The energy intensive process consisting of combustion in absence of oxygen is known as
A. Hydrolysis
B. Pyrolysis
C. Glycolysis
D. None of the above
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Isopentenyl adenine, a species of cytokinin, differs from zeatin in that
A. A methyl greup is present at the third carbon position in place of the hydroxyl group
B. An ethyl group is present at the third carbon position in place of the hydroxyl group
C. A hydroxyl group is present at the third carbon position in place of the methyl group
D. A methyl group is present at the third carbon position in place of the aldehyde group
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The differences between the absolute humidity and relative humidity expresses the
A. Biological oxygen demand
B. Absolute deficit of the temperature
C. Saturation deficit of the air
D. All of the above
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The gibberellin compounds that have been isolated from Pisum sativum include
A. GA17 , GA38 , GA39 , GA40
B. GA17 , GA38 , GA9 , GA20
C. GA9 , GA38 , GA20 , GA40
D. GA17 , GA38 , GA9 , GA40
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The measure of the efficiency of a process induced by light of different wavelengths but of the same intensity is known as
A. Absorption spectrum
B. Action spectrum
C. Wave spectrum
D. None of the above
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Which of the following antibiotics is used to control blast of rice?
A. Agricimicin
B. Blasticidin
C. Streptomycin
D. Penicillin
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The Embden-Myerhof-Pamas (EMP) pathway is also referred to as
A. Hexose monophosphate shunt
B. Non-cyclic photophosphorylation
C. Glycolate pathway
D. Hexose diphosphate pathway
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The effect of the two superimposed beams of light on the rate of photosynthesis exceeds the sum effect of both beams of light used separately. This photosynthetic enhancement is referred to as
A. Hill's reaction
B. Emerson effect
C. Photosystem effect
D. Spectrum effect
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Which of the following free-floating hydrophytes possesses only one root?
A. Nymphaea
B. Spirodela
C. Lemna
D. Wolffia
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Which of the following plants is a common insectivorous plant found in India?
A. Rafflesia
B. Morinda
C. Eucalyptus
D. Nepenthes
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The photoperiod in plants is perceived at
A. meristem
B. flower
C. floral buds
D. leaves
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Water is a dipolar substance in that
A. Both hydrogen pole and oxygen pole are positively charged
B. Both hydrogen pole and oxygen pole are negatively charged
C. The hydrogen pole is negatively charged and the oxygen pole is positively charged
D. The hydrogen pole is positively charged and the oxygen pole is negatively charged
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Which of the following are known to be the single largest cause of elevated terrestrial temperatures from the greenhouse effect, accounting for approximately one-half of the problem?
A. Emissions of carbon dioxide
B. Nitrous oxides
C. Chlorofluorocarbons
D. Low-level ozone
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Which of the following diseases is popularly known as tikka disease?
A. Citrus canker
B. Red rot of sugarcane
C. Leaf spot disease of groundnut
D. Tobacco mosaic
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The reducing power generated in the bacteroids is transferred to the nitrogen fixing membrane via
A. Ferrodoxin and haemoglobin
B. Coenzyme A and haemoglobin
C. Cytochrome and ferrodoxin
D. Cytochrome and haemoglobin
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The minimum quantity of any factor that produces a precipitable effect on the organism is known as
A. Threshold
B. Factor interaction
C. Limiting factor
D. None of the above
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The first concrete evidence of nitrogen fixation by blue-green algae came from the work of
A. Drewes in 1928
B. Fritsch in 1945
C. Stewart in 1963
D. Fogg in 1952
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The most abundant enzyme in the living world is
A. RuBisCO
B. invertase
C. DNAse
D. zymase
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Which of the following groups of elements are trace elements?
A. Cobalt, sodium, nitrogen
B. Nitrogen, sulphur, phosphorus
C. Cobalt, copper, manganese
D. Copper, manganese, magnesium
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In most fruits, due to ethylene, the rate of respiration will undergo a sharp rise and then fall near the end of ripening which is known as
A. Metabolic rise
B. Climacteric rise
C. Conditional rise
D. Physiological rise
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