Question

Which statement is not true for vernalisation ?
A
It prevents precocious reproductive development
B
It affects quantity and quality of flowering
It promotes flowering through a period of low temperature
D
Spring varieties of wheat require vernalisation

Answer 1

Answer:  The correct option must be "D"  Spring Varieties of wheat require vernalization.

Vernalization is the method of inducing flowering in plants by pre-treatment of their seeds at very low temperatures.

Explanation:

• Reason for Correct Option D:

1. The spring wheat is sown, and planted in spring, and is harvested by the end of the same season. During this period, this variety of wheat gets the desired exposure to low temperatures. Hence they don't need vernalization.
2. But if the winter variety of wheat is planted in spring; it fails to get the desired period of low temperature. As a result, these plants normally fail to flower or produce mature grain within a span of a flowering season. Hence, they are planted in autumn. They germinate, and over winter come out as small seedlings, resume growth in the spring, and are harvested usually around mid-summer.
3. But if the winter variety of wheat is planted in spring; it fails to get the desired period of low temperature. They remain vegetative during spring (warm period) but grow further to bear flowers and fruits after receiving low temperatures (in winter).

• Reasons for Incorrect Option A:

Precocious reproductive development in plants refers to the premature development of flowers and fruits. Vernalization prevents premature flowering of the plant in the growing season by inhibiting the development of reproductive organs and provides the plant with adequate time to fully mature.

• Reasons for Incorrect Option B:

Vernalization promotes flowering by first soaking the seed in water and is allowed to germinate. It is then given the low-temperature treatment for an appropriate period of time. It is dried and then sown later on.  Hence it increases the production yield and also the quality of flowering.

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