Florigen is synthesized in

Vernalisation is done at

When all parts except the leaves of a short-day plant are covered with a light-proof cover and then subjected to short-day light/dark treatment,it will produce flower buds. When a portion of this plant is grafted onto another plant of the same species which has been prevented from flowering by excessive exposure to light,this latter plant will also produce flower buds. Which is the best inference from this result?

Short day plants initiate flowering if:

Phytochrome plays an important role in

In some plants,the cold treatment may be replaced by the application of