Question

Root development is promoted by

• A. Abscisic acid
• B. Auxin
• C. Gibberellin
• D. Ethylene

Answer 1

The correct option is B

Auxin

The correct option is B.

Explanation of correct option:

1. Auxins are a series of plant hormones that can be found naturally or synthesized artificially.
2. It controls cell division, elongation and differentiation, embryonic development, root development, apical dominance, and blooming transition in plants.

Explanation of incorrect options:

Option A:

1. Abscisic acid (ABA) is a hormone that is commonly linked to key plant stress responses.
2. It has a key function in seed development and maturation, as well as the manufacture of proteins and suitable osmolytes that allow plants to withstand stressors caused by environmental or biotic causes.

Option C:

1. Gibberellin is a plant hormone that may be found in seeds, young leaves, and roots.
2. It aids in cell elongation, allowing the plants to grow higher.
3. They are also important for germination, stem elongation, fruit ripening, and blooming.

Option D:

Ethylene is a class of plant growth regulators that are frequently used to speed up the ripening of fruits and increase the number of blooms and fruits produced.

Final answer: Root development is promoted by auxins.