BIO 102 | Study Mode

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Question 131
A
insects
B
microorganisms
C
man
D
animals.
Explanation
Microorganisms (bacteria and mould) are decomposers of the ecosystem. They feed upon dead decaying organisms (both plant and animals) and break them into simpler compounds. These are released free in the atmosphere and are utilized by producers for the synthesis of their food materials. They are called natures scavengers as they are consumers of dead matter.

Correct option: B
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Question 132
A
aquatic
B
fossorial
C
diurnal
D
arboreal.
Explanation
In deserts animals prefer to live under the earths surface. Such animals are called fossorial. The animal residing either permanently or for most of life inside the burrows or under the earth surface are known as burrowing or fossorial animals and their mode of existence is described as subterranean or underground.

Correct option: B
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Question 133
A
O2 layer
B
O3 layer
C
CO2 layer
D
SO2 layer.
Explanation
Depletion of ozone is due to action of sunlight over pollutants which release chemicals (e.g., chlorine) that destroy ozone. Ozone depleting substances react with ozone present in the stratosphere and destroy the same. The major ODS are chloroflourocabons (14% of total depletion), nitrogen oxides (3.5% depletion sulphur dioxide, halon, carbon tetrachloride, methyl chloroform, chlorine, etc. Many of these are being released by jets flying in the stratosphere and rockets being fired into space.

Correct option: B
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Question 134
A
Azospirilluni
B
Escherichia
C
Biggiata
D
Chlorella.
Explanation
E. coli is the most common indicator of water pollution. It naturally occurs in the intestines of human beings and animals. They are commonly found in sewage and if E. coli is detected in water then it indicates fecal contamination. So if E. coli are detected in drinking water it indicates a serious health risk and that water-should not be used for drinking.

Correct option: B
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Question 135
A
higher than the present
B
dependent on the amount of oxygen in the atmosphere
C
same as present
D
less than the present.
Explanation
Carbon dioxide is one of the important green house gas. It allows the shorter wavelength of infra red radiations to pass through it but does not allow these radiations to leave the earths atmosphere. This results in warming of the atmosphere. If the amount of CO2 decreases then there will not be any increase in temperature.

Correct option: D
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Question 136
A
deciduous forests
B
evergreen forests
C
grass lands
D
thorn forests.
Explanation
Tropical shrubs or thorn forests are found in places where moisture conditions are intermediate between desert and savanna on one hand and seasonal or rain forests on the other hand. Acacia and Prosopis is non-succulent perennial plants and Capparis is a prophetic shrub.

Correct option: D
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Question 137
A
reacts with haemoglobin
B
makes nervous system inactive
C
it reacts with O2
D
it inhibits glycolysis.
Explanation
Carbon monoxide but are gaseous cycle is produced due to incomplete combustion, metallurgical operations and naturally by plants as well as animals. Carbon monoxide has 200 times more affinity within haemoglobin as compared to oxygen. Cabon monoxide combines with haemoglobin of blood and forms a stable compound called carboxyhaemoglobin. At 50 ppm, CO converts 7.5% of haemoglobin into carboxy-haemoglobin within 8 hours. It impairs oxygen transport resulting in headache, decreased vision, and cardiovascular malfunction and asphyxial.

Correct option: A
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Question 138
A
temperate forests
B
oceanic island communities
C
mangroves
D
tropical evergreen forests.
Explanation
Tropical forests are found in tropical zone of the world and are characterised by very high temperature with rainfall in abundance. The flora of tropical rain forest is very rich and highly diversified. The tropical 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 occurrence of suitable conditions in these forests. So these are more vulnerable to invasion by outside plants and animals.

Correct option: D
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Question 139
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 140
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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