Question

Identify the INCORRECT statement about gibberellins.

• A. It promotes bolting in beet and cabbage.
• B. It causes epinasty of leaves and flowers.
• C. It promotes seed germination in cereals.
• D. It breaks dormancy of seed and hastens germination.

Hint:

Epinasty, the downward bending of leaves, is caused by ethylene and not by gibberellins.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
Gibberellins are plant growth regulators that cause stem elongation, bolting and the breaking of dormancy.

Step 2: Check each statement
Bolting in beet and cabbage is a gibberellin effect, so (A) is true.
In cereals, gibberellin makes aleurone cells produce alpha-amylase and promotes germination, so (C) is true.
Gibberellins break seed dormancy and hasten germination, so (D) is true.

Step 3: Find the incorrect one
Epinasty is the downward curving of leaves and flowers caused by faster growth on the upper side. It is an effect of ethylene, not of gibberellins, so (B) is incorrect.

Final Answer:
The incorrect statement is that gibberellin causes epinasty of leaves and flowers. \[ \boxed{\text{(B) }\text{It causes epinasty of leaves and flowers.}} \]