BIO 102 | Study Mode

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Question 151
A
30%
B
60%
C
11%
D
22%.
Explanation
Land forms about 1/5 of the earths surface. About 36.6% of the land area is covered by houses factories, roads, desert etc. And about 30% by forests, and about 22% meadows and only 11% land area is fit for tilling.

Correct option: A
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Question 152
A
high temperature
B
pollution
C
radiation
D
low temperature.
Explanation
Pollution is any change in physical, chemical or biological charecteristics of the environment that has the potentiality to harm human life, life of other desirable species, natural resources, cultural assests and industries. Another type of pollution ;s increase in C02 and other greenhouse gases and a decrease in stratospheric ozone on global scale which would be affecting air, water and land resources, biological diversity and human health. Thus pollution results in damage to biological effectiveness.

Correct option: B
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Question 153
A
3.4 5.4
B
6.5 7.5
C
4.5 8.5
D
5.5 6.5.
Explanation
Soil nature is described in pH values. It can be alkaline, acidic or neutral. Highly acidic and highly saline soil often remain injurious for plant growth, micro organisms etc. Soil pH strongly affects the microbial activities. Neutral or slightly acidic soil (5.5 -6.5) remain best for growth of majority of plants.

Correct option: D
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Question 154
A
The amount of O2 utilized by organisms in water
B
The amount of O2 utilized by micro-organisms for decomposition
C
The total amount of P2 present in water
D
All of the above.
Explanation
Strength of sewage or degree of water pollution is measured in terms of BOD (Biochemical Oxygen Demand) value. BOD may be defined as, number of milligrams of O2 required for decomposition of one litre of waste or water by decomposing microorganisms (bacteria).

Correct option: B
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Question 155
A
10-20 dB
B
30-60 dB
C
70-90 dB
D
120-150 dB.
Explanation
Unit of sound level is decibel. As reference intensity, sound of noise level is taken as 100 dB. 10 dB is ten times the threshold intensity, 20 dB 100 times, 40 dB is 104,100 times the threshold intensity. Moderate conversation produces 60 dB sounds. Unwanted sound is noise and is therefore pollutant.

Correct option: B
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Question 156
A
monera and fungi
B
fungi and plants
C
protista and animalia
D
animalia and Monera.
Explanation
Microorganisms (bacteria and fungi) are decomposers of the ecosystem. They feed upon dead decaying living organisms (both plant and animals) and break them into simpler compounds. These are released free in the atmosphere and are utilized by producers for i the synthesis of their food materials. They mainly belong to monera and fungi.

Correct option: A
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Question 157
A
Hydrilla
B
water hyacinth
C
larva of stone fly
D
blue green algae.
Explanation
Stone fly (plecoptera order) larva requires well aerated, non polluted water. It is absent in polluted water.

Correct option: C
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Question 158
A
live in same niche
B
live in same habitat
C
interbreeding
D
live in different habitat.
Explanation
Species may be defined as the uniform interbreeding population of individuals which freely interbreed among themselves. Niche represents the habitat and functions of a species. Habitat is a specific place where an organisms lives.

Correct option: C
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Question 159
A
India
B
France
C
USA
D
Britain.
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 160
A
mutualism
B
commensalism
C
coperation
D
co-evolution.
Explanation
Co-evolution can occur in any interspecific relationship like symbiosis or mutualism. The relation between an entomophilous flower and pollinating insect shows co-evolved mutualism. In this the plant depends exclusively on the insect for pollination and the insect relies on the plant for food.

Correct option: D

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