Match the following with correct response:

The correct answer is: 1-b, 2-d, 3-a, 4-c.

• Photosynthesis is the process by which autotrophs or green plants prepare their own food by using solar energy, water and carbon dioxide. The solar energy mediates the process where in water gets oxidized and carbon dioxide is reduced to sugars.
• The temperature of the earth's atmosphere is increasing and the phenomenon is called as green house effect. This effect is caused due to green house gases like carbon dioxide, methane, water vapor, etc. Chloro fluoro carbons emitted from cooling systems like refrigerators, air conditioners, etc cause green house effect.
• Ozone is the protective blanket present in the earth's atmosphere that absorbs the harmful UV from the sun. The thickness of ozone is getting reduced due to human activities, primarily air pollution.
• Acid rain occurs when the pH of the rain gets disturbed. Increased carbon dioxide level causes acid rain due to the dissolving of the gas in the water produces carbonic acid.
• The correct option is 1-b, 2-d, 3-a, 4-c.