$A$ pigment responsible for light sensitivity in plants is

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

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

The relation of flowering to the lengths of light and dark periods was investigated by two experiments. In one experiment,the plants were subjected to dark periods of various lengths while the light periods were kept at $4$ hours. In the second experiment,plants were kept in dark periods of various lengths while the light periods were kept at $16$ hours. The number of flowers formed in relation to these periods is shown in the table. These results indicate that flowering:

Dark periods (hours)	Flowers formed (Light: $4$ hrs / $16$ hrs)
$8$	$0$ / $0$
$10$	$0$ / $0$
$12$	$4$ / $6$
$14$	$5$ / $7$
$16$	$5$ / $8$

Phytochrome is:

Give scientific reasons: It is appropriate to call a short-day plant a long-night plant.