Q241
Open questionAll algae and cells of higher plants carry out photosynthesis in ordered, membrane bound structures called chloroplasts with the exception of
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Biology GK · all questionsPlant Anatomy and Physiology
Plant Anatomy and Physiology
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Q242
Open questionThe major photosynthetic pigments in plants are
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Q243
Open questionNutrient solutions are added to the solid culture by means of
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Q244
Open questionDuring germination of seeds the activity of enzymes
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Q245
Open questionBiochemical oxygen demand or BOD is a test of the amount of oxygen needed for bacteria to break down the organic matter in a water sample over a period of
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Q246
Open questionWhich of the following parts of abscisic acid is responsible for the occurrence of two enantiomorphic forms, (R)-abscisic acid and (S)-abscisic acid?
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Q247
Open questionThe first evidence that bacterial microorganisms can fix molecular nitrogen came from the work of
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Q248
Open questionAtmospheric sulphur dioxide, soluble in water, is carried back to earth in rainwater as
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Q249
Open questionThe predator chain among different food chains include
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Q250
Open questionAscent of sap in plants takes place through
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Q251
Open questionConsider the following statements and choose the correct answer:
1. The effects of biotic factors include interactions amongst plants growing in a community, between plants and animals including man and between plants and soil-microorganisms
2. In a densly populated area, one of the most important types of biotic factors influencing vegetation is due to man's multifarious activities - this is noted in farming operations
3. Change or destruction of vegetation by fire is a direct biotic effect due to man's activities
4. In many cases different plant groups, plants and bacteria live in mutual benefit - this is called symbiosis in which each partner derives some benefit from the other
1. The effects of biotic factors include interactions amongst plants growing in a community, between plants and animals including man and between plants and soil-microorganisms
2. In a densly populated area, one of the most important types of biotic factors influencing vegetation is due to man's multifarious activities - this is noted in farming operations
3. Change or destruction of vegetation by fire is a direct biotic effect due to man's activities
4. In many cases different plant groups, plants and bacteria live in mutual benefit - this is called symbiosis in which each partner derives some benefit from the other
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Q252
Open questionThe leaves of Ficus religiosa are provided with drip tips to adapt for
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Q253
Open questionLighter rainfall, where rainfall is heavy during summer but low during winter, is responsible for the formation of
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Q254
Open questionConsider the following statements and choose the correct answer:
1. The density of water varies inversely with temperature
2. The density of water varies inversely with the concentration of dissolved substances
3. Water is more dense at approximately 4° C and becomes progressively less dense as it is cooled below +4° C
4. When great evaporation occurs in a lake having no outlet, the lake may come to contain a higher percentage of salts than the ocear
1. The density of water varies inversely with temperature
2. The density of water varies inversely with the concentration of dissolved substances
3. Water is more dense at approximately 4° C and becomes progressively less dense as it is cooled below +4° C
4. When great evaporation occurs in a lake having no outlet, the lake may come to contain a higher percentage of salts than the ocear
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Q255
Open questionAccording to Maximov (1929),
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Q256
Open questionMolybdenum deficiency affects the activity of
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Q257
Open questionThe property by which an enzyme can act on only one organic group is known as
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Q258
Open questionWhich of the following compounds acts as a source of electrons for purple sulphur bacteria?
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Q259
Open questionThe phenomenon of similar but unrelated species in different geographical areas is called
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Q260
Open questionThe amount by which respiration is increased over normal or ground respiration by the transfer of a plant or tissue from water to a salt solution is known as
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