Some varieties of wheat are known as spring Wheat While Others are called winter wheat. The former variety is sown and planted in spring, and it is harvested by the end of the same season. However, winter varieties; if planted in spring, fail to flower, or produce mature grains within a span of a flowering season. Explain, why?

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Ans.

Some plants require special extrinsic conditions in order to commence the flowering stage, and one of the requirements can be a low temperature.  Thus, the plants remain vegetative during the summer season and wait till they receive a low temperature to begin bearing flowers. To waiting for lower temperatures helps prevent precocious for early active reproductive development. This helps the plant to gain proper maturity and develop within the vegetative state before advancing to the reproductive stage. This is called the vernalisation. Some plants have separate spring and winter varieties. For example, the spring wheat is planted in the spring season and come to flower and fruit right at the end of the season, but if the winter varieties are sown in the same season, then it will not bear flowers and fruits as compared to the spring variety.

Instead, the winter is planted in the autumn, and during the winter they form the seedlings. The seedlings resume their growth in the spring season and bear flowers during the summer. The winter wheat requires specific low temperatures to begin sprouting and maturing.

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