LIFE SCIENCE

Detailed explanation-1: -Certain archaebacteria like Methanogens too do not require Oxygen or sunlight for respiration and nutrition respectively.

Detailed explanation-2: -Plants, algae, and a group of bacteria called cyanobacteria are the only organisms capable of performing photosynthesis (Figure 1). Because they use light to manufacture their own food, they are called photoautotrophs (literally, “self-feeders using light”).

Detailed explanation-3: -Plants need sunlight to grow. Animals, including humans, need plants for food and the oxygen they produce. Without heat from the sun, Earth would freeze. There would be no winds, ocean currents, or clouds to transport water.