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Give a brief description of the process of synthesis of food in green plants. - Science

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प्रश्न

Give a brief description of the process of synthesis of food in green plants.

संक्षेप में उत्तर

उत्तर

Photosynthesis is defined as the process in which chlorophyll-containing plant cells synthesize food in the form of carbohydrates using carbon dioxide and water in the presence of solar energy.

                     Photosynthesis

Sources of raw materials required for photosynthesis:

  1. Photosynthesis is the process by which green plants synthesize food, and it occurs mostly in their leaves.
  2. The leaves contain a green pigment known as chlorophyll. It aids plants in absorbing the energy of sunlight.
  3. This energy is needed to produce food from carbon dioxide and water. Chlorophyll, sunlight, carbon dioxide, and water all contribute to the photosynthetic process.
  4. The leaves absorb solar energy, which is stored in the plant as chemical energy.

Thus, photosynthesis can be represented by the following equation.

\[\ce{\underset{(Carbon dioxide)}{6CO2} + \underset{(Water)}{6H2O} ->[Sunlight][Chlorophyll] \underset{(Carbohydrates)}{C6H12O6} + \underset{(Oxygen)}{6O2}}\]

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अध्याय 1: Nutrition in Plants - Exercises [पृष्ठ ९]

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एनसीईआरटी Science [English] Class 7
अध्याय 1 Nutrition in Plants
Exercises | Q 4 | पृष्ठ ९

संबंधित प्रश्न

What are the necessary conditions for autotrophic nutrition?


All animals and fungi are autotrophs.


(a) Name the pigment in leaves which absorbs sunlight energy.
(b) What is the colour of this pigment?


Name the raw materials required for photosynthesis. How do plants obtain these raw materials?


The internal energy (cellular energy) reserve in autotrophs is:

(a) proteins
(b) fatty acids
(c) glycogen
(d) starch


Which of the following events does not occur in photosynthesis?

(a) conversion of light energy into chemical energy
(b) reduction of carbon dioxide to carbohydrates
(c) oxidation of carbon to carbon dioxide
(d) absorption of light energy by chlorophyll


Most of the plants absorb nitrogen in one of the following forms. This is:

(a) proteins
(b) nitrates and nitrites
(c) urea
(d) atmospheric nitrogen


Explain why, plants have low energy needs as compared to animals.


The Figure shown below represents an activity to prove the requirements for photosynthesis. During this activity, two healthy potted plants were kept in the dark for 72 hours. After 72 hours, KOH is kept in the watch glass in setup X and not in setup Y. Both these setups are air tight and have been kept in light for 6 hours. Then, Iodine Test is performed with one leaf from each of the two plants X and Y.

Which of the following steps can be followed for making the apparatus air tight?

  1. placing the plants on glass plate
  2. using a suction pump.
  3. applying aseline to seal the bottom of jar.
  4. creating vacuum

Name the following:

A plant that is partially autotrophic.


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