BIO 102 | Study Mode

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Question 181
A
colour change in chamaeleon
B
enlargement of body size by swallowing air in puffer fish
C
poison fangs in snakes
D
melanism in moths.
Explanation
Colour change in chameleon and melanism in moths are examples of camouflage in animals adapted to prevent predation from prey. As a defence mechanim puffers have the ability to inflate rapidly, filling their extremely elastic stomach with water (or air) until they are almost spherical. This prevents them from being identified by the predator. But poison fangs in snakes are a method adopted for preying and not escaping predation.

Correct option: C
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Question 182
A
fossil fuel burning release of CO2
B
nuclear power radioactive wastes
C
solar energy greenhouse effect
D
biomass burning release of CO2.
Explanation
Due to heavy industrilization and transportation (modernization), CO2 concentration is increasing day by day in the atmosphere. CO2 has capacity for absorbing heat radiations and thus increases temperature. This increase in global temperature (global warming) is mainly due to CO2 concentration is called green house effect. Complete combustion of fossil fuels and biomass releases carbon dioxide. Nuclear power plants releases radioactive wastes.

Correct option: C
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Question 183
A
Tundra
B
Savanna
C
prairie
D
coniferous forest
Explanation
A biome is a major terrestrial community characterized by a distinct climate and inhabited by a particular species of plants and animals. Tundra is characterized by precipitation of less than 25 cm annually. Permafrost or permanent ice is found about a meter down from the surface; it never melts and is impenetrable to both water and roots.

Savannahs are open grasslands with scattered shrubs and trees. Coniferous forest contains evergreen trees. In these forests all plants do not shed their leaves at the same time hence forest remains always evergreen. But pairies is grassland and epiphytes and ephemerals are found in deserts.


Correct option: C
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Question 184
A
a species which makes up only a small proportion of the total biomass of a community, yet has a huge impact communitys organization and s
B
a common species that has plenty of biomass yet has a fairly low impact on the community organization
C
a rare species that has minimal impact on the biomass and on other species in the community
D
a dominant species that constitutes a large proportion of the biomass and which affects many other species.
Explanation
Keystone species are those species which has significant and disproportionately large influence on the community structure and characteristics. It has often considerably low abundance and biomass as compared to dominant species. Removal of such species causes serious disruption in structure and function of community.

Correct option: A
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Question 185
A
secondary production
B
tertiary production
C
gross production (GP)
D
net production (NP)
Explanation
Productivity is rate of accumulation of energy containing organic matter by an ecosystem per unit area per unit time. It is of two types primary and secondary. Productivity at producers level is known as primary productivity. It is two types. Gross primary productivity is primary productivity including that amount which is utilized in respiration and other metabolic activities. Net primary productivity (NPP) is primary productivity in excess to that which is utilised in respiration and other metabolic activities.

Secondary productivity is productivity at consumers level. Since gross production includes total production including the amount utilized in respiration and other metabolic activities so it is more than other forms of productivity.

NP = GP Respiration


Correct option: C
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Question 186
A
reacted with DDT
B
reacted with ammonia
C
reacted with CO2
D
reacted with water.
Explanation
Bhopal gas tragedy occurred on 3 Dec. 1984 in a Union Carbide pesticide plant. When water and MIC mixed, an exothermic chemical reaction started, which produced a lot of heat. As a result, the safety valve of the tank burst because of the increase in pressure. This burst was so violent that even the concrete around the tank also broke.

The high moisture content (aerosol) in the discharge while evaporating gave rise to a heavy gas which rapidly sank to the ground. It caused several of the following ailments like partial or complete blindness, disorders like, gastrointestinal disorders in many surviving people.


Correct option: D
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Question 187
A
Laterite contains aluminium compound
B
Terra rosa most suitable for roses
C
Chernozems richest soil in the world
D
black soil rich in calcium carbonate.
Explanation
Black soil forms the largest group. It is developed mainly on the Deccan traps of Maharashtra, Madhya Pradesh and Kathiawar. Because of its hydrology and climatic conditions of the environment, the medium and deep black soils are very suitable for cotton cultivation. Laterite soil is rich in insoluble iron oxides and aluminium compounds, which gives laterites a reddish appearance. Chernozems are rich in nutrients (due to abundant organic rich compounds) and consequently the most fertile in the world.

Correct option: D
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Question 188
A
1992
B
1996
C
2000
D
2002
Explanation
The biological Act provides for conservation of biological diversity, sub stainable use of its components and fair and equitable sharing of the benefits arising out of the use of biological resources, knowledge and for matters connected there with or incidental there to. The biological act of India was passed in 2002. This act of parliament received the assent of President of India on the 5th February 2003.

Correct option: D
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Question 189
A
by tissue culture method
B
by creating biosphere reserve
C
by creating botanical garden
D
by developing seed bank.
Explanation
Biosphere reserves are multipurpose protected areas of different representative ecosystems which are meant for conservation of biodiversity or wild-life, traditional life tyle of tribals and their domesticated animals and also plant resources. Each biosphere reserve has a core zone (where no human activity is allowed), a buffer zone (with limited human activity) and manipulation zone (where human activity is allowed without degradation of ecology.

Thus the biosphere reserves protect not just wild varieties ies but also domesticated varieties of plants of an area.


Correct option: B
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Question 190
A
Aravalli hills
B
Western ghats
C
Indo-gangetic plain
D
Eastern ghats
Explanation
Hot-spot are areas with high density of biodiversity or megadiversity which are also the most threatened ones. Hot spots are determined by four factors, (i) Number of species/species diversity, (ii) Degree of endemism. (iii) Degree of threat to habitat due to its degradation and fragmentation (iv) Degree of exploitation. India has two hotspots-North-East Himalayas and Western Ghats.

Western Ghats occur along the western cost of India for a distance of about 1600 km in Maharashtra, Karnataka, Tamil Nadu and Kerala extending over to Srilanka.


Correct option: B

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