Question

Match the structures in the Angiospermic embryosac in List I with their correct ploidy levels in List II.

List I (Structures in the Angiospermic embryosac)	List II (Ploidy levels)
(A). Definitive nucleus	(I). n
(B). Synergid	(II). 3n
(C). Primary Endosperm Nucleus	(III). 2n

Choose the correct answer from the options given below:

• (A) - (I), (B) - (II), (C) - (III).
• (A) - (III), (B) - (I), (C) - (II).
• (A) - (II), (B) - (III), (C) - (I).
• (A) - (III), (B) - (II), (C) - (I).

Hint:

Synergids are haploid, the definitive nucleus is diploid and the primary endosperm nucleus is triploid.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
All cells of the embryo sac arise by mitosis from the haploid functional megaspore.

Step 2: Match each structure
(A) Definitive nucleus: two polar nuclei fuse, so it is 2n (III).
(B) Synergid: it is haploid, n (I).
(C) Primary endosperm nucleus: formed by fusion of one male gamete (n) with the definitive nucleus (2n), so it is 3n (II).

Step 3: Conclusion
The pairs are (A)-(III), (B)-(I), (C)-(II).

Final Answer:
The matching is (A)-(III), (B)-(I), (C)-(II). \[ \boxed{\text{(B) }\text{(A) - (III), (B) - (I), (C) - (II).}} \]