NCERT Solutions for Class 7 Science Chapter 1
Important NCERT Questions
7th Chapter 1 Nutrition in Plants
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 4
Give a brief description of the process of synthesis of food in green plants.
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Leaves are the food factories of plants. The synthesis of food in plants occurs in leaves. Therefore, all the raw materials (Water, Carbon dioxide and sunlight) must reach there. Water and minerals are transported to the leaves by the vessels which run like pipes throughout the root, the stem, the branches and the leaves. The leaves have a green pigment called chlorophyll which helps leaves to capture the energy of the sunlight. This energy is used to synthesise (prepare) food from carbon dioxide and water.
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Plants make their food through a process called photosynthesis. Here’s how it works:
1. Sunlight: Plants use sunlight for energy. They have special parts called chloroplasts that capture sunlight.
2. Carbon Dioxide (CO2): Plants take in carbon dioxide from the air through tiny holes in their leaves called stomata.
3. Water: Plants absorb water from the soil through their roots.
4. Photosynthesis Steps: Sunlight helps the plant mix carbon dioxide and water in their leaves. This creates food, like glucose, for the plant.
5. Oxygen Release: Plants also make oxygen during this process, which they release into the air. This oxygen is what we breathe.
This process of photosynthesis is crucial for plants to grow and survive. It shows how they use sunlight, carbon dioxide, and water to create their own food and oxygen.