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Question
A destarched leaf of a potted plant is partially covered with black strip of paper on the upper
and lower surfaces as shown in the figure and kept in sunlight. The starch test was
performed after this. What will be the colour of the regions marked as A and B in the leaf ?
A destarched leaf of a potted plant is partially covered with black strip of paper on the upper
and lower surfaces as shown in the figure and kept in sunlight. The starch test was
performed after this. What will be the colour of the regions marked as A and B in the leaf ?
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Solution
The correct option is C A - pale, B - blue black
- Light is essential for photosynthesis to take place. As the partially covered part doesn't get light to carry out photosynthesis, no starch is produced in them. This part when tested with Iodine solution gives pale colour, which indicates absence of starch.
- The rest part of the Leaf which is not covered absorbs light and can perform photosynthesis. This part when tested with Iodine solution gives blue black colour, which indicates presence of starch.
Thus, "A" part is pale colour and "B" part is blue black colour.
Option "C" is correct.
- Light is essential for photosynthesis to take place. As the partially covered part doesn't get light to carry out photosynthesis, no starch is produced in them. This part when tested with Iodine solution gives pale colour, which indicates absence of starch.
- The rest part of the Leaf which is not covered absorbs light and can perform photosynthesis. This part when tested with Iodine solution gives blue black colour, which indicates presence of starch.
Thus, "A" part is pale colour and "B" part is blue black colour.
Option "C" is correct.
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