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DDT as an Example of Biomagnification

Fish-eating b...

Question

(a) What is the term used to describe the process shown above?
(b) What is the effect of DDT accumulation in birds?
(c) Mention one metal which also undergoes the above phenomenon. [1+1+1]

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Solution

(a) The process above shown is biomagnification. [1]

(b) High concentrations of DDT disturb calcium metabolism in birds which causes thinning of eggshell and their premature breaking, eventually causing decline in bird populations. [1]

(c) Mercury is a metal which undergoes biomagnification. [1]

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Q. 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 cadmium can cause thinning of eggshells in birds.
(iv) DDT accumulation is a major cause of a reduced population of fish-eating birds.
(v) Biomagnification occurs only in the aquatic food chain

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Q. If the concentration of DDT were 0.2 ppm in water of a lake. What would be its concentration in fish in the food chain plankton, fish, fish eating birds? How to calculate it?

Q. Identify the property of DDT which is responsible for the accumulation of DDT in the tissues of animals.

Q. In an agricultural farm, DDT was used to kill insects. Unfortunately, the amount of DDT used was very high and when there was rainfall, it was taken to the nearby lake along with the rainwater and got accumulated there. Given below is a food chain operating in this lake ecosystem:
Phytoplankton

\to

\to

\to

In which organism's body the concentration of DDT will be highest?

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DDT as an Example of Biomagnification

Standard XII Biology

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