Question

_______ is the most common auxin in plants.

• A. \( \text{Indole acetic acid} \)
• B. \( \text{2,4-dichlorophenoxy acetic acid} \)
• C. \( \text{2,4,5-trichloro phenoxy acetic acid} \)
• D. \( \text{Ethylene} \)

Hint:

Remember IAA as the main natural auxin. The "AA" in IAA stands for acetic acid, and "Indole" refers to the ring structure.

Answer 1

The Correct Option is A

Indole acetic acid (IAA) is the most common naturally occurring auxin in plants. Auxins are a class of plant hormones that play a crucial role in various growth and developmental processes, including cell elongation, apical dominance, and root formation. While synthetic auxins like 2,4-D and 2,4,5-T are also used, IAA is the primary endogenous auxin found in plants. Ethylene is another plant hormone, but it belongs to a different class and primarily regulates fruit ripening and senescence.