AIPMT PRELIMS 2012 Zoology Ozone Depletion MCQ Question with Solution

Which one of the following is a wrong statement?

A

Eutrophication is a natural phenomenon in freshwater bodies

B

Most of the forests have been lost in tropical areas

C

Ozone in upper part of atmosphere is harmful to animals

D

Greenhouse effect is a natural phenomenon

Option C

Ozone in the upper atmosphere (stratosphere) is beneficial as it protects living organisms from harmful UV radiation. It is not harmful to animals.

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In sewage treatment, primary treatment basically involves physical removal of particles from the sewage through;

Which of the following is a secondary pollutant?

A river with an inflow of domestic sewage rich in organic waste may result in:

In which one of the following options the two examples are correctly matched with their particular type of immunity?

Which one of the following statements is correct with respect to immunity?

A certain gas takes three times as long to effuse out as helium. Its molecular mass will be: