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Assertion: Biomagnification of DDT can e...

Assertion: Biomagnification of DDT can enhance the decline in bird population.
Reason: DDT causes thinning of egg shell and their premature breaking by disturbing calcium metabolism.

A

If both Assertion and Reason are true and the reason is the correct explanation of the assertion, then mark (1).

B

If both Assertion and Reason are true but the reason is not the correct explanation of the assertion, then mark (2).

C

If Assertion is true but Reason is false, then mark (3).

D

If both Assertion and Reason are false, then mark (4).

Text Solution

Verified by Experts

The correct Answer is:
A
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A : Biomagnification of DDt can enhance the decline in bird population. R : DDT causes thicking of egg shell and their delayed breaking by disturbing calcium metabolism.

Biomagnification of DDT caused decline in bird population by:

Biomagnification of DDT causes decline in bird population by:

How has DDT caused decline in bird population ?

Which of the following statements is incorrect about DDT I. DDT stands for dichlorodiphenyltrichloropropane and is an organochlorine insecticide . II. DDT is soluble in water but insoluble in organic solvents. III. High concentrations of DDT disturb calcium metabolism in birds, which causes thinning of eggshell and their premature breaking . IV. In fish - eating birds, the DDT can ultimately reach a very high level of 25 ppm.

DDT causes egg shell thinning in birds because it inhibits:

Which of the following statements is not correct regarding biomagnification ? (i) Mercury accumulated by an organism cannot be metabolised. (ii) In the process of biomagnification, concentration of DDT is increased at successive trophic levels. (iii) Accumulation of cadmimu can cause thinning of egg shell in birds. (iv) DDT accumulation is a major cause of reduced population of fish eating birds. (v) Biomagnification occurs only in aquatic food chain.

Assertion: The phenomenon of biomagnifIcation is well known for mercury and DDT. Reason: Mercury is a heavy metal.