Question

Match List-I with List-II
\[\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \textbf{Use of PBR/ Chemical} & \textbf{Name of PBR/ Chemical} \\ \hline \text{(A). Rooting of cuttings} & \text{(I). Acid treatment} \\ \hline \text{(B). Seed scarification} & \text{(II). BA+ Beta NOA} \\ \hline \text{(C). Parthenocarpy in Mango} & \text{(III). IBA} \\ \hline \text{(D). Induction of flowering in Pineapple} & \text{(IV). Ethephon} \\ \hline \end{array}\]
Choose the correct answer from the options given below:

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

Hint:

Associate key chemicals with their "killer app": IBA \(\rightarrow\) Rooting, Ethephon \(\rightarrow\) Ripening/Pineapple flowering, GA3 \(\rightarrow\) Grape size/Breaking dormancy, MH \(\rightarrow\) Sprout suppression.

Answer 1

The Correct Option is B

Step 1: Overview:
This question asks to connect horticultural uses with their corresponding Plant Bioregulators (PBRs) or chemicals.

Step 2: Breakdown:
Matching each application to its chemical:
\[\begin{array}{rl} \bullet & \text{(A) Rooting of cuttings: Auxins are used to promote adventitious roots in cuttings. (III) IBA (Indole-3-butyric acid) is the main commercial auxin for this. } \\ \bullet & \text{(B) Seed scarification: This involves softening the seed coat for water absorption. (I) Acid treatment (e.g., concentrated sulfuric acid) is a typical method. } \\ \bullet & \text{(C) Parthenocarpy in Mango: Parthenocarpy is fruit development without fertilization. Combinations of growth regulators like (II) BA (a cytokinin) + Beta NOA (an auxin) can be used experimentally. } \\ \bullet & \text{(D) Induction of flowering in Pineapple: Uniform flowering in pineapple is induced by applying a trigger. (IV) Ethephon, which releases ethylene gas, is commonly used to stimulate flowering. } \\ \end{array}\]The correct matches are: A \(\rightarrow\) III, B \(\rightarrow\) I, C \(\rightarrow\) II, D \(\rightarrow\) IV.

Step 3: Answer:
The correct answer choice is option 2.