Mention any two conditions that enhance the chances of syngamy in organisms exhibiting external fertilization.
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The number of taxa exhibiting asexual reproduction is drastically reduced in the higher plants
Both angiosperms and vertebrates have a more complex structural organisation. They have evolved very efficient mechanism of sexual reproduction. Since asexual reproduction does not create new genetic pools in the...
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"Migration may enhance or blurr the effects of selection". Comment.
Migration can enhance the process of natural selection by bringing in the alleles and traits within a population that are selected by nature. Hence, providing advantage to a particular group. Migration can...
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"Migration may enhance or blurr the effects of selection"
Migration can enhance the process of natural selection by bringing in the alleles and traits within a population that are selected by nature. Hence, providing advantage to a particular group. Migration can blur the...
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Given below are a few statements related to external fertilization. Choose the correct statements.
(b) i and iii i. The male and female gametes are formed and released simultaneously iii. Water is the medium in a majority of organisms exhibiting external fertilization
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Double fertilization is (1) Fusion of two male gametes of a pollen tube with two different eggs (2) Fusion of one male gamete with two polar nuclei
(4) Syngamy and triple fusion
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Explain any two geographical conditions required for the cultivation of pulses. Name any two important pulses producing states.
Pulses are mostly grown in rotation with other crops because: (i) Pulses need less moisture and survive even in dry conditions. (ii) Being leguminous crops, all these crops help in restoring soil...
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Mention any two geographical conditions required for the growth of maize crop in India.
(i) Geographical conditions required {or the growth of maize crop in India: (a) It is a Kharif crop which requires a temperature between 21oC to 27oC. (b) It grows well in...
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Describe any four geographical conditions required for the growth of tea. Mention the two major tea producing states of South India.
Tea: Crows well in tropical and sub-tropical climates. Soil type: Deep and fertile, well-drained soil, rich in humus and organic matters. Climate: Warm and moist, frost-free climate throughout the year. Rainfall: Frequent showers...
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Suggest any five measures to enhance the agricultural production in India.
(i) Land reforms: Collectivisation, consolidation of holdings, cooperation and abolition of zamindari. (ii) Agricultural reforms: Green revolution and White revolution. (iii) Land development programmes: Provision for crop insurance against drought, flood, cyclone,...
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The lowest alkene which is capable of exhibiting geometrical isomerism : a) 1-Butene b) 2-Pentene c) 2-Butene d) 2,3-dimethylbutene
The lowest alkene which is capable of exhibiting geometrical isomerism is 2-Butene
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