NCERT Science Notes for Class 7 (Part 2) 1.2- Photosynthesis- Food making process in Plants

Hello friends in this blog you are going to read about photosynthesis.

 

In the previous part you had read about-

1. What is nutrition?

2. Autotrophs and Heterotrophs

 Link for previous part-

https://allinoneguidematerial.blogspot.com/2020/10/ncert-science-notes-for-class-7-part-1.html

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In this article we are going to read about-

1. Functions and roles of different parts of plant in photosynthesis.

2. A detailed explanation of photosynthesis.

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1. As we know plants make their food by photosynthesis (photo=light and synthesis=to combine) and use some simple substances like Carbon-dioxide (CO₂), water (H₂O) and many mineralswhich are present in soil.

 

2. The roots absorb the water and minerals from soil and they are transported to leaves through stem.

 

3. The stem transports minerals and nutrients from the roots to the leaves by small pipes called vessels, in dessert plants photosynthesis is done by the stem.

 

4. The leaves have small pores in them; these are called stomata and are surrounded by guard cells. They take carbon-dioxide from air.

 

5. The cells of a leaf have a green pigment present in them, this green pigment is called chlorophyll, and it helps the leaves to capture Sun’s energy to make the food.

 

6. The word equation for photosynthesis is-

Carbon dioxide + Oxygen        _chlorophyll ^sunlight

= Carbohydrate + Oxygen.

 

7. If a plant’s leaves contain starch it indicates the occurrence of photosynthesis. Starch is also a type of carbohydrate.

 

Thanks for reading share this blog for more such informative articles.

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Upcoming parts- 

Part 3- 1.2- Photosynthesis- Food Making Process in Plants  (Part 2)

Part 4- Cells