Concept: This question tests your knowledge of seed types, specifically the classification of monocotyledonous seeds based on the presence or absence of endosperm.

Why (B) is correct:

Most monocotyledonous seeds are endospermic, meaning they retain a significant amount of endosperm tissue that provides nourishment to the developing embryo. Examples include maize, wheat, rice, and coconut. However, there are exceptions. Orchids are a notable example of monocots that produce non-endospermic seeds. In these seeds, the endosperm is either absent or completely consumed during embryo development, and the cotyledon(s) store the food reserves.

Why other options are wrong:

• (A) Incorrectly states monocots are generally non-endospermic.
• (C) Incorrectly states monocots are generally non-endospermic and incorrectly identifies castor (a dicot) as an example of a monocot exception.
• (D) Incorrectly identifies castor (a dicot) as an example of a monocot exception.

Common Mistake: Students often confuse monocot and dicot seed characteristics, or forget the exceptions to the general rules.

NEET Tip: Remember the general rule: Monocots = Endospermic (e.g., cereals), Dicots = Non-endospermic (e.g., beans). Then, remember the key exceptions: Monocot exception = Orchids (non-endospermic); Dicot exception = Castor (endospermic).

Correct Answer: (B)