Autotrophic mode of nutrition requires:

Carbon dioxide, Water, Chlorophyll and Sunlight

 The correct answer is Option (4) - Carbon dioxide, Water, Chlorophyll and Sunlight

Autotrophic mode of nutrition involves organisms that can produce their own food using simple inorganic substances. The primary process associated with autotrophic nutrition is photosynthesis. Here's a detailed explanation:

1. Carbon dioxide (CO2): Autotrophs, such as plants, algae, and some bacteria, take in carbon dioxide from the atmosphere.

2. Water (H2O): Plants absorb water from the soil through their roots.

3. Chlorophyll: Chlorophyll is a green pigment present in the chloroplasts of plant cells. It plays a crucial role in capturing light energy from the sun.

4. Sunlight: Sunlight is the energy source for the process of photosynthesis. Chlorophyll absorbs sunlight during the light-dependent reactions of photosynthesis.

This entire process enables autotrophic organisms to produce their own organic compounds (like glucose) using simple inorganic substances and sunlight. The released oxygen is a byproduct that is released into the atmosphere.