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: Understanding the Concept:
This question requires matching specific horticultural applications with the Plant Bioregulator (PBR) or chemical used to achieve them.

Step 2: Detailed Explanation:
Let's match each application to the chemical:
\[\begin{array}{rl} \bullet & \text{(A) Rooting of cuttings: The induction of adventitious roots in cuttings is a primary function of auxins. (III) IBA (Indole-3-butyric acid) is the most widely used commercial auxin for this purpose. } \\ \bullet & \text{(B) Seed scarification: This process involves breaking, scratching, or softening the hard seed coat to allow water absorption and germination. A common method is chemical scarification using a strong (I) Acid treatment (like concentrated sulfuric acid). } \\ \bullet & \text{(C) Parthenocarpy in Mango: Parthenocarpy is the development of fruit without fertilization. While not a standard commercial practice in mango, combinations of growth regulators like (II) BA (a cytokinin) + Beta NOA (an auxin) can be used experimentally to improve fruit set and induce parthenocarpy. } \\ \bullet & \text{(D) Induction of flowering in Pineapple: Uniform flowering in pineapple is commercially induced by applying a substance that triggers it. (IV) Ethephon is commonly used, as it releases ethylene gas, which is the direct stimulus for flowering in pineapple. } \\ \end{array}\] The correct matching is: A \(\rightarrow\) III, B \(\rightarrow\) I, C \(\rightarrow\) II, D \(\rightarrow\) IV.

Step 3: Final Answer:
The correct set of matches corresponds to option 2.