To induce early flowering in plants, pre-treatment of seeds or seedlings is done at . . . . . . $1-6^{\circ} C$ temperature.

For the germination of seed,which light is necessary?

Vernalization is defined as .....

Photoperiodism is substituted by

Differentiate between Short Day Plants $(SDP)$ and Long Day Plants $(LDP)$.

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.