Autotrophic nutrition

Autotrophic nutrition can be defined as preparation of own food material with the help of sunlight. The living organisms which are preparing their own food are called autotrophic organisms. Best example of autotrophic organisms are Plants.

Plants have ability to produce their own food material with the help of sunlight and this process is called as photosynthesis. [Photo = Light, synthesis = to put together or produce ]. For formation of food in plants, they need adequate amount of sunlight, water and air [ Oxygen and Carbon dioxide ].

Photosynthesis is formation or synthesis of food in presence of light by the green tissues (green leaf) in plants.

Photosynthesis reaction can be carried out in following way :

Plant gets light energy from the sun that is received by chlorophyll which is present in leaf of the plant and using this light energy plants convert carbon dioxide and water into glucose (sugar) and as a by product oxygen formation takes place. Now the glucose will be used as energy to carry out the functions of the plant.

Steps of photosynthesis

  1. Absorption of sunlight (Light energy) by chlorophyll of the leaf.
  2. Conversion of light energy into chemical energy.
  3. Breakdown of water molecule and CO2 into glucose (sugar).
  4. Formation of O2 as a by product.

 

Question and answers :

1.) Define autotrophic nutrition along with example.

Answer :- Autotrophic nutrition can be defined as preparation of own food material with the help of sunlight. The living organisms which are preparing their own food are called autotrophic organisms.

2.) What is photosynthesis ?

Answer :- Photosynthesis is formation or synthesis of food in presence of light by the green tissues (green leaf) in plants.

3.) Write the steps of photosynthesis.

Answer :-1.) Absorption of sunlight (Light energy) by chlorophyll of the leaf.

2.) Conversion of light energy into chemical energy.

3.)  Breakdown of water molecule and CO2 into glucose (sugar).

4.)  Formation of O2 as a by product.

4.) Explain the reaction of photosynthesis?

Answer :-Plant gets light energy from the sun that is received by chlorophyll which is present in leaf of the plant and using this light energy plants convert carbon dioxide and water into glucose (sugar) and as a by product oxygen formation takes place. Now the glucose will be used as energy to carry out the functions of the plant.


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