Concept: This question tests your understanding of seed dormancy, a crucial survival mechanism in plants, and the conditions that lead to its occurrence.

Why (B) is correct: Seed dormancy is a state where a seed is unable to germinate even under seemingly favorable environmental conditions. This occurs primarily due to unfavourable conditions in the environment, or internal factors that prevent germination until suitable conditions arise. It's a survival strategy to ensure germination happens when chances of seedling survival are highest.

Why other options are wrong:

• (A) Due to favourable conditions: Favourable conditions (like adequate moisture, temperature, and oxygen) are what break dormancy and promote germination, not cause dormancy.
• (C) Due to embryonic conditions: While the embryo's maturity is a factor, 'embryonic conditions' alone don't fully explain dormancy. Dormancy is often due to external inhibitors or hard seed coats, in response to environmental cues.
• (D) Due to specific endosperm conditions: The endosperm provides nourishment, but its 'conditions' are not the primary cause of dormancy. Hormonal inhibitors or physical barriers are more direct causes.

Common Mistake: Students often confuse the conditions that cause dormancy with the conditions that break dormancy. Dormancy is a protective mechanism against unfavourable conditions.

NEET Tip: Remember that dormancy can be caused by both exogenous factors (e.g., hard seed coat, chemical inhibitors in fruit pulp) and endogenous factors (e.g., immature embryo, presence of abscisic acid).

Correct Answer: (B)