Correct answer: (3) Parthenogenesis

Explanation:

• Gibberellic acid (GA) is widely known for roles in stem elongation, parthenocarpy, and malt production.

• GA promotes stem elongation by stimulating cell division and elongation.

• GA induces parthenocarpy, the development of fruit without fertilization, commonly used in seedless fruit production (e.g., seedless grapes).

• GA aids malt production by stimulating enzymatic breakdown of starch during barley malting.

• Parthenogenesis (development of an embryo from an unfertilized egg) is not typically associated with GA signaling in plants; it occurs usually via other mechanisms independent of GA.

Option explanation:

• (1) Stem elongation – GA promotes this growth process.

• (2) Parthenocarpy – GA induces seedless fruit formation without fertilization.

• (3) Parthenogenesis – Not associated with GA in typical plant development.

• (4) Malt production – GA stimulates α-amylase for starch degradation during malting.