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8. A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.
8. A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.
Biology | Class 10 | ICSE | Photosynthesis | Selina
8. A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.

(a) What aspect of photosynthesis was being tested?

(b) Why was the plant placed in the dark before beginning the experiment?

(c) During the starch test, why was the leaf

   (1) boiled in water

   (2) boiled in methylated spirit

(d)Write a balanced chemical equation to represent the process of photosynthesis. 

(e) Draw a neat diagram of a chloroplast and label its parts. 

Solution _

  • What aspect of photosynthesis was being tested?

Effect of sunlight on the rate of photosynthesis.

  • Why was the plant placed in the dark before beginning the experiment?

To remove the starch from the leaves .

  • During the starch test, why was the leaf
  • boiled in water

to kill the cells

  • boiled in methylated spirit

to remove chlorophyll

        ( d) Write a balanced chemical equation to represent the process of photosynthesis. 

  • Draw a neat diagram of a chloroplast and label its parts. 
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