Environmental I...

Depletion of the Ozone layer in the stratosphere is caused by.

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

Which type of toxicity was experience by survivors of Nagasaki and Hiroshima?

Relation between DO and BOD is that they

Chemically, DDT is a

Accelerated eutrophication occurs due to?

Which of the following statement/s is/are correct with regard to ozone depletion:
1. The ozone hole is measured in terms of ozone concentrations, which is expressed in Dobson units.
2. The major cause for ozone depletion is the presence of CFCs in the stratosphere - CFCs are entirely man-made and not found naturally.

The first pesticide to be used commercially was

The given figures represent two devices A and B used to control air pollution. Identify them and select the correct answer.

Ozone layer of upper atmosphere is being destroyed by