| Sunlight is available as a source of energy. The sunlight is very much important in |
| a) | Chemosynthesis | b) | Photosynthesis |
| c) | Heterotrophic mode of nutrition | d) | All of the above |
| (b)Light is essential for photosynthesis. The amount of photosynthesis depends upon the quality, intensity and duration of light. Photosynthetic yield is maximum on equator and tropical areas |