Question

Which of the following is a growth promoter hormone?

• A. Auxin
• B. Abscisic acid
• C. Ethylene
• D. Both $B$ and $C$

Answer 1

The correct option is A Auxin

• The growth-promoting hormone in the plants are Auxins, Gibberellins, Cytokinesis, etc.
• It improves the growth and development of plants.
• Auxin is synthesized at the tip of the shoot of plants.
• When the tendril came in contact with a support, auxin stimulates faster growth of a cell on the opposite side that's why the tendril forms a coil around the support.

Hence, the correct option is 'auxin'.