Some varieties of wheat are known as spring wheat while others are called winter wheat. Former variety is sown and planted in spring and is harvested by the end of the same season. Hower winter varietis if planted in spring fail to flower or produce mature grains within a span of a flowering season . Explain, why?

Fill in the blanks: (1) Wheat, barley end rye have two kinds of varieties: winter and spring varieties. The ‘spring’ variety are normally planted in ....a.... and come to flower and produce grain before the end of growing season. (2) 'Winter varieties, however if planned in ..b... would normally fail to flower or produce mature grain within a span of flowering season. (3) hence ‘winter’ varieties are planted in ..c.... . They germinate, and over ........d come out as harvested usually around mid-summer.

Winter varieties of annual plants are planted in autumn, they germinate, and over winter come out as small seedlings, resume growth in spring and are harvested around mid-summer.

Name any two food plants which have winter and spring varieties.

It is known that some varieties of wheat are sown in autumn but are harvested around next mid summer. A.what could be the probable reason for this ? B. what term is used for this promotion of flowering under low temperature? C. which palnt hormone can replace the cold treatment?