Class 7 Biology Respiration in Organisms Respiration in plants

Respiration in plants

  • Plants too require the phenomenon of respiration for survival.

  • They take in oxygen rich air from the atmosphere and breathe out air rich in carbon-dioxide through the tiny pores present in the lower surface of the leaves known as stomata.

  • Root hairs, lenticels, stomata are some of the parts present in plants for gaseous exchange.
  • The roots of plants too respire to generate energy but they follow a different method. They take up air rich in oxygen from air spaces between the soil particles.
  • The breathed in oxygen is supplied to the cells where it is used to break down glucose into carbon-dioxide and water.
  • By photosynthesis the plants produce glucose but the plants require energy to produce food.
  • This glucose is converted into ATP which is the energy currency. Energy is stored in the form of ATP.
  • This conversion of glucose to ATP requires respiration in the presence of oxygen.

  • Equation for breakdown of food to release energy in plants is as follows:

  • This energy is required by the plants for performing photosynthesis, excreting waste materials, for growth and development.
  • The rate of respiration in plants is lesser than animals. Because animals require to take up oxygen from the surrounding but in plants oxygen is released during photosynthesis. So less oxygen has to be taken from surrounding.


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