Multiple choice

Which of the following is incorrect about ethylene?

  1. It promotes elongation of stems and root, especially in dicot.

  2. Its biosynthesis involves the enzyme ACC synthase.

  3. It promotes flowering in Bromeliads (the pineapple family).

  4. It enhances lateral or radial expansion of cell.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ethylene promotes stem and root elongation in MONOCOTS (like rice), but in DICOTS, it actually inhibits elongation and promotes swelling. This makes statement A incorrect. B is true - ACC synthase is key in ethylene biosynthesis. C is true - ethylene induces flowering in Bromeliads including pineapple. D is true - ethylene promotes radial/lateral expansion (the 'triple response' in seedlings). Therefore A is the incorrect statement.

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