Multiple choice

Which of the following is not a part of the triple response of etiolated pea seedling to ethylene?

  1. Stunted growth

  2. Increased radial expansion of cells of the stem

  3. Loss of gravity perception

  4. Unfolding of the apical hook of the seedling
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The triple response to ethylene in etiolated seedlings consists of three components: inhibited elongation, increased radial expansion (swelling), and epinasty. Loss of gravity perception is not part of this response. The unfolding of the apical hook is actually one of the observed effects.

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