DDT as an Example of Biomagnification

Q. High concentration of DDT in birds causes disturbed metabolism of

1. Fe
2. Ca
3. Na
4. Mg

Q. The highest DDT concentration in aquatic food chain shall occur in

1. eel
2. phytoplankton
3. seagull
4. crab

Q. DDT residues are rapidly passed through the food chain causing biomagnification because DDT is

1. Lipid soluble
2. Moderately toxic
3. Non-toxic to aquatic animals
4. Water soluble

Q.

In a polluted environment, the concentration of pollutant would be maximum in

1. Tertiary consumers

2. Producers

3. Primary consumers

4. Secondary consumers

Q.
(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]

Q.

Substances which can be broken down into non-poisonous substances by the action of microorganisms are said to be

1. Non-biodegradable

2. Non-decomposable

3. Biodegradable

4. Non-degradable

Q. World Ozone Day is celebrated on

1. ${21}^{st}$ April
2. ${16}^{th}$ September
3. $5^{th}$ June
4. ${22}^{nd}$ April

Q. Regarding the assertion and reason, choose the correct option.
Assertion [A]: Methyl mercury is a highly persistent kind of pollutant that accumulates in food chains.
Reason [R]: Mercury pollution is responsible for Minamata disease.

1. Both the reason and assertion are false.
2. Both assertion and reason are true and the reason is the correct explanation for assertion.
3. Both reason and assertion are true but the reason is not the correct explanation of the assertion.
4. Assertion is true but the reason is false.

Q.

Assertion: Agricultural output increased several times after the introduction of DDT.

Reason: DDT was the first insecticide used on a wide scale.

Read the assertion and reason statements carefully and answer the question on the basis of the following options.

1. The assertion is true and the reason is also true; Reason is a correct explanation for Assertion.

2. The assertion is true and the reason is also true; Reason is NOT a correct explanation for Assertion.

3. The assertion is true but the reason is false.

4. The assertion is false but the reason is true.

Q. DDT residues are rapidly passed through food chain causing biomagnification because DDT is

1. liposoluble
2. moderately toxic
3. Non-toxic to aquatic animals
4. water soluble

Q. Which one of the following is not correct with regard to DDT?

1. Bacteria can undergo multiplication and DDT is degraded by living cells
2. Bacteria can be degraded by living cells and DDT cannot be degraded by living cells
3. Bacteria can undergo biological magnification and DDT can be degraded by living cells
4. bacteria can undergo biological magnification and DDT cannot be degraded by living cells

Q. The concentration of DDT has increased alarmingly in organisms today. But the highest concentration of DDT is seen in the tertiary consumers. This phenomenon is called ___.

Q. Population of birds decline significantly in an area where DDT has been used because:

1. birds stop laying eggs
2. eggs dont hatch
3. eggs are eaten by predators
4. birds can't make nests

Q.

What do you understand by DDT?

Q. Chemically, DDT is a

1. organochlorine compound
2. carbamate compound
3. organophosphate compound
4. triazine compound

Q. Minamata disease caused due to water pollution caused by

1. Lead poisoning
2. Arsenic chloride poisoning
3. Mercuric poisoning
4. Ammonia pollution

Q. The following table summarises the differences between biodegradable and non-biodegradable pollutants. Pick out the wrong differences and select the correct answer.

	Biodegradable pollutants	Non-biodegradable pollutants
(i)	These are the pollutants that can be easily degraded by micro-organisms.	These are the pollutants that can not be degraded into harmless materials.
(ii)	These can be used to produce energy (through biogas), compost, manure, etc.	These are difficult to manage as a natural method of degradation is absent.
(iii)	These usually do not enter biogeochemical cycles.	These become a part of rapid turnover in biogeochemical cycles.
(iv)	Examples: DDT, BHC, plastics, polyethylene, glass, etc.	Examples: Sewage, garbage, animal waste, etc.

1. (i) and (iv)
2. (ii) and (iv)
3. (iii) and (iv)
4. (ii), (iii) and (iv)

Q. Rachel Carson's famous book "Silent Spring" is related to

1. Population explosion.
2. Ecosystem management.
3. Pesticide pollution.
4. Noise pollution.

Q. Regarding the assertion and reason, choose the correct option.
Assertion [A]: Methyl mercury is a highly persistent kind of pollutant that accumulates in food chains.
Reason [R]: Mercury pollution is responsible for Minamata disease.

1. Both A and R are true and R is the correct explanation for A
2. Both A and R are true but R is not the correct explanation for A
3. A is true but R is false
4. Both A and R are false

Q. The Minamata disease in Japan was caused through pollution of water by

1. Lead
2. Mercury
3. Cyanide
4. Methyl isocyanate

Q. Minamata disease is caused due to presence of .......... in water.

1. Lead
2. Cadmium
3. Arsenic
4. Mercury

Q. Minamata disease is a pollution-related disease which results from

1. Release of human organic waste into drinking water
2. Accumulation of arsenic in atmosphere
3. Release of industrial waste mercury into fishing water
4. Oil spills into sea

Q. Minimata disease first occurred in

1. Japan
2. Russia
3. China
4. Korea

Q. Sewage, newspaper, styrofoam, hay.

Q. In an area where DDT had been used extensively, the population of birds reduced significantly because

1. Birds stopped laying eggs
2. Earthworms in the area got eradicated
3. Cobras were feeding exclusively on birds
4. Many of the birds' eggs laid, did not hatch

Q. Drinking of mineral water with very low level of pesticides (about 0.02 ppm) for long periods may

1. Produce immunity against mosquito.
2. Cause leukemia (blood cancer) in most people.
3. Cause cancer of the intestine.
4. Lead to accumulation of pesticide residues in body fat.

Q. The main causative agent of Minamata diseases atmospheric pollution by alkyl mercury which comes from

1. Piggery and poultry raised on open grasslands
2. Chimney waste of plastic industries
3. Water contaminated with effluents of vinyl industries
4. Exhaust emissions of automobiles

Q. Who said that population would exceed the food resources?

1. Oparin theory
2. Malthus theory
3. Darwin theory
4. Theory of Lamarck

Q. Which of the following metal is a water pollutant and causes sterility in human beings?

1. As
2. Mn
3. Mg
4. Hg

Q. Minamata disease is due to: