An ecosytem can be depicted by the simplified food chain shown; autotrophs form

Question

An ecosytem can be depicted by the simplified food chain shown; autotrophs form the foundation of the ecosystem, above them are different levels of heterotrophs (e.g., herbivores, carnivores).  Heterotrophs and autotrophs both eventually become fodder for the decomposers that break down dead organic material.  Among statements A, B, and C, which is false?

Bacteria can be found in all three groups, i.e., among heterotrophs, autotrophs, and the decomposers.

Autotrophs comprise only those types that can use light energy; i.e, photosynthesize.

Carbon dioxide cycles between groups; e.g., heterotrophs produce it and autotrophs use it.

two of A, B,and  C  are false

none of A, B, C is false

A.

Bacteria can be found in all three groups, i.e., among heterotrophs, autotrophs, and the decomposers.

B.

Autotrophs comprise only those types that can use light energy; i.e, photosynthesize.

C.

Carbon dioxide cycles between groups; e.g., heterotrophs produce it and autotrophs use it.

D.

two of A, B,and  C  are false

E.

none of A, B, C is false

Explanation / Answer

Autotroph comprise of:

Thus, all statements are true, except (B).

Hence, right option is

Autotrophs comprise only those types that can use light energy; i.e, photosynthesize.

Photoautotrophs use sunlight as main source of energy Chemoautotrophs use inorganic substances as main source of energy.

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