$SDP$ is also called:

Fill in the blanks:
$(1)$ ........ initiate rooting.
$(2)$ The pigment involved in photo-perception in flowering plants is ........

In some plants,flowering is induced only when the duration of light exposure is less than a critical duration. Such plants are called $...............$.

All given statements are correct with respect to photoperiodism,except:

On germination,a seed first produces shoots with leaves,and flowers appear later.
$(A)$ Why do you think this happens?
$(B)$ How is this advantageous to the plant?

Which of the following is a short-day plant?