Phytochrome is sensitive to

The red absorbing form of phytochrome gets converted to the far-red absorbing form after getting irradiated at

What happens if winter-growing plant species are sown in the spring season?

$A$ hypothetical chemical involved in the flowering of plants is:

Which is not a requirement of vernalisation?

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?