set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up or dries because

a) Roots do not receive oxygen for respiration

b) Tree is infected by the soil microbes

c) Roots are starved of energy

d) Water from soil cannot rise to aerial parts

Question : 2

Which one of the following does not increase the amount of carbon dioxide in carbon cycle on earth?

a) Volcanic action

b) Decay of organic matter

c) Photosynthesis

d) Respiration

Question : 3

The process by which plants synthesize their food is called

a) Plasmolysis

b) Photosynthesis

c) Respiration

d) Osmosis

Question : 4

The process by which plants produce food is called

a) Photosynthesis

b) Photosensitization

c) Metabolic synthesis

d) Carbohydrolysis

Question : 5

Which one of the following is the process involved in photosynthesis?

a) Oxygen is taken and carbon dioxide and water vapour are given out

b) Food is oxidized to release carbon dioxide and water

c) Free energy is converted into potential energy and stored

d) Potential energy is released to form free energy

Question : 6

The most active light for photosynthesis is

a) Green light

b) Blue light

c) Red light

d) Violet light