NEET Biology: Environmental Science questions with solutions

Q1. Assertion The concentration of pollutants in water or atmosphere is often expressed in terms of ppm. Reason Concentration in parts per million can be expressed as mass to mass, volume to volume and mass to volume

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Answer: Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

The assertion is true because pollutants in water and air are usually present in very small amounts, so ppm is a convenient unit. The reason is also true, and it explains the assertion: ppm can be written as mass/mass, volume/volume, or mass/volume, making it broadly applicable to different kinds of mixtures.

Q2. Air pollution is caused by:

1. human.
2. nature.
3. both nature and man.
4. forestation.

Answer: both nature and man.

Air pollution can come from natural sources like wildfires, dust storms, and volcanic eruptions, as well as human activities such as vehicle emissions and industrial smoke. Since both contribute, the correct choice is both nature and man.