Question

number correct 3 number incorrect 0
which trophic level in the following food chain has the most available energy?
a. the tertiary consumers (sharks)
b. the primary producers (the algae)
c. the primary consumers (the green fishes)
d. the secondary consumers (the red fishes)

Explanation:

In a food chain, energy transfer follows the 10% rule. Primary producers (like algae) convert sunlight into energy via photosynthesis. As energy moves up trophic levels (primary consumers, secondary consumers, tertiary consumers), about 90% of energy is lost at each step (used for metabolism, heat, etc.). So, the lowest trophic level (primary producers) has the most available energy.

Answer:

B. The primary producers (the algae)