NCERT Class 4 Science: How do Plants Make Food Complete Notes

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Key Notes –

1. We need food to provide us energy. This energy is used by our body to do work and also for our growth.

2. Plants also need energy to grow and bear fruits and flowers.

3. Plants are the primary producer.

4. Plants are the only living beings that can prepare their own food using energy from the sun. This process is called photosynthesis.

5. Photosynthesis comes from two words –

What is photosynthesis

What is Photosynthesis

What is photosynthesis

6. Photosynthesis takes place in the leaves which contain Chlorophyll. The leaves appear green due to the presence of chlorophyll.

7. There are lines running all over the leaf. These lines are called veins.

Leaf

Leaf

Leaf

8. Using a lens, we can observe some small openings in the back side of a leaf. These openings are called stomata.

Stomata

Stomata

Stomata

9. The root of the plant absorbs water from the soil and the stem then sends it to the leaves. The veins on the leaf take water from the stem and pass it to all parts of the leaf.

10. Stomata take in air and give our air. During photosynthesis, plants take in carbon dioxide and gives out oxygen.

11. The leaf uses the energy of sunlight and changes water and carbon-dioxide into a kind of sugar which is the food.

Photosynthesis

Photosynthesis

Photosynthesis

12. The plant uses this sugar or food to grow, make flowers, fruits and seeds and to repair damaged cells.

13. The left out sugar is then converted into starch and stored in fruits, seeds, leaves, root and stems and becomes the food that is eaten by all animals including us.

13. The left out sugar is then converted into starch and stored in fruits, seeds, leaves, root and stems and becomes the food that is eaten by all animals including us.

14. Presence of starch in a leaf can be tested using iodine solution. Iodine turns a leaf blue black.

15. Coloured leaves of some plants are able to prepare food because pigments present in the leaves give them a different colour but chlorophyll is present in such leaves.

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