Study the given aquatic food chain and answer the questions that follow:

(i) Give reasons why there is a continuous increase in the DDT content in different trophic levels of the chain.
(ii) Name the phenomenon responsible for the increase in DDT content.

2

(a)

During last few decades, most products are being sold in secure ‘consumer friendly’packages .
a) Should this be encouraged?
b) How are modern packaging techniques turning into a major environmental threat?
c) Give some examples where such packaging can be easily avoided.

2

(a)

Why are grains and vegetables produced in organic farms supposed to be better for human consumption than those produced in farms where chemical fertilizers, pesticides etc. has been used?

2

(a)

(a) What will happen if electrode wires are not maintained at several thousand volts?
(b) The velocity of air is high

2

(a)

In a survey it is observed that the population of fish-eating birds living on the bank of lake is continuously declining, where DDT is regularly sprayed to check mosquitoes.
i) What could be the reason behind this?
ii) Name the phenomenon involved.

2

(a)

What in your opinion is more polluted and why – Domestic sewage or ndustrial effluents/waste from a agricultural field containing fertilizes and pesticides?

2

(a)

Why was Eichhornia introduced into India? What is the consequence of its introduction?

2

(a)

List some of the waste which is generated at home. Which of them can you avoid or reduce easily?

2

(a)

Suppose your father is planning to set up a factory.
(i) What measures would you suggest to him to provide protection against noise pollution.
(ii) Mention two harmful effects of noise pollution

2

(a)

Is global warming real, only a theory or speculation?

2

(a)