Question

Match List I with List II 

Choose the correct answer from the options given below: 
 

• A. A-III, B-IV, C-II, D-I
• B. A-III, B-IV, C-I, D-II
• C. A-III, B-II, C-IV, D-I
• D. A-II, B-I, C-IV, D-III

Hint:

Self-pollinated (Wheat, Rice) \( \rightarrow \) Minimum Distance (3m).
Often-cross (Pigeonpea, Cotton) \( \rightarrow \) Moderate Distance (50-100m).
Cross-pollinated (Maize, Bajra, Radish) \( \rightarrow \) High Distance (200-1000m).

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
Isolation distance is the minimum required distance between two seed fields of the same crop to prevent unwanted cross-pollination and maintain genetic purity. The distance depends on the crop's pollination mechanism (self vs. cross).

Step 2: Detailed Explanation:

• Wheat (A-III): Wheat is highly self-pollinated. The chances of natural outcrossing are very low. For certified seed production, the minimum isolation distance is only 3 meters (primarily to prevent mechanical mixing).

• Composite Variety of Maize (B-IV): Maize is a cross-pollinated crop (anemophilous). Composite varieties require a significant isolation distance to prevent contamination from other maize pollen. The standard distance for certified seeds is 200 meters.

• Radish (C-I): Radish is a highly cross-pollinated crop (insect-pollinated) and often shows self-incompatibility. To maintain the genetic integrity of a variety, a large isolation distance is required, typically 1000 meters (1 km) for certified seeds.

• Pigeonpea (D-II): Pigeonpea is an "often cross-pollinated" crop. While it can self-pollinate, there is significant natural outcrossing by insects. The requirement for certified seed production is 100 meters.
Final Answer:
Matching: A-III, B-IV, C-I, D-II.
This matches option (B).