Environmental I...

Ozone in stratosphere extends

The stratospheric ozone depletion leads to?

Assertion : Agricultural output increased several times after introduction of DDT.

Reason : DDT was the first insecticide used on a wide scale.

Assertion :Presently, the global atmosphere is warming up.

Reason :The depletion of stratospheric ozone layer has resulted in increase in ultraviolet radiations reaching the earth. 

Biological Oxygen Demand (BOD) is a measure of

A large quantity of urban sewage is drained into nearby village river. Which among the given conditions would happen after mixing of sewage into the river?
(i) Biochemical oxygen demand (BOD) of receiving water body increases.
(ii) Dissolved oxygen of receiving water body decreases.
(iii) It will not cause mortality among fishes and other aquatic creatures.
(iv) It will lead to the nutrient enrichment of receiving water body. 

If biomedical waste is not handled properly, people are likely to be affected by

According to origin, identify the secondary air pollutant.

Which one is not dangerous for life and atmosphere?

Which of the following is not a greenhouse gas?