Question

Match the column.

Column I	Column II
a) DDT	i) Carbon dioxide
b) PAN	ii) Smog
c) Acid rain	iii) Biological magnification
d) Global warming	iv) Sulfur dioxide

(a) a-iv, b-iii, c-ii, d-i
(b) a-I, b-iii, c-ii, d-iv
(c) a-ii, b-iii, c-iv, d-i
(d) a-iii, b-ii, c-iv, d-i

Answer 1

Hint: Any accumulation of a toxin, such as pesticides, in the tissues of resistant species at successively higher levels in the food chain, is biomagnification, also known as bioamplification or biological magnification.

Complete answer:
Biological magnification is the mechanism of increasingly concentrated chemical toxin transfer while going up the food chain, e.g., DDT, mercury.
As secondary contaminants, things like ozone, aldehydes, and peroxyacetyl nitrates (PAN) are named. Photochemical smog shapes the combination of these main and secondary contaminants.
The key contaminants are sulfur dioxide and nitrogen oxides, which cause acid precipitation.
Emissions of sulfur oxide and nitrous oxide released into the air react to form acids that fall down to Earth with water vapor and other chemicals.
The primary greenhouse gas produced by human operations is carbon dioxide. The carbon cycle is changed by human activity, both by adding more carbon dioxide to the environment and by affecting the ability of natural sinks to extract carbon dioxide from the atmosphere, such as forests.

Additional information:
Di-chloro, di-phenyl trichloroethane generally referred to as DDT, is an organochlorine, a colorless, tasteless, and nearly odorless crystalline chemical compound. It was initially created as an insecticide and became notorious for its effects on the environment. In 1874, the Austrian chemist Othmar Zeidler first synthesized DDT.
Peroxyacetyl nitrate is a nitrate-containing peroxyacetyl. It is found in photochemical smog as a secondary pollutant. Thermally unstable, it decomposes into radicals of peroxy ethanoyl and nitrogen dioxide gas. It is a lachrymatory material, which means the lungs and eyes are irritated.
Acid rain, or acid deposition, is a broad term that includes any type of acid component precipitation, such as sulfuric or nitric acid, which, in wet or dry forms, falls from the atmosphere to the ground. This can involve acidic rain, snow, fog, hail, or even dust.
Global warming is the long-term warming observed since the pre-industrial era (between 1850 and 1900) of the Earth's climate system due to human activities, mainly fossil fuel burning, which raises the amount of heat-trapping greenhouse gases in the atmosphere of the Earth.

So, the correct answer 'a-iii, b-ii, c-iv, d-i'.

Note:
Electricity and heat generation (25 percent of global greenhouse gas emissions in 2010): The largest single source of global greenhouse gas emissions is the burning of coal, natural gas, and oil for electricity and heat. Human health has been greatly impacted by air pollution, wildfires, and heat waves caused by global warming, and in 2007, the World Health Organisation reported that 150,000 people were killed annually by climate-change-related problems.