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Differentiate between Photoperiodism and Vernalization.

In respect of photomorphogenesis,plants are most sensitive to:

$A$: Phytochrome,a protein,has a regulatory function.
$R$: Various morphogenetic processes are regulated by it.

Phytochrome is involved in:

$A$ short-day plant was exposed to alternating red-far red light treatments. What would happen if the last treatment was of far-red light?

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