Question

The organisms that depend upon the food produced by autotrophs are called
A. Herbivores
B. Carnivores
C. Saprophytes
D. Heterotrophs

Answer 1

Hint: In presence of sunlight, producers prepare food for themselves.
They are called autotrophs. The living organisms which feed on the autotrophs can be herbivore, carnivore, or omnivore.

Complete answer: We know that the main source of energy is the sun i.e. solar energy. Solar energy is “fixed” by the green plants by the photosynthetic process. Upon receiving the photon, photosynthesis starts.
By this carbon dioxide and water react to form glucose and oxygen. This is how plants and some other photosynthetic organisms produce their own food. Hence, they are called producers.
There are two basic modes of nutrition: autotrophic and heterotrophic.
The living organisms which can prepare their own food with the help of sunlight (in the presence of chlorophyll) by photosynthesis are called autotrophs.
The organisms which consume the food prepared by autotrophs or eat the plants directly (or indirectly) are called heterotrophs.

So, the correct option is D. Heterotrophs.

Note: Heterotrophs may be further differentiated into the following groups: Herbivores, which directly consume food prepared by autotrophs; Carnivores, which feed on herbivore or other animals; Omnivores, which feed on both plants and animals.