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Q.

Which of the following are long night plants?

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a

Chrysanthemum 

b

Soybean

c

Tobacco

d

All the above

answer is D.

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Detailed Solution

  • Short day plants also are called long night plants because these plants require short days but long nights to be able to flower properly. 
  • The nights must be long and uninterrupted for them to flower. 
  • Such a dependency on the length of the day is named photoperiodism.
  • Examples are soybean, tobacco, chrysanthemum etc.
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