Question

Match List-I with List-II
\[\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \textbf{PGR} & \textbf{Practical utility} \\ \hline \text{(A). Auxins} & \text{(I). Fruit ripening} \\ \hline \text{(B). Gibberellins} & \text{(II). Root induction} \\ \hline \text{(C). Cytokinin} & \text{(III). Germination} \\ \hline \text{(D). Ethephon} & \text{(IV). Shoot proliferation} \\ \hline \end{array}\]
Choose the correct answer from the options given below:

• (A) - (II), (B) - (III), (C) - (IV), (D) - (I)
• (A) - (I), (B) - (III), (C) - (II), (D) - (IV)
• (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

Remember the 5 classic plant hormones and their main jobs: Auxin (Roots & Tropisms), Gibberellin (Stem elongation & Germination), Cytokinin (Cell division & Shoot growth), Ethylene (Ripening & Senescence), and Abscisic Acid (Dormancy & Stress).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
This question requires matching major classes of Plant Growth Regulators (PGRs) with their primary practical applications in horticulture.

Step 2: Detailed Explanation:
Let's match each PGR to its utility:
\[\begin{array}{rl} \bullet & \text{(A) Auxins: As a class of hormones, auxins are fundamentally involved in cell elongation and differentiation. Their most prominent practical use is to stimulate adventitious root formation, i.e., (II) Root induction, in cuttings. } \\ \bullet & \text{(B) Gibberellins: These hormones are known to break seed and bud dormancy and promote stem elongation. They play a crucial role in the process of (III) Germination. } \\ \bullet & \text{(C) Cytokinin: Named for their role in cytokinesis (cell division), cytokinins are extensively used in plant tissue culture to stimulate cell division and induce the formation of multiple shoots from a single explant, a process known as (IV) Shoot proliferation. } \\ \bullet & \text{(D) Ethephon: This is a synthetic compound that releases ethylene gas upon application. Ethylene is the natural ripening hormone in plants, so Ethephon is widely used to commercially induce uniform (I) Fruit ripening. } \\ \end{array}\] The correct matching is: A \(\rightarrow\) II, B \(\rightarrow\) III, C \(\rightarrow\) IV, D \(\rightarrow\) I.

Step 3: Final Answer:
The correct set of matches corresponds to option 1.