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Question

Vernalization is a phenomenon which concerns

A
Low temperature requirement for flowering in plants
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B
Migration of birds from their winter homes to summer habitats
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C
Immunization of infants against the common infectious diseases
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D
Entering of cold blooded animals into an inactive state in winter
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Solution

The correct option is A Low temperature requirement for flowering in plants
Vernalization is the acquisition of a plant's ability to flower in the spring by exposure to the prolonged cold of winter, or by an artificial equivalent. Many plants grown in temperate climates require vernalization and must experience a period of low winter temperature to initiate or accelerate the flowering process. This ensures that reproductive development and seed production occurs in spring and summer, rather than in autumn.

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