Flowering of plants by exposure to low temperature is called

Write a short note on vernalisation.

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 plant hormone can replace the cold treatment?

Some plants require a period of light greater than a critical duration for flowering. Such plants are called $..............$.

If a tree flowers three times a year (in $October$, $January$, and $July$) in North India, what can be said about it?

Which of the following pairs is mismatched?