Question

Match the Following:

Column 1	Column 2
Greenhouse gas	CO2
Nitrogen fixation	O3
Ozone	Rhizobium
Carbon cycle	Biogeochemical cycle

Answer 1

(A) Greenhouse gas (I) CO₂

1. The greenhouse gases are the gases present in the atmosphere of the earth that trap heat.
2. The primary greenhouse gas is carbon dioxide (CO₂).

(B) Nitrogen fixation (III) Rhizobium

1. Nitrogen fixation is the chemical process of converting the nitrogen molecule into ammonia.
2. The rhizobium is a bacterium present in the soil that helps in the nitrogen fixation.

(C) Ozone (II) O₃

1. The ozone is the layer around the surface of the earth that protects the earth from harmful rays coming from the sun.
2. The ozone is a highly reactive gas of three oxygen atoms (O₃).

(D) Carbon cycle (IV) Biogeochemical cycle

1. The carbon cycle is the cycle that exchanges carbon with the atmosphere of the Earth.
2. The carbon cycle is also known as the biogeochemical cycle.

Column I	Column II
(A) Greenhouse gas	(I) CO2
(B) Nitrogen fixation	(III) Rhizobium
(C) Ozone	(II) O3
(D) Carbon cycle	(IV) Biogeochemical cycle