In short-day plants,flowering is induced by:

If the dark period is interrupted by red light in $SDP$,the plant will show:

$A$ long-day plant will show flowering when the critical photoperiod duration is as follows:
Duration of light period $= A$
Duration of dark period $= B$

During the photoperiodic induction,$........$ is translocated from leaves to shoot buds to induce flowering.

Which of the following statements are $INCORRECT$ with respect to phytochrome?
$i$. Phytochrome is a light-receiving proteinaceous pigment present in the leaves of plants.
$ii$. Phytochrome pigment exists in two forms.
$iii$. Two forms of phytochromes are interconvertible.
$iv$. Phytochromes are located in the chloroplast of green cells.
$v$. Phytochrome $P_r$ form inhibits flowering in $LDP$ during the dark period.

Phytochrome is a ......