Requirements for Photosynthesis

Q. The non-green part of a variegated leaf, after the starch test, exhibits colour due to the absence of

1. brown
2. blue black
3. sunlight
4. chlorophyll

Q. Which chemical is used to test the presence of starch in the leaf?

Q.

84. How do plants and animals help each other in the exchange of gases in the atmosphere?

Q.

Which of these is a macronutrient used by plants?

1. Chlorine

2. Nitrogen

3. Copper

4. Zinc

Q.

Choose the correct answer from each of the four options given below:

A plant is kept in a dark cupboard for 48 hours before conducting any experiment on photosynthesis to

1. Remove starch from the plant

2. Ensure that starch is not translocated from the leaves

3. Remove chlorophyll from the leaf of the plant

4. Remove starch from experimental leaf.

Q. Assertion (A): Plants help to purify air by taking in carbon dioxide.

Reason (R): Carbon dioxide is used in photosynthesis.

1. A is true and R is false.
2. A is false and R is true.
3. Both A and R are true and R is the correct explanation for A.
4. A and R both are true but R is not the correct explanation for A.

Q.

Oxygen and water are the raw materials for photosynthesis.

1. True

2. False