Question

Given below are two statements
Statement I: Presence of objectionable weed seed reduces the physiological quality of a seed lot.
Statement II: Seeds of objectionable weed have same shape and size as the main crop seeds.
In light of the above statements, choose the most appropriate answer from the options given below

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Hint:

Remember the 3 "Difficulties" of Objectionable Weeds:
1. Difficult to distinguish (Mimicry).
2. Difficult to separate (Similar size/shape).
3. Difficult to eradicate (Persistence).

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question deals with seed technology concepts, specifically the definition and impact of "objectionable weeds" on seed quality and certification.

Step 2: Detailed Explanation:

• Definition of Objectionable Weeds (Statement II): Objectionable weeds are those weed species whose seeds are very difficult to separate from the crop seeds once mixed.
This difficulty arises because the weed seeds possess physical characteristics—such as size, shape, and weight—that are nearly identical to the crop seeds.
Common examples include Argemone mexicana in mustard and Convolvulus arvensis in wheat.
Therefore, Statement II is correct.

• Impact on Seed Quality (Statement I): The presence of these weed seeds reduces the overall quality of the seed lot.
"Physiological quality" refers to parameters like germination percentage, vigor, and health.
In many cases, objectionable weed seeds are toxic (e.g., Argemone) or highly competitive, leading to poor crop performance and contamination that persists for generations.
Moreover, their presence can disqualify a seed lot from certification as per seed standards.
Thus, Statement I is correct.
Final Answer:
Since Statement I describes the harmful impact and Statement II describes the physical mimicry characteristic of objectionable weeds, both statements are true.
The correct option is (A).