BIO 102 | Study Mode

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Question 111
A
phosphorus-32
B
strontium-90
C
caesium-137
D
iodine-131.
Explanation
Strontium-90 is a long lived radionuclide. It tends to cycle like calcium.lt causes bone cancer, blood and tissue degeneration.

Correct option: B
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Question 112
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 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
parasitism intra-specific relationship
B
uricotelism aquatic habitat
C
excessive perspiration xeric adaptation
D
stream lined body aquatic adaptation.
Explanation
Streaming body is a secondary aquatic adaption. It is found in animals that live permanently in water but most of them are amphibious in nature. The stream lined body consists of compression of head, body and tail into a curved stream lined form.

There is no protruberance over the body so that the animal can move easily through water. Parasitism is a relationship between two organisms of different species in which one organism called parasite obtains its food directly from another living organism called host.

In xeric adaptation perspiration is reduced to conserve water. Uricotelism is characteristic of terrestrial animals which excrete uric acid.


Correct option: D
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Question 117
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 118
A
caused by combination of many gases
B
caused only by CO2
C
caused by CO2, CFC, CH4 and NO2 gases
D
none of these.
Explanation
Green house effect is warming effect found in green house by allowing solar radiations to pass in but preventing long range heat radiations to pass out. The gases which are transparent to solar radiation but retain and partially reflect back long wave heat radiations are called green house gases.

Recently the concentration of green house gases has started rising resulting in enhanced green house effect that is thus increasing the mean global temperature. It is called global warming. The various greenhouse gases are C02 (warming 60%), CH 4 (effect 20%), chloroflourocarbons or CFCs (1.4%) and nitrous oxide (N20, 6%). Others of minor significance are water vapours and ozone.


Correct option: C
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Question 119
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 120
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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