BIO 102 | Study Mode

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Question 81
A
mercury
B
cadmium
C
lead
D
copper.
Explanation
Lead is the most hazardous metal pollutants of automobile exhausts. Its effects are lead poisoning, anaemia, kidney disease and convulsions. It also affects central nervous system and distorts the red blood corpuscles.

Correct option: C
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Question 82
A
retain nutrients
B
hold organic materials
C
hold water
D
support life.
Explanation
Soil fertility is the characteristic of soil that supports abundant plant life. In particular the term is used to describe agricultural and garden soil.

Correct option: D
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Question 83
A
synthetic product
B
renewable resource
C
nonrenewable resource
D
inconvenient resource.
Explanation
A non-renewable resource is a natural resource that cannot be re-made, re-grown or regenerated on a scale comparative to its consumption. It exists in a fixed amount that is being renewed or is used up faster than it can be made by nature. Often fossil fuels, such as coal, petroleum, and natural gas are considered non-renewable resources, as they do not naturally re-form at a rate that makes the way we use them sustainable.

Correct option: C
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Question 84
A
biodegradable resources
B
renewable
C
non-renewable
D
renewable and nonrenewable resources.
Explanation
Metals and minerals are both renewable and non-renewable resources. Non renewable due to very long recycling in case of metals and some minerals but renewable due to shorter recycling in case of biogenetic nutrients.

Correct option: D
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Question 85
A
crop rotation
B
nitrogen fixing bacteria
C
decaying organic matter
D
intensive agriculture.
Explanation
Soil fertility is the characteristic of soil that supports abundant plant life. In particular the term is used to describe agricultural and garden soil. During intensive agriculture most of the nutrients and minerals are exhausted from the soil so fertility decreases.

Correct option: D
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Question 86
A
nondegradable nonmaintainabie
B
degradable maintainable
C
renewable
D
non-renewable.
Explanation
Water is a natural resource which get replenished, recycled or reproduced and should not used beyond its renewability. It is a major renewabk inorganic resource which is an essential component of living beings, a habitat for several organisms, determine of vegetation and climate, floods and droughts, requite; for drinking, bathing, washing, cooling, constructor worth disposal of sewage and industrial effluents irrigation eel.

Correct option: C
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Question 87
A
loamy soil
B
alluvial soil
C
laterite soil
D
sandy soil
Explanation
River water deposit alluvial soil. Alluvial soils are transported by water.

Correct option: B
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Question 88
A
more moisture
B
rich in organic matter
C
rich in iron, calcium and magnesium
D
recent formation.
Explanation
A fertile agricultural soil appears deep coloured at the surface as compared to soil one metre down. The reason for colour of top soil is rich in organic matter. The mineral component constitutes some 50-60% of soil. It is present in the form of particles of different sizes.

Correct option: B
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Question 89
A
texture
B
field capacity
C
water holding capacity
D
soil flora.
Explanation
Soil particles determines its textures. These particles enclose living spaces in between them call pore space. In coarse textured soils, the pore space is wide but pore frequency is low. But in fine textured soil, the pore space is narrow but pore frequency is high.

Correct option: A
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Question 90
A
fluorides
B
carbon monoxide
C
sulphur dioxide
D
ozone.
Explanation
Ozone is generated in the lower atmosphere during the formation of photochemical smog when nitrogen dioxide splits to produce reactive oxygen atoms which combine with molecular oxygen. Oxygen molecules split under ultraviolet radiations to produce oxygen atoms which combine with molecular oxygen to form ozone. It is this gas which forms the protective ozone umbrella in the stratosphere and shield life from biocidal high energy radiations. It can also damage DNA molecules and cause carcinogenesis.

Correct option: D

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