Question

in the trophic structure, autotrophs are living organisms that:
a are at the top of the chain, referred to as tertiary producers.
b photosynthetic organisms that produce their own energy
c organisms that receive their energy by consuming producers such as plants
d help to decompose the remains of dead organisms

Explanation:

Autotrophs are organisms that can produce their own food. Photosynthetic organisms (like plants) use sunlight to convert carbon dioxide and water into glucose (energy - rich molecule) through photosynthesis.

• Option A: Autotrophs are not at the top of the chain. Tertiary producers is an incorrect term. Autotrophs are producers at the base of the trophic structure.
• Option C: Organisms that consume producers are heterotrophs (e.g., herbivores).
• Option D: Organisms that decompose remains of dead organisms are decomposers (e.g., fungi, bacteria).

Answer:

B. Photosynthetic organisms that produce their own energy