BIO 102 | Study Mode

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Question 111
A
mountain
B
ocean
C
forest
D
desert.
Explanation
Of all the ecosystems, ocean is the largest and most stable ecosystem. Aquatic life is protected from vigorous climates and weather that are climatic conditions, problem of water supply, food, fire and artificial forces such as industrialization, farming and grazing are lacking in the oceans. The sea is continuous and not separated as land and freshwater habitats.

Correct option: B
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Question 112
A
carbon dioxide
B
chlorofluoro carbon
C
Freon
D
methane.
Explanation
Due to excessive combustion activity, the content of CO2 in the atmosphere has been steadily rising. CO2 is opaque to infra-red waves. Therefore, it allows the sunlight to fall on earth but checks the loss of heat during night. As carbon dioxide accumulates in the atmosphere it absorbs more and more of the reflected infrared radiation.

This could cause an increase in temperature referred to as the green house effect. Methane also causes green house effect but comparatively lesser than CO2. Chlorofluorocarbons and Freon cause depletion of ozone layers. Depletion of ozone layer leads to increase in incidence of skin cancer due to increased penetration of suns harmful rays.


Correct option: A
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Question 113
A
forest clearing after devastating fire
B
newly-exposed habitat with no record of earlier vegetation
C
freshly cleared crop field
D
pond, freshly filled with water after a dry phase.
Explanation
When succession begins on an area which has not been previously being occupied by a community e.g. a new exposed rock area, sand dunes, new islands, deltas, shore or recent lava flow, it is known as primary succession. The first group of organisms (plants or animals) which become established in such an area is termed the pioneer community.

Correct option: B
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Question 114
A
fluorine
B
boron
C
mercury
D
chlorine.
Explanation
Flourides are given out during refining of materials. Flourides cause flourosis. It is a disease which is defined by mottling of teeth, abnormal bones that are liable to fracture because fluorine replaces Ca2+ and makes the bones brittle. Flouride pollution is a serious problem in many districts of Rajasthan, where excess of flouride in water adversely affects the health of man. Many villagers have aged prematurely or became hunch backs.

Correct option: A
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Question 115
A
over-grazing
B
tourism
C
irrigated agriculture
D
all of these.
Explanation
Desertification means a process of spread of desert that occurs due to degradation of environment, cutting of trees, soil erosion etc. It can be natural or manmade. The main causes for desertification are over cultivation of poor soils, over grazing by animals, excessive cutting of fuel wood and inappropriate irrigation practises resulting in salinization. Among them overgrazing is the most important factor as it causes maximum effect.

Correct option: A
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Question 116
A
clones
B
sibling species
C
clines
D
denies.
Explanation
Clones are populations of genetically similar cells of individuals. Such a population is obtained either by mitosis or by asexual reproduction by parthenogenesis from a single plant. Clines are a morphological or genetic gradation of a species in a geographical area. Demes are a group of individuals which are capable of interbreeding. Siblings are the off springs of same male and female parents.

Correct option: C
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Question 117
A
are submerged in area
B
float on the sea surface
C
are deep dweller in sea
D
are floating (free) organisms.
Explanation
Benthoic organisms are attached or rest on the bottom sediments. Benthic animal may be divided into filter feeders, e.g. clams and deposit feeders e.g. snails.

Correct option: C
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Question 118
A
Russia
B
Japan
C
USA
D
Germany.
Explanation
Depletion in the concentration of ozone over a restricted area as spring time decline over Antartica is called ozone hole. Depletion of ozone is due to action of sunlight over pollutants which release chemicals (e.g., chlorine) that destroy ozone. The major are chloroflouroarbons (14% of total depletion), nitrogen oxides (3.5% deplection sulphur dioxide, halon, carbon tetrachloride, methyl chloroform, chlorine, etc. Major contributor of these gases is USA.

Correct option: C
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Question 119
A
habitat and specific functions of a species
B
specific place where an organism lives
C
specific species function and its competitive power
D
none of these.
Explanation
Niche is specific part of habitat occupied by individuals of a species which is circumscribed 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.


Correct option: A
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Question 120
A
Bhopal 1984, Ukrain 1986
B
Bhopal 1986, Russia 1988
C
Bhopal 1984, Ukrain 1990
D
Bhopal 1984, Ukrain 1988
Explanation
The Bhopal gas tragedy occurred on 3rd Dec. 1984 in which methyl isocyanate gas was released from a fertilizer manufacturing plant of Union Carbide causing death of approximately 2500 persons. Chernobyl disaster occurred on April 26, 1986, from an explosion at the chernobvl power station which released a huge radioactive cloud into the atmosphere in Ukrain.

Correct option: A

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