BIO 102 | Study Mode

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Question 101
A
above 80 dB
B
above 150 dB
C
above 30 dB
D
above 120 dB.
Explanation
Noise level are expressed on a logarithmic scale of decibels. The baseline noise levels in the community vary around 40 dB. International standards prescribe a maximum of 50 dB for day and 40 dB for night time in a residential area. Noise over 115 dB is regarded as highly avoidable. The World Health Organization (WHO) recommends an industrial noise limit of 75 dB.

Correct option: D
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Question 102
A
osteosclerosis
B
Hashimotos oxidase
C
Brights disease
D
minimata disease.
Explanation
Mercury gets changed to water soluble dim ethyl mercury which undergoes biomagnifications.

Eating poisoned animals causes deformity known as minamata disease (first reported in 1952 due to eating of fish captured from Hg-contaminated Minamata Bay of Japan) which is characterised by diarrhoea, hemolysis, impairment of various senses, numbness of lips, tongue, limbs, deafness, blurring of vision, mental derangement, meningitis and death.


Correct option: D
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Question 103
A
slightly decrease
B
remain unchanged
C
increase
D
decrease.
Explanation
BOD is biochemical oxygen demand which is the oxygen in mg required for 5 days in 1 litre of water at 20C for the micro-organisms to metabolize organic waste. Due to dumping of huge amount of sewage, the oxygen levels are depleted, which are reflected in terms of BOD values of water. With dumping of wastes number of microbes also increases tremendously and these also consume most of the oxygen, so BOD of the river will increase.

Correct option: C
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Question 104
A
mineral movement will be blocked
B
the rate of decomposition will be very high
C
energy flow will be blocked
D
herbivores will not receive solar energy.
Explanation
Decomposers are aprotrophs which decompose the organic remains by secreting extracellular digestive enzymes. They are also known as mineralisers as they release minerals trapped in organic remains. So in the absence of microorganisms the flow of mineral will stop.

Correct option: A
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Question 105
A
detritivores
B
herbivores
C
carnivores
D
omnivores.
Explanation
Consumers are heterotrophs, mostly animals which feed on other organisms. Herbivores feed on producers. This is because the herbivores obtain their food directly from plants. The carnivores which feed on herbivores are called as primary carnivores or second order consumers. The animals which feed on primary carnivores are called secondary carnivores. Omnivores eact both plants and animals therefore they are called third order consumers. Detrivores or scavengers are animals which feed on dead bodies of other organisms.

Correct option: B
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Question 106
A
relative density
B
regional density
C
absolute density
D
niche density.
Explanation
Niche is specific part of habitat occupied by individuals of a species which is circumsribed by its range of tolerance, range of movement, microclimate, type of food and its availability, shelter, type of predator, and timing of activity. A habitat has several ecological niches and supports a number of species. An ecological niche is used by a single species. Two or more species cannot use the same niche despite having a mutualistic association. The abundances of a species population within its habitat is called niche density.

Correct option: D
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Question 107
A
oxygen
B
hydrogen
C
chlorine
D
sulphur-dioxide.
Explanation
The Taj Mahal is built with white marble and is threatened by environmental pollution, especially due to sulphur dioxide. Sulphur dioxide is produced during combustion of fossil fuels, refining of petroleum and smelting of sulphur containing ores. Threat to Taj Mahal from Mathura refinery is due to pollutant gases composing SO2, H2S and nitrogen oxides. They would convert CaCO, (marble) into calcium sulphate and calcium nitrate.

Correct option: D
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Question 108
A
dogs
B
cats
C
pigs
D
rabbits.
Explanation
Minamata disease is caused because of eating of poisoned animals which contain water soluble dimethyl mercury which undergoes biomagnification. Thus animals which feed on marine animals (especially fish) and plants suffered from this disease, rabbits remained free from this disease because they feed on terrestrial plants.

Correct option: D
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Question 109
A
phosphorus and nitrogen
B
phosphorus and sulphur
C
oxygen and nitrogen
D
phosphorus and carbon dioxide.
Explanation
The term biogeochemical cycling is useful exchanges/circulation of biogeochemical nutrients between living and nonliving components of biosphere. In sedimentary cycle of matter, materials involved in circulation between biotic and biotic components of biosphere are nongaseous and the reservoir pool is lithosphere, e.g., phosphorus, calcium, magnesium. Sulphur has both sedimentary and gaseous phase. O2, N2 and CO2 do not have sedimentary phase but are gaseous cycle.

Correct option: B
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Question 110
A
200 times
B
1000 times
C
2 times
D
20 times.
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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