Observe the figure and answer the following questions:
Meiotic division taking place during oogenesis is an unequal division resulting in the formation of a:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Tiny 1st polar body and a secondary oocyte with nutrient rich cytoplasm.
Option (1) Tiny 2nd polar body and a secondary oocyte with nutrient rich cytoplasm — Incorrect. The second polar body comes from the second division, not the first.
Option (2) Tiny 1st polar body and a primary oocyte with nutrient rich cytoplasm. — Incorrect. The first division gives a secondary, not primary, oocyte.
Option (3) Tiny 2nd polar body and a primary oocyte with nutrient rich cytoplasm — Incorrect. The second polar body is not formed with a primary oocyte.
Option (4) Tiny 1st polar body and a secondary oocyte with nutrient rich cytoplasm. — Correct. A tiny first polar body and a large secondary oocyte with nutrient-rich cytoplasm.
NCERT Extract:
Gametogenesis – “… The theca layer is organised into an inner theca interna and an outer theca externa. It is important to draw your attention that it is at this stage that the primary oocyte within the tertiary follicle grows in size and completes its first meiotic division. It is an unequal division resulting in the formation of a large haploid secondary oocyte and a tiny first polar body (Figure 2.8b). The secondary oocyte retains bulk of the nutrient rich cytoplasm of the primary oocyte.”
