eats producers (like plants). A secondary consumer is an organism that eats primary consumers.

• In “grass - beetle”, grass is a producer (not relevant for energy flow from primary to secondary consumer).
• In “beetle - frog”, beetle is a primary consumer (eats plants, though not shown here but assumed as per the context of the problem) and frog is a secondary consumer.

Step2: Check other options

• In “chipmunk - grass”, chipmunk is a primary consumer (eats grass - a producer), no secondary consumer in this pair.
• In “fox - chipmunk”, chipmunk is a primary consumer and fox is a secondary consumer but the direction is from primary (chipmunk) to secondary (fox) which is not what the question asks (asks for energy flow from primary to secondary as per the described scenario where the frog eats the beetle - primary to secondary).
• In “grass - beetle”, again no energy flow from primary to secondary consumer as grass is a producer.

Answer:

beetle -- frog