Question

Why is light necessary for photosynthesis?

Answer 1

Photosynthesis is a process that plants and other organisms utilise to transform light energy into chemical energy that can then be released to power the organism's activities through cellular respiration.

Complete answer:
Photosynthesis is the transformation of light energy into chemical energy. Carbohydrates like sugars are made from carbon dioxide and water with the help of light energy.
Photosynthesis is derived from the Greek words photo, which means "light," and synthesis, which means "bringing together." As a waste product, oxygen is also emitted. Light is a critical component of photosynthesis, and we must demonstrate that light is required for photosynthesis in this experiment.
The importance of light colour in photosynthesis
Are you aware that light colour has a significant impact on photosynthesis? It certainly does. Only particular colours of light are used by plants in the photosynthesis process. Blue, red, and violet light rays are absorbed by chlorophyll. Photosynthesis happens more frequently in blue and red light rays than in green light rays, which occur less frequently or not at all.
Blue light is the light that is best absorbed, hence it exhibits the highest rate of photosynthesis, followed by red light. The plant can't absorb green light, thus it can't be used for photosynthesis. Chlorophyll appears green because it absorbs red and blue light, rendering them invisible to our sight. The green light that is not absorbed reaches our eyes and causes the chlorophyll to look green.

Note:
Polluted Atmosphere: Pollutants and gases (impure carbon) land on leaves and obstruct the stomata, making carbon dioxide absorption harder. The rate of photosynthesis can be reduced by 15% in a polluted environment.