DENDROLOGY

Detailed explanation-1: -To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight.

Detailed explanation-2: -Carbon dioxide and water are the main raw materials for the process of photosynthesis. Besides, light energy and chlorophyll are also raw materials for photosynthesis. Sunlight is the energy source, which is essential for photosynthesis to take place.

Detailed explanation-3: -Carbon Dioxide (CO2)-Plants obtain CO2 from the atmosphere via stomata. Water-Plants take water from the earth and transmit it to their leaves via their roots. Sunlight is the only source of light that the chlorophyll and other green elements of the plant absorb.

Detailed explanation-4: -Photosynthesis in plants is of 3 steps, occurring in chloroplast: Absorption of light, Conversion of light energy into chemical energy and splitting of water molecules, Carbon dioxide is reduced to carbohydrates.