Question

A natural phenomenon that becomes harmful due to pollution is-
A. Global warming
B. Ecological balance
C. Green-house effect
D. Desertification

Answer 1

Hint: Air pollution is common as due to increase in engagement of population in the world it is quite obvious that pollution will increase. A natural phenomenon which is affected by pollution can be several. Due to pollution only green-house effect is affected. The radiation passing through it becomes more dangerous when pollution is present. It changes the temperature more.

Complete answer-
Let's discuss options given in the question.
Option A Global warming- global warming is the heating of earth surface due to increase in industrial activities and fossil fuel burning and increase in greenhouse levels.
Option A is not the correct answer.
Option B Ecological balance- the balance of nature is known as ecological balance. Usually, equilibrium in homeostasis is to say that then can have a point of balance if the feedback is negative.
Option B is not the correct answer.
Option C Green-house effect- green-house effect is due to increase in pollution by which sun rays warms the planet atmosphere and carbon-dioxide and other gases increases.
Option C is the correct answer.
Option D Desertification- desertification refers to the degradation of ecosystems and lands by climatic changes and human activities.
Option D is not the correct answer.

Hence, Option C is the correct answer.

Note:
Greenhouse gases include- water vapor, methane, chlorofluorocarbons and energy absorbed from the earth atmosphere. These gases trap the harmful radiation coming from the sun and help to lower the radiation harmful effects. The diseases caused by the sun's harmful rays will be- skin diseases, lymphoma, eye’s diseases. Prolonged duration of UV rays can permanently damage health.