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Q.

Four potted plants (I, II, III and IV) of a short day plant, which has the critical period of 14 hours : are taken and exposed to light periods given are listed in the table.            

Potted plant                   Photoperiod

 I                                      10 hrs

II                                    15 hrs

III                                   16 hrs

 IV                                   20 hrs

Which potted plant will show flowering after exposure to light?

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a

b

II

c

III

d

IV 

answer is A.

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Detailed Solution

A short day plant, which has a critical period of 14 hour, will flower only it if is provided a continuous period of darkness of 14 hours, which has been given to the potted plant –I only.

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