Question

If a person tests plant hormones for increasing the crop yield, he sprays a large plot with a selected hormone to determine its effect in hybrid vigor. Which of the following he should avoid?

• A. $2,4-$D
• B. IAA
• C. Gibberellin
• D. Cytokinin
• E. Abscisic acid

Answer 1

The correct option is A $2,4-$D

There are five major types of plant hormones. Abscisic Acid also called ABA is one of the most important plant's growth regulators and under water stress, this hormone plays a role in closing the stomata. Auxins are hormones that positively influence cell enlargement, bud formation and root initiation. Cytokinins tend to positively influence cell enlargement, bud formation and root initiation. Others are ethylene regulates the fruit ripening and Gibberellins stimulates the flower production, cell elongation. Whereas 2, 4-D is not a plant hormone but a chemical weedicide.