2023 Manipur Sexual Reproduction in Flowering PlantsMegasporogenesis and female gametophyte development Medium Question 23 of 126 in Sexual Reproduction in Flowering Plants

In angiosperms the correct sequence of events in formation of female gametophyte in the ovule is: (A) 3 successive free nuclear divisions functional megaspore. (B) Degeneration of 3 megaspores. (C) Meiotic division in megaspore mother cell. (D) Migration of 3 nuclei towards each pole. (E) Formation of wall resulting in seven celled embryosac. Choose the correct answer from the options given below:

A (A), (B), (C), (D), (E)
B (C), (E), (A), (D), (B)
C (B), (C), (A), (D), (E)
D (C), (B), (A), (D), (E)

The answer is D.

Solution

The correct sequence is: Meiotic division in the megaspore mother cell producing four megaspores (C) → Degeneration of 3 of the 4 megaspores, leaving one functional megaspore (B) → 3 successive free nuclear divisions of the functional megaspore (A) → Migration of nuclei (3 towards each pole) (D) → Formation of cell walls resulting in the seven-celled, eight-nucleate embryo sac (E). Order: C, B, A, D, E.

Concept Megasporogenesis and female gametophyte development

Sexual Reproduction in Flowering Plants in past papers

126 questions from this chapter have appeared across 26 exam years.