Question

: Match List I with List II.

	List I		List II
A.	Greenhouse effect	1.	Respiration
B.	Oxygen	2.	Keeping food items fresh
C.	Nitrogen	3.	Nitric acid and sulphuric acid
D.	Acid rain	4.	Carbon dioxide

A. A-4, B-1, C-2, D-3
B. A-1, B-2, C-3, D-4
C. A-2, B-3, C-4, D-1
D. A-3, B-2, C-1, D-4

Answer 1

Hint: To answer we should know the greenhouse effect, respiration, acid rain. Some gases of the environment trap the radiation of the sun and reflect in the atmosphere, so increase the temperature of the atmosphere. The inert gas is used for keeping the good fresh. Respiration is the inhalation of the gas produced by plants. The acids cause the acidic rain.

Complete step-by-step answer:The warming of the planet's surface due to the reflection of sunlight by gases is known as the greenhouse effect. The gases causing the warming are known as greenhouse gases. So, carbon dioxide causes a greenhouse effect.
Respiration is a biochemical process. As we inhale oxygen it reacts with glucose. The reaction produces carbon dioxide, water, and energy. The carbon dioxide is exhaled out. The reaction is shown as follows:
${{\text{C}}_{\text{6}}}{{\text{H}}_{{\text{12}}}}{{\text{O}}_{\text{6}}}\,{\text{ + }}\,6{{\text{O}}_{\text{2}}}\, \to \,{\text{6}}\,{\text{C}}{{\text{O}}_{\text{2}}}\,{\text{ + }}\,{\text{6}}\,{{\text{H}}_{\text{2}}}{\text{O}}\,{\text{ + ATP}}$
 So, oxygen is used in respiration.
Nitrogen is a chemically inert gas. It does not react with food. So, keep its freshness. Nitrogen prevents the food from microbial growth.
So, nitrogen is used for keeping food fresh.Acid rain is simple rain containing a high amount of sulphur and nitrogen acids.
So, acid rain is caused by nitric acid and sulphuric acid.
So, the correct matching of list I with list II is,

	List I		List II
A.	Greenhouse effect	4.	Carbon dioxide
B.	Oxygen	1.	Respiration
C.	Nitrogen	2.	Keeping food items fresh
D.	Acid rain	3.	Nitric acid and sulphuric acid

Therefore, option (A) A-4, B-1, C-2, D-3, is correct.

Note: The methane, carbon dioxide water, and ozone are known as greenhouse gases. Carbon dioxide is the exhalation product of respiration. The oxides of sulphur and nitrogen emitted in the environment react with water in the environment and form acids that cause acid rain. Oxygen cannot be used for food packing because oxygen can cause the oxidation of food.