Question

Auxin is a :

• A. Plant harmone
• B. Enzyme
• C. Fat
• D. Protein

Hint:

{Auxins} are key {plant hormones} that control plant growth. Think of them as chemical messengers in plants. They are responsible for things like:
Making stems grow longer.
Causing plants to bend towards light.
Helping roots to form. Other important plant hormones include gibberellins, cytokinins, abscisic acid, and ethylene.

Answer 1

The Correct Option is A

Concept: Auxins are a class of chemical substances that play important roles in regulating plant growth and development. Step 1: Understanding Auxins Auxins are one of the major groups of plant hormones (also called phytohormones or plant growth regulators). They are produced primarily in the apical meristems (growing tips of shoots and roots), young leaves, and developing fruits and seeds. Key functions of auxins include:
Stimulating cell elongation (leading to growth).
Involved in phototropism (plant bending towards light) and gravitropism (growth response to gravity).
Promoting root initiation.
Regulating fruit development.
Apical dominance (suppression of lateral bud growth by the apical bud). Indole-3-acetic acid (IAA) is the most common naturally occurring auxin. Step 2: Analyzing the options
(1) Plant hormone: Correct. Auxins are a well-known class of plant hormones. (Note: "harmone" in the option is likely a typo for "hormone").
(2) Enzyme: Enzymes are biological catalysts, usually proteins, that speed up biochemical reactions. Auxins are regulatory molecules, not primarily catalysts.
(3) Fat: Fats (lipids) are organic compounds used for energy storage, insulation, and as structural components of cell membranes. Auxins have a different chemical structure and function.
(4) Protein: Proteins are large, complex molecules made of amino acids, with diverse functions (e.g., enzymes, structural components, some hormones). While some hormones are proteins, auxins are smaller organic molecules, not proteins themselves. Therefore, auxin is a plant hormone.