Question

Which hormone is responsible for bolting in rosette plants?

• A. Auxin
• B. Cytokinin
• C. Gibberellin
• D. Ethylene Correct Answer: (C) Gibberellin

Hint:

To easily remember this on an exam, use this simple sound-association trick: Gibberellins make things Giant! Whether it is making individual grape stalks longer, stretching out sugarcane stalks, or causing a flat cabbage rosette to bolt upward into a tall tower, Gibberellin is always your go-to hormone for stem elongation.

Answer 1

The Correct Option is C

Step 1: What is bolting.
Some plants like cabbage and beet stay short with leaves packed near the ground. This packed form is a rosette. Bolting is when the stem suddenly shoots up tall before flowering.

Step 2: Find the hormone.
Gibberellin makes stems grow longer by stretching the parts between the nodes. When sprayed on a rosette plant, it makes the short stem stretch out fast.

Step 3: Rule out the others.
Auxin, cytokinin and ethylene do other jobs and do not cause this sudden stem stretch.

Step 4: Final choice.
Bolting in rosette plants is due to gibberellin, option 3.
\[ \boxed{\text{Gibberellin}} \]