Short night plants are known as:

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?

$A$: Only bud or embryo can be vernalized.
$R$: Vernalization requires dividing cells.

Phytochromes are active in

Which of the following statements does not characterize photoperiodism?

Give scientific reasons: Some plants flower in summer and some flower in winters.