Which of the following is an example of autotrophs?

Green plants

The correct answer is Option (4)- Green plants

Green plants are examples of autotrophs.

Explanation:

Autotrophs are organisms capable of producing their own food using energy from sunlight (photosynthesis) or inorganic compounds (chemosynthesis). Green plants are a classic example of autotrophs because they use sunlight to convert carbon dioxide and water into glucose (a form of stored energy) through the process of photosynthesis. These plants serve as the primary producers in ecosystems, providing energy for themselves and for organisms that consume them.

The other options—Protozoa, Animals, and Viruses—are examples of heterotrophs, as they rely on external sources for their nutrition. Heterotrophs obtain energy by consuming other organisms or organic compounds produced by autotrophs.