The curvature causing stimulus is active on the dark side of the coleoptile tip was first demonstrated by

Options :
  1. Fitting
  2. Boysen Jensen
  3. Paal
  4. Went
Answer and Explanation :-

Answer: Option 2

Explanation:

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In our world," said Eustace, "a star is a huge ball of flaming gas."Even in your world, my son, that is not what a star is, but only what it is made of.
-C.S. Lewis The Voyage of the Dawn Treader