A hypothetical 'florigen' could be produced p | vedclass

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(B) Long-day plants $(LDP)$ require a critical day length to flower. The flowering response is mediated by the phytochrome system. In $LDP$,the active

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Red light during the night

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(B) Long-day plants $(LDP)$ require a critical day length to flower. The flowering response is mediated by the phytochrome system. In $LDP$,the active form of phytochrome,$P_{fr}$,promotes flowering. During the night,$P_{fr}$ is converted back to $P_r$. By exposing the plant to red light during the dark period,$P_r$ is converted back to $P_{fr}$,thereby maintaining high levels of $P_{fr}$ and triggering the production of the hypothetical flowering hormone,'florigen',even if the natural day length is short.

$A$ hypothetical 'florigen' could be produced prematurely in a long-day plant by exposing it to:

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