Biology
A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagrams and answer the questions.
(i) What aspect of photosynthesis is being tested in the above diagram?
(ii) Represent the process of photosynthesis in the form of a balanced equation.
(iii) Why was the plant kept in the dark before beginning the experiment?
(iv) What will be the result of the starch test performed on leaf 'A' shown in the diagram? Give an example of a plant with variegated leaves.
(v) Draw a neat labelled diagram of a chloroplast.
Photosynthesis
ICSE 2018
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Answer
(i) Chlorophyll is necessary for photosynthesis.
(ii) Balanced chemical equation representing the process of photosynthesis is given below:
(iii) The plant was kept in the dark to ensure that the leaves are free from starch.
(iv) After the starch test on leaf A, the green part of the leaf turns blue black and the pale yellow part will turn brown with iodine solution.
Example of plant with variegated leaves — Coleus, Geranium and Croton.
(v) Labelled diagram of a chloroplast is shown below:
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