Question

Choose the correct answer from the four options kept in the dark cupboard for about 48 hours, before conducting any experiment on photosynthesis to

• A. remove chlorophyll from the leaves
• B. remove starch from the plant
• C. ensure that no photosynthesis occurs
• D. ensure that the leaves are free from starch

Answer 1

The correct option is B

remove starch from the plant

The correct option is D:

Explanation of the correct option:

1. When the plant is kept in dark, the process of photosynthesis does not takes place because of the absence of light.
2. Photosynthesis produces carbohydrates which are stored in the form of starch in plants.
3. Without the absence of photosynthesis, all the starch is consumed leaving the leaves starchless.
4. The process is known as destarching.

Explanation of the incorrect options:

Option A:

1. To remove chlorophyll from the leaves, they are boiled in water to kill the cells and then boiled in alcohol to remove chlorophyll.

Option B:

1. To remove starch from the plant, it is kept in the dark for 1 to 2 days.

Option C:

1. The photosynthesis process occurs only in the presence of sunlight.

Final answer: The plant was kept in dark before conducting any experiment on photosynthesis to remove starch from the plant.