Question

Match List I with List II
List I (Crop):
A. Rice
B. Lucerne
C. Wheat
D. Rapeseed and Mustard
List II (Objectionable weeds):
I. Wild morning glory
II. Mexican prickly poppy
III. Wild rice
IV. Dodder
Choose the correct answer from the options given below:

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

Hint:

Argemone mexicana is the classic objectionable weed of rapeseed and mustard because its seeds look identical to mustard seeds, causing dropsy epidemic risks. Dodder (Cuscuta) is always associated with Lucerne.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
An objectionable weed is a weed species whose seeds are highly difficult to separate from the crop seeds during mechanical processing, or whose plants are highly destructive or parasitic.
Their presence is strictly regulated in certified seed production.

Step 2: Detailed Explanation:
Let us match each crop with its designated objectionable weed under seed certification standards:
A. Rice (Oryza sativa): The designated objectionable weed is wild rice (Oryza sativa var. fatua).
Because it belongs to the same genus and species, its seed size, shape, and weight are almost identical to cultivated rice, making mechanical separation impossible.
Therefore, A matches with III (Wild rice).
B. Lucerne (Medicago sativa): The designated objectionable weed is dodder (Cuscuta spp.).
Dodder is a parasitic weed whose small, round seeds contaminate lucerne seed lots and are extremely difficult to separate.
Therefore, B matches with IV (Dodder).
C. Wheat (Triticum aestivum): The designated objectionable weed is wild morning glory (Convolvulus arvensis).
Its climbing habit interferes with harvesting, and its seeds contaminate wheat grain.
Therefore, C matches with I (Wild morning glory).
D. Rapeseed and Mustard (Brassica spp.): The designated objectionable weed is Mexican prickly poppy (Argemone mexicana).
Its black, round seeds closely resemble mustard seeds, causing physical contamination and toxicity (dropsy) if consumed.
Therefore, D matches with II (Mexican prickly poppy).

Step 3: Final Answer:
Matching the pairs yields: A - III, B - IV, C - I, D - II, which corresponds to Option (D).