Question

Given below are four phytohormones select the one to which ABA acts antagonistically.

• A. Gibberellic acid
• B. Ethylene
• C. Kinetin
• D. Indole Acetic acid

Answer 1

Answer:

A. Gibberellic acid

• If two hormones have opposite actions on the plant body they are considered to be antagonistic.

• Abscisic acid (ABA) is a plant growth inhibitor and plays a vital role in inhibiting plant metabolism and also induces seed dormancy under stressful conditions.

• GAs are a group of growth hormone strongly associated with promoting growth, including stem elongation and seed germination.

• So ABA functions as an antagonist to Gibberellins.