Question

Given below are two statements:
Statement (I): The non deep type is the most common primary dormancy
Statement (II): In this type of dormancy species require light or darkness to germinate or chilling stratification
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:

Seed dormancy ensures germination at the right time.
Non-deep dormancy: Common, embryo is developed. Broken by conditions like light, after-ripening (dry storage), or alternating temperatures.
Deep dormancy: Requires more specific, often prolonged treatments like chilling stratification (moist cold). Statement II incorrectly groups chilling stratification with common requirements for non-deep dormancy.

Answer 1

The Correct Option is C

Let's evaluate each statement about seed dormancy: Statement (I): The non deep type is the most common primary dormancy. Primary dormancy is a state where a seed is unable to germinate even under favorable conditions, right after it is shed from the parent plant. Non-deep physiological dormancy is indeed a very widespread type of primary dormancy across many plant species. It means the embryo is developed, but germination is inhibited by factors within the seed itself. This statement is generally considered true. Statement (II): In this type of dormancy [non-deep type] species require light or darkness to germinate or chilling stratification. Non-deep physiological dormancy can be broken by various environmental cues. Some species with this dormancy type do require specific light conditions (either presence or absence of light) for germination. However, "chilling stratification" (a period of moist cold treatment) is primarily a requirement for breaking *deep* physiological dormancy or certain types of morphophysiological dormancy. While some non-deep dormancies might be overcome by mild temperature fluctuations or dry after-ripening, extensive chilling stratification is not a characteristic requirement for all or even most non-deep dormancies. Therefore, including chilling stratification as a general requirement for breaking non-deep dormancy makes Statement (II) false. Since Statement (I) is true and Statement (II) is false, the correct option is (3). Statement (I) is true but Statement (II) is false.