set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

The process by which plants synthesize their food is called

a) Plasmolysis

b) Photosynthesis

c) Respiration

d) Osmosis

Question : 3

Photosynthesis occurs in

a) Only day

b) Day or night

c) Day and night

d) Night

Question : 4

Which light is most effective in photosynthesis?

a) Violet

b) Green

c) Blue

d) Red

Question : 5

The process by which plants produce food is called

a) Photosynthesis

b) Photosensitization

c) Metabolic synthesis

d) Carbohydrolysis

Question : 6

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