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CBSE Class 10 Answered

6. Write the events take place during photosynthesis. 7. How desert plants utilize CO2 during photosynthesis? 8. What are the functions of stomata? 9. How opening and closing of stomata is regulated?
Asked by rahmanfarseen | 03 Apr, 2018, 07:04: PM
answered-by-expert Expert Answer

6. Events during photosynthesis:

  • Absorption of sunlight energy by chlorophyll.
  • Conversion of light energy into chemical energy, and splitting of water into hydrogen and oxygen using light energy. 
  • Reduction of carbon dioxide by hydrogen to form carbohydrate like glucose by utilizing the chemical energy.

7. Desert plants have developed a process called Crassulacean acid metabolism, or CAM pathway due to the arid conditions of the environment. At night, the desert plants take in CO2 and convert it into an acid called malic acid. This acid is then broken down again into CO2 during the day allowing the plants to perform regular photosynthesis.

8. Functions of stomata:

  • Exchange of gases by taking carbon dioxide from the atmosphere and giving out oxygen that is used by human beings and animals.
  • Assist in photosynthesis and transpiration.

9. Opening and closing of stomata:

  • The opening and closing of stomata are controlled by the guard cells.
  • When water flows into the guard cells, they swell up and the curved surface causes the stomata to open.
  • When the guard cells lose water, they shrink and become flaccid and straight thus closing the stomata.
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