11th Class Biology Plant Growth and Development / पौधे की वृद्धि और विकास

  • question_answer 33)
      In the figure of sigmoid growth curve given below, label segments 1, 2 and 3.                             

    Answer:

                    (i) Photosynthesis It is a totally light dependent process. Both quality and quantity affect the rate of the process resulting into total biomass accumulation by plants. (ii) Transpiration It is loss of water by plant surface. Presence of light increases the temperature, thus affecting the rate of transpiration in plants. (iii) Flowering The duration of light on plants effects the growth and development of plants, e.g., particularly flowering and this phenomenon is known as photo patriotism. On the basis of photoperiodic response day flowering plants are categorised as long day, short day and day neutral plants.


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