Solved 2023 Question Paper ICSE Class 10 Biology — Question 25
Back to all questionsA potted plant with variegated leaves was kept in dark for 24 hours and then placed in bright sunlight. Answer the following questions.
(a) Which aspect of photosynthesis is being tested in the above diagram?
(b) Why was the plant kept in dark for 24 hours?
(c) After the starch test what will be the colour of the yellow and green parts of the leaf? Give reasons to support your answer.
(a) Presence of chlorophyll is necessary for photosynthesis.
(b) The plant is kept in dark for 24 hours to to destarch the leaves.
(c) After conducting the starch test, the green leaf portion turns blue, indicating starch presence, confirming photosynthesis due to chlorophyll. Non-green parts lack chlorophyll, don't photosynthesize, and show no starch-related colour change.