NEETBotanySexual Reproduction in Flowering Plants
Read the following statement and choose the option that correctly fills the blanks (A) and (B). In an angiosperm ovule, the megaspore mother cell (MMC) generally differentiates from a single cell of the ___(A)___ in the ___(B)___ region.
Options
- A(A) - Nucellus, (B) - Micropylar
- B(A) - Nucellus, (B) - Chalazal
- C(A) - Integument, (B) - Micropylar
- D(A) - Endosperm, (B) - Chalazal
Correct answer
A. (A) - Nucellus, (B) - Micropylar
Step-by-step solution
According to NCERT, ovules generally differentiate a single megaspore mother cell (MMC) in the micropylar region of the nucellus. It is a large cell containing dense cytoplasm and a prominent nucleus. Therefore, the MMC differentiates from the nucellus (A) at the micropylar pole (B). The chalazal pole is the basal part of the ovule, opposite to the micropylar end. The integuments are protective envelopes, and the endosperm is a post-fertilization nutritive tissue. Answer: (A) - Nucellus, (B) - Micropylar