BIO 102 | Study Mode

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Question 171
A
shrub land
B
forest
C
desert
D
grassland.
Explanation
Deserts are places where the diurnal temperatures vary greatly. It is extremely hot during the day time and very cold at night. This change in temperature also affects the temperature condition of the soil.

Correct option: C
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Question 172
A
acidity
B
aridity
C
salinity
D
metal toxicity.
Explanation
Irrigation induced salinity can arise as a result of the use of any irrigation water, irrigation of saline water etc. combined with inadequate leaching. Since all surface and ground water contains salts to varying degrees, irrigation is often seen as the primary culprit for bringing salts into the field.

Correct option: C
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Question 173
A
Allens law
B
Gauses hypothesis
C
Dollos rule
D
Weismans theory.
Explanation
Interspecific competition is rivalry amongst members of different species. The severity of competition depends upon similarity in the requirement of food and shelter. Every type of organism has a particular niche; no two organisms can live in same niche. One of the two is eliminated. This phenomenon is called Gause hypothesis of competitive exclusion. Different organisms develop different types of variations in order to exploit niches, e.g. 14 species of Finches in Galapagos Islands.

Allens law states that there is tendency of smaller extremities like ear, nose, tail etc in animals living in colder climate.

Weismans germplasm theory was the ultimate blow-to discards lamarckism.

Dollos law proposed that evolution is irreversible.


Correct option: B
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Question 174
A
mutualism
B
commensalism
C
co-operation
D
co-evolution
Explanation
Co evolution may be defined as, evolution in two species that interact extensively with one another so that each acts as a major force of natural selection on the other. When two species or two populations of a single species interact extensively, each exerts strong selective pressures on the other. When one evolves a new feature or modifies an old one, the other generally evolves new adaptations in response.

This constant, mutual feedback between two species is called co evolution. Animal-pollinated flowers must attract useful pollinators and frustrate undesirable visitors eating nectar or pollen without fertilizing the flower in return. The animals, in turn, have been under selective pressures to locate flowers quickly and identify the flowers that can provide them with sufficient nutrition in terms of nectar or pollen with minimum expenditure of energy. So that the entomophilous flower and the insects have coevolved.


Correct option: D
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Question 175
A
high fertility, low or rapidly fall rate, rapid population growth and age distribution
B
high fertility, high density, mortality rate and a very young age
C
high infant mortality, low fertility population growth and a very distribution
D
high mortality, high density, uneven growth and a very old age distribution.
Explanation
In developing countries the conditions are becoming better for survival of human beings. So the mortality rate or the number of individuals dying per unit of time is low.

Mortality or the average number of individuals produced by a population in a unit of time is high. So that there is rapid population growth and there are more individuals in the pre-reproductive age group. So there is young age distribution.


Correct option: A
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Question 176
A
chlorine
B
ozone
C
chloramine
D
phenyl.
Explanation
In a sewage efficient treatment plant (CETP) during the tertiary treatment the decreased water is chlorinated with chlorine or perchlorate salts, ozonised or irradiate with UV to kill pathogens. Phenyl is not used for disinfection of drinking water.

Correct option: D
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Question 177
A
members of a species can interbreed
B
gene flow does not occur between the populations of a species
C
each species is reproductively isolated from every other species
D
variations occur among members of a species.
Explanation
Species may be defined as an uniform interbreeding population or group of individuals which freely interbreed among themselves. Gene flow occurs between populations of a species by gene migration i.e., emigration and immigration.

Correct option: B
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Question 178
A
Basal convention Biodiversity conservation
B
Kyoto protocol Climatic change
C
Montreal protocol Global warming
D
Ramsar convention Ground water pollution
Explanation
Kyoto protocol occurred in Dec 1997. International conference held in Kyoto, Japan obtained comments from different countries for reducing overall greenhouse gas emissions at a level 5% below 1990 level by 2008-2012.

Correct option: B
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Question 179
A
polar ice
B
glaciers and mountains
C
Antartica
D
Greenland.
Explanation
Nearly about 97% of the earths water is saline in the oceans and seas. 3% of the earths water is locked up on the polar ice caps. 85% of the frozen freshwater is in the Antarctic is ice cap, 15% of the frozen freshwater is in the northern polar ice cap and glaciers.

Correct option: A
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Question 180
A
22 1/2 North and South
B
40 North and South
C
42 1/2 North and South
D
66 North and South.
Explanation
Earth does not receive equal radiation at all points. The east west rotation of earth provides equal exposure to sunlight but latitude and dispersion do affect the amount of radiation received. The poles receive far less radiation than equator. This uneven heating is called differential insulation. At 40 North and South, approximately the heat gain is equal to heat loss through terrestrial radiation.

Correct option: B

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