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.
(i) What aspect of photosynthesis was being tested?
(ii) Why was the plant placed in the dark before beginning the experiment?
(iii) During the starch test why was the leaf: (1) boiled in water (2) boiled in methylated spirit.
(iv) Write a balanced chemical equation to represent the process of the photosynthesis.
(v) Draw a neat diagram of a chloroplast and label its parts.

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Solution

(i) Sunlight is necessary for photosynthesis.
(ii) The plant was placed in the dark for destarching of leaf.
(iii) (1) To kill the cells of the leaf (2) To remove the chlorophyll
(iv) $6 C O_{2} + 12 H_{2} O S u n l i g h t - ------ \to C h l o r o p h y l l C_{6} H_{12} O_{6} + 6 H_{2} O + 6 O_{2}$
(v) (ref. image)

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A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept it in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with dark paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.

(a) What aspect of photosynthesis was being investigated ?

(b) Is there any control in this experiment ? If so, state it.

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(i) Sunlight is necessary for photosynthesis.(ii) The plant was placed in the dark for destarching of leaf.(iii) (1) To kill the cells of the leaf (2) To remove the chlorophyll(iv) 6CO2+12H2OSunlight−−−−−−−→ChlorophyllC6H12O6+6H2O+6O2(v) (ref. image)