NUTRITION IN PLANTS (Part - 1), Class 7

NUTRITION IN PLANTS


Q.1. What is Nutrition?

Ans. The process of taking food by an organism as well as the utilization of this food by the organism is called Nutrition.

 Q.2. What are Nutrients?

Ans. Nutrients are the components of food which are necessary for organism's body. These components are basically carbohydrates, proteins, fats, vitamins and minerals.

Q.3. What are modes of Nutrition?

Ans. The methods of obtaining food are called modes of Nutrition. On the basis of their modes of Nutrition, all the organisms can be divided into two main groups:

  • Autotroph following Autotrophic (auto = self; trophos = nourishment) mode of Nutrition 
  • Heterotroph following Heterotrophic (heteros = other; trophos = nourishment) mode of Nutrition

Q.4. Differentiate between Autotrophic and Heterotrophic modes of Nutrition.

Ans.4. 


Q.5. What is Photosynthesis?

Ans. The process by which green plants make their own food (like glucose) from carbon dioxide and water by using sunlight energy (in the presence of chlorophyll) is called photosynthesis.
Leaves are the food factories of a plant.


 Q.6. Draw a diagram showing the process of Photosynthesis.

Ans. 


Q.7. Write the main events involved in the process of Photosynthesis.
Ans. The main events involved in the process of Photosynthesis are:

—  Absorption of light energy by chlorophyll.

—  Conversion of light energy into chemical energy + splitting (breaking) of water into hydrogen and oxygen.

—  Reduction of CO2 to carbohydrates (means this energy is then used to combine hydrogen atoms with carbon dioxide to form carbohydrates).

 


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