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question_answer1)
A branch of science in which forest crop can be grown in desired pattern is
A)
Histology done
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B)
Horticulture done
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C)
Pisiculture done
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D)
Silviculture done
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question_answer2)
Which one of the following words has been used by Prof. R. Misra for ecosystem
A)
Biocoenosis done
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B)
Ecocosm done
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C)
Microcosm done
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D)
Biosystem done
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question_answer3)
Species which occupy a similar ecological niche in similar communities occupying different biogeographical regions are
A)
Ecotones done
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B)
Biomes done
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C)
Ecological equivalents done
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D)
Ecads done
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question_answer4)
Study of relationship between communities and environment is called [CPMT 1999; JIPMER 2001]
A)
Ethnology done
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B)
Ecology done
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C)
Synecology done
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D)
Autecology done
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question_answer5)
The closely related morphologically similar sympatric populations, but reproductively isolated, are designated as [CPMT 2000]
A)
Clines done
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B)
Demes done
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C)
Clones done
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D)
Sibling species done
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question_answer6)
The abundance of a species population within its habitat is called [AIIMS 2001, 02]
A)
Niche density done
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B)
Regional density done
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C)
Relative density done
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D)
Absolute density done
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question_answer7)
Which of the following statements is correct for species [Wardha 2005]
A)
The members of a species occupy the same habitat done
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B)
They are morphologically similar done
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C)
They can interbreed among themselves done
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D)
They cannot interbreed with members of the other species done
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question_answer8)
Which of the following is not true for a species [CBSE PMT 2005]
A)
Members of a species can interbreed done
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B)
Gene flow does not occur between the populations of a species done
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C)
Each species is reproductively isolated from every other species done
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D)
Variations occur among members of a species done
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question_answer9)
The side effects of heavy and constant grazing is that the
A)
Upper layer of the soil are loosened and are eroded done
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B)
Lower layer are made more compact and root respiration is interfered with done
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C)
Lower compact layer makes root penetration difficult done
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D)
All the above done
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question_answer10)
Maximum ozone concentration is
A)
One part per hundred done
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B)
One part per thousand done
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C)
One part per million done
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D)
One part per billion done
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question_answer11)
When young plants are grazed too heavily, they get killed because of
A)
Mechanical injury to roots done
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B)
Roots are starved done
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C)
Most of the aerial parts are eaten away done
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D)
Mechanical injury to the branches done
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question_answer12)
Good soil is [CPMT 1972, 78; MP PMT 1988]
A)
Which holds whole of water enters into it done
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B)
Which allows the limited amount of water into it done
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C)
Which allows to percolate the water slowly from it done
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D)
Which allows to pass water very quickly from it done
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question_answer13)
Plants are killed in winter by frost [BHU 1977]
A)
Because of desiccation and mechanical damage to the tissue done
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B)
Because no photosynthesis take place at such a low temperature done
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C)
Because respiration ceases at such low temp. done
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D)
Because there is no transpiration done
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question_answer14)
In recent years, there has been an increasing incidence of floods in the plains of northern India because [DPMT 1982, 83]
A)
There has been an increase in annual rainfall done
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B)
The rate of silting of dams has gone up done
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C)
There has been increased deforestation in the catchment areas done
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D)
Increased areas of land is being self-cultivated done
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question_answer15)
In the mountains, there is a lot of moisture and water and still the plants are xerophytes, because [CPMT 1985]
A)
Water turns into snow on mountains done
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B)
Water runs away due to the presence of slopes and cannot be used by plant (physiological dryness) done
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C)
Rocks of mountains cannot absorb water done
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D)
None of them is correct done
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question_answer16)
The major man made biotic factor is [CPMT 1986]
A)
Ploughing done
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B)
Grazing done
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C)
Fire done
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D)
Dairying done
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question_answer17)
Which of the following changes would be likely to make terrestrial life on this planet impossible [CPMT 1989]
A)
A decrease in mean temperature by \[10{}^\circ C\] done
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B)
Change in atmosphere permitting all the solar radiation reaching the upper atmosphere to penetrate to the surface of the earth done
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C)
Change in the orbit of the earth from an ellipse to a circle done
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D)
Disappearance of the moon done
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question_answer18)
The change of the lighter coloured variety of peppered moth Biston betularia to its darker variety (carbonaria) is due to [CBSE PMT 1995]
A)
Mutation of single Mendelian gene for survival in the smoke-laden industrial environment done
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B)
Deletion of a segment of gene due to industrial pollution done
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C)
Industrial carbon deposited on the wings of moth resulting in darker variety done
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D)
Translocation of a block of genes in chromosomes in response to heavy carbons done
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question_answer19)
At which latitude, heat gain through insolation approximately equals heat loss through terrestrial radiation [CBSE PMT 2005]
A)
\[22\frac{1}{2}{}^\circ \] North and South done
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B)
\[40{}^\circ \]North and South done
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C)
\[42\frac{1}{2}{}^\circ \]North and South done
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D)
\[66{}^\circ \]North and South done
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