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Standard XII
Biology
Question

Who demonstrated that cut tip of canary grass seedlings resume phototropic sensitiveness when pasted back in its position?
  1. Boysen Jensen
  2. Paal
  3. F W Went
  4. Charles Darwin

A
Charles Darwin
B
F W Went
C
Boysen Jensen
D
Paal
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Solution
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Charles Darwin used cut tip of canary grass seedlings to demonstrate the sensitivities of the stem apex to light mediated movements.
Boysen used Avena cut tips to demonstrate presence of plant hormones.
Paal showed through his experiments that some other growth promoting substances are present in cut tips.
Hence, option A is correct.

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