Question

Which of the following are true regarding $C{O}_2$?

a. Excess of $C{O}_2$ acts as a pollutant.

b. Plants take in $C{O}_2$ for photosynthesis.

c. Deforestation leads to a decrease in the amount of $C{O}_2$ in the air.

d. Less quantity of $C{O}_2$ causes a rise in temperature.

• A. a and b
• B. a, b and d
• C. a, b and c
• D. b and c

Answer 1

The correct option is A

a and b

The correct statements regarding $C{O}_2$ are as follows:

i. Excess of $C{O}_2$ acts as a pollutant because $C{O}_2$ is a greenhouse gas which causes global warming.

ii. Plants take in $C{O}_2$ in the daytime for photosynthesis to produce food.

iii. Deforestation means less availability of trees. Hence, less intake of $C{O}_2$ for photosynthesis. This leads to an increase in the amount of $C{O}_2$ in the air.

iv.$C{O}_2$ traps heat resulting in an increase in the average temperature of Earth.