BIO 102 | Study Mode

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Question 141
A
net secondary productivity
B
gross primary productivity
C
net primary productivity
D
gross secondary productivity.
Explanation
Gross primary productivity is the total energy stored in the food materials synthesized by the green plants or total rate of photosynthesis including the organic matter used up in the respiration during total photosynthesis or total assimilation.

Correct option: B
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Question 142
A
cyanide
B
methyl isocyanate
C
lead
D
mercury.
Explanation
Mercury is changed to water soluble dim ethyl mercury which undergoes biomagnification. Eating poisoned animals causes deformity known as minamata disease (first reported in 1952 due to eating of fish captured from Hg-contaminated minimata Bay of Japan) which is characterised by diarrhoea, hemolysis, impairment of various senses, numbness of lips, tounge, limbs, deafness, blurring of vision, mental dearrangement, meningitis and death.

Correct option: D
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Question 143
A
not a pollutant
B
an antibiotic
C
a non-degradable pollutant
D
a biodegradable pollutant.
Explanation
DDT (dichloro diphenyl trichloroethane) is a non-biodegradable pesticide. It is persistent, fat soluble and shows biomagnification. So they are more harmful to higher tropic level organisms.

Correct option: C
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Question 144
A
top carnivores
B
primary producers
C
herbivores
D
carnivores.
Explanation
DDT is fat soluble and persistent pesticide that shows biomagnification. It means that its concentration increase at each trophic level of food chain. Therefore top carnivores will have more concentration of toxic materials in their body.

Correct option: A
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Question 145
A
silicosis
B
pneumonicosis
C
fluorosis
D
leprosis.
Explanation
Flourides are given out during refining of metals. Flourides cause flourosis. This is a pollution Telated dissorder. When the level of flouride content in drinking water becomes as high as 3 to 12 mg/L, the water becomes polluted. It affects teeth as well as bones.

Correct option: C
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Question 146
A
10%
B
20%
C
1%
D
2%.
Explanation
Energy flow in an ecosystem is always unidirectional. Only 10% of the gross productivity of producers is entrapped by herbivores for their body building. Herbivores are eaten by carnivores. Only 10% of the herbivore productivity is utilized for raising productivity of primary carnivores. The rest is consumed in ingestion, respiration, maintance of body heat and other activities. Higher carnivores similarly are able to retain only 10% of energy present in primary carnivores. This is called the 10% law. It was given by Lindemann in 1942.

Correct option: A
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Question 147
A
potassium isocyanate
B
methyl isocyanate
C
sodium monoxide
D
none of these.
Explanation
Bhopal gas tragedy occurred on 3 Dec 1984 in which a storage tank containing 36 tonnes of methyl isocyanate (MIC) burst in pesticide manufacturing plant of Union Carbide in Bhopal. MIC is one of the deadliest toxins which when inhaled even in very small dose can kill the animal. It is highly irritating to skin, eyes or mucus membrane and causes death by lung oedema. It is also a carcinogenic agent.

Correct option: B
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Question 148
A
PAN
B
aerosol
C
CO
D
CO2
Explanation
Secondary pollutant is formed from a primary one through change or reaction. The secondary pollutants are more toxic than primary ones. Nitrogen oxides and hydrocarbons react photocheniically to produce peroxyacyl nitrates and ozone. Peroxyacyl nitrates are produced due to photochemical reactions between nitrogen oxides and unsaturated hydrocarbons.

Correct option: A
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Question 149
A
deciduous forests
B
tropical rain forests
C
grasslands
D
savannahs.
Explanation
Trophical forests are found in trophical zone of the world and are characterised by very high temperature with rainfall in abundance. The flora of trophical rain forest is very rich and highly diversified. The trophical forests have a very rich fauna both in density as well as in varieties. The reason for this high diversity and variety of flora and fauna is the occurence of suitable conditions in these forests.

Correct option: B
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Question 150
A
zooplanktons
B
phytoplanktons
C
fishes
D
birds.
Explanation
Pesticides sprayed over crops also pass into water bodies due to surface run-off. In excess they cause immediate and mass scale deaths of aquatic animals. Persistant pesticides (e.g. organ chlorine or chlorinated hydrocarbons like DDT) pass into food chain and increase in amount per unit weight of organisms with the rise in trophic level due to their accumulation in fat.

The phenomenon is called biomagnification. e.g. 0.01-0.05 parts per billion in water, 25 parts per billion or 0.025 ppm in phytoplankton, 0.123 ppm in zooplankton, 1.04 ppm in clams and small fish, 4.83 ppm in predator fish and 124 ppm in fish eating birds like Sea Gulls. So the maximum biomagnification occurs in fishes in case of aquatic ecosystem.


Correct option: C

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