Question

3. How would you test the presence of starch in leaves?
4. Give a brief description of the process of synthesis of food in green plants. HELP. NCERT CLASS 7 SCIENCE CH 1 QUESTION.​

Answer 1

Answer:

Function with no argument and no return value.

Function with no argument but returns a value.

Function with argument but no return value.

Function with argument and returns a value.Function with no argument and no return value.

Function with no argument but returns a value.

Function with argument but no return value.

Function with argument and returns a value.Function with no argument and no return value.

Function with no argument but returns a value.

Function with argument but no return value.

Function with argument and returns a value.

Answer 2

Answer:

Answer 3. Presence of starch in leaves can be tested by iodine test. Iodine turns starch solution into blue-black colour. Pour few drops of dilute iodine solution on the boiled leaf. The leaf becomes blue-black which proves the presence of starch in it.

Answer 4. The process by which plants make food is photosynthesis. Photosynthesis is the process in which green plants use sunlight to make their own food. Photosynthesis requires sunlight, chlorophyll, water, and carbon dioxide gas. Chlorophyll is a substance in all green plants, especially in the leaves.

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