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 is harvested by the end of the same season. However, latter one if planted in spring, fail to flower or produce mature grains within a span of a flowering season. Explain why.
Winter varieties require an exposure to very cold temperature, a phenomenon, known as vernalisation; in the absence of this, plants do not flower or produce grains.
So they are sown in autumn; they germinate and remain as seedlings during winter.
They resume growth in spring and reproduce by the end of the season; they are harvested by mid-summer.