(a) What is photosynthesis?
(b) Write a chemical equation to show the process of photosynthesis in plants.
(c) Explain the mechanism of photosynthesis.
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(a) Photosynthesis is a process by which green plants use sunlight to make their own food. Photosynthesis requires sunlight, chlorophyll, water, and carbon dioxide gas as raw materials to prepare food.

(b) The reaction involved in Photosynthesis is:



(c) In green plants, photosynthesis occurs in the green plastids present in the leaves and other green parts of the plant called a chloroplast.


The raw materials for photosynthesis, namely carbon dioxide (enters through stomata) and water (absorbed from the soil by root hair) reach the leaves.
Sunlight is used to combine water and carbon dioxide to form glucose and oxygen. In this way, green plants convert solar energy into chemical energy by forming carbohydrates.
The major steps involved in photosynthesis are as follows:
  1. Absorption of sunlight energy by chlorophyll.
  2. Light energy is converted into chemical energy and water molecule splits into its constituent atoms, hydrogen, and oxygen.
  3. Carbon dioxide is reduced into its constituent sugars using chemical energy.


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Updated on: 27-Mar-2023

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