Question

how does energy flow in a food chain?
a from tertiary consumers to primary consumers
b from consumers to producers
c from primary consumers to producers
d from decomposers to producers
e from producers to various levels of consumers

Explanation:

In a food chain, producers (like plants) convert sunlight into energy through photosynthesis. Consumers (herbivores, carnivores, etc.) then obtain energy by eating producers or other consumers. Energy moves from producers to different levels of consumers. Options a - d are incorrect as energy doesn't flow from consumers to producers (b, c), from tertiary to primary consumers (a) or from decomposers to producers (d). Decomposers break down dead organisms but energy flow in the food - chain context (as a linear flow) is from producers to consumers.

Answer:

E. From producers to various levels of consumers