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Note on Photosynthesis

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Photosynthesis is the necessary process for the life process of animals and plants. Green plants prepare their food by themselves. Green plants make their food in the presence of CO2, water, and sunlight. The food prepared by the green plant is called carbohydrate and process of making food are called photosynthesis. Green plants take carbon dioxide from the atmosphere absorbs water from the soil through roots and trap solar energy to manufacture their food carbohydrate.

The whole process can be summarized as

Carbon dioxide + Water → Glucose + Oxygen

6CO2 + 6H2O → C6H12O6 + 6O2

During photosynthesis, oxygen is given out. Since green plant makes their food by themselves, they are also called autotrophs.

Essential raw materials for photosynthesis

  1. Carbon dioxide (CO2)

    The main source of this gas is the atmosphere, which consists 0.03% of 0.04% of the atmosphere. Water plants take CO2 dissolved in water. During respiration, CO2 is released by animals and plants. Plants are capable of utilizing this CO2, in addition to atmospheric CO2 for the purpose of making their food. During daytime, when light is available, plants fix the CO2 in photosynthesis.

  2. Water (H2O)

    Plants absorb water from the soil by their root hairs. This water is then transported up to the stem and leaves through the xylem. Along with water, many minerals dissolved in water are also absorbed by the plants. Water plants absorb water through their general surface.

  3. Chlorophyll

    Chlorophyll is the photosynthetic apparatus in which photosynthesis occurs. They are located in green parts of a plant particularly in the chloroplast of a leaf. This chlorophyll is present in small bodies called chloroplasts which help to trap solar energy and converts into chemical energy. The green leaves of plants are photosynthetic organs of plants. Only those cells are able to carry out photosynthesis which has chloroplasts.

  4. Light

    Light is very important for photosynthesis. In photosynthesis, the light energy changed into potential chemical energy. Sun is the only main natural source of light energy. Artificial light is also effective in photosynthesis, but this light should be intensive. Only green plants are capable of utilizing this light energy.

    The rate of photosynthesis is affected both by quality as well as the quantity of light. In red color of light, the rate of photosynthesis is maximum and in light of green color, there is no photosynthesis

Significance of Photosynthesis

  1. It is the important source of energy for all living organisms, both producers and consumers. It is essential for sustaining life.
  2. It helps in the growth and development of plants.
  3. It is necessary for the synthesis of many organic compounds used by man and other animals.
  4. It converts atmospheric CO2 back to oxygen.

  • Photosynthesis is necessary process for the life process of animals and plants. Green plants prepare their food by themselves.
  • The whole process of Photosynthesise summarized as:
  • Carbon dioxide + Water -----> Glucose + Oxygen
  • 6CO2 + 6H2O -----> C6H12O6 + 6O2
.

Very Short Questions

The process of making food in the leaves with the help of water and carbon dioxide in the presence of sunlight and chlorophyll is called photosynthesis.

In photosynthesis solar energy is converted into chemical energy.

Carbohydrate is formed in photosynthesis.

The significance of photosynthesis are:

  1. It is the important source of energy for all living organisms- both producers and consumers. It is essential for sustaining life.
  2. It helps in the growth and development of plants.
  3. It is necessary for the synthesis of many organic compounds used by man and other animals.
  4. It converts atmospheric CO2 back to oxygen.

The main source of carbon dioxide gas is the atmosphere, which consists 0.03% to 0.04% of the atmosphere. Water plants take CO2 dissolved in water. During respiration, CO2 is released by animals and plants. Plants are capable of utilizing this CO2, in addition to atmospheric CO2 for the purpose of making their food. During daytime, when light is available, plants fix the CO2 in photosynthesis.

Light is very important for photosynthesis. In photosynthesis, the light energy changed into potential chemical energy. Sun is the only main natural source of light energy. Artificial light is also effective in photosynthesis, but this light should be intensive. Only green plants are capable of utilizing this light energy.

The rate of photosynthesis is affected both by quality as well as the quantity of light. In the red color of light, the rate of photosynthesis is maximum and in light of green color, there is no photosynthesis. In this way, light is essential for photosynthesis.

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  • The food prepared by green plants is called ______.

    vitamin


    minerals


    protein


    carbohydrate


  • The process of making food by green plants in the presence of carbon dioxide, water and sunlight is called ______.

    Karyokinesis


    Cytokinesis


    photosynthesis


    Dikinesis


  • Photosynthesis helps to convert atmospheric carbon dioxide into ______.

    krypton


    nitrogen


    oxygen


    hydrogen


  • Chlorophyll helps to convert solar energy into ______.

    potential eneygy


    chemical energy


    magnetic energy


    mehanical energy


  • The food prepared by the green plant is called ______.

    chloroplast


    chlorophyll


    carbohydrate


    photosynthesis


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Tej

What are other colours of light used for artificial photosynthesis?


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shivam parliwal

what is xylem.


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dolraj

what is the relationship between respiration and digestion with circulation of blood ?


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