Our Environment...

The biological treatment of waste water makes use of

Biolouminescence is a feature exhibited by animals of

Which of the following pairs is mismatched?

During a presentation, Priya stated the following points.

(i) Decomposition of biodegradable wastes leads to foul smell.
(ii) Dumping of industrial wastes reduces the fertility of soil and leads to reduction in crop yields.
(iii) Breeding of flies in huge quantity carries germs and spreads diseases.
(iv) Dumping of waste into water bodiesleads to water pollution and is responsible for spreading of various water-borne diseases.

After her presentation, one of the students objected the correctness of the points stated by her followed by which, the teacher asked the topper of the class to comment.
According to you, which of the following statements is/are correct?

What is the name of the agreement made between countries to freeze CFC production?

Which statement is not true with respect to the ecological pyramid?

The excessive richness of nutrients in a lake or some other body of water, frequently due to run-off from the land, is called

Prolonged exposure to the fumes released by incomplete combustion of coal may cause death of a human because of