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A response to length of day in plants is called

$\begin{array}{1 1}(A)\;\text{Phototropism}\\(B)\;\text{Photorespiration}\\(C)\;\text{Photoperiodism}\\(D)\;\text{Photo-oxidation}\end{array}$

Can you answer this question?

A response to length of day in plants is called photoperiodism.
Hence (C) is the correct answer.
answered Apr 9, 2014