Biology
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 photosynthesis.
(v) Draw a neat diagram of a chloroplast and label its parts.
Photosynthesis
ICSE 2014
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Answer
(i) The above experiment is conducted to show that Sunlight is necessary for photosynthesis.
(ii) The plant was placed in the dark before beginning the experiment to destarch the leaves.
(iii) The leaf was boiled in water to kill the cells and boiled in methylated spirit to remove chlorophyll.
(iv) Balanced chemical equation representing the process of photosynthesis is given below:
(v) Below is the labelled diagram of a chloroplast:
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