Question

The corpus luteum is developed from the:

• A. Oocyte
• B. Nephrostome
• C. Leftover oocyte
• D. Leftover graafian follicle after the release of the ovum

Answer 1

The correct option is D

Leftover graafian follicle after the release of the ovum

The correct option is option D.

Explanation of the correct option:

1. A large mass of yellow cells in the ovarian cortex is called corpus luteum.
2. It is formed in the cavity of the leftover Graafian follicle after the release of the ovum from it.
3. It secretes the hormone progesterone during pregnancy, and hormone relaxin at the end of pregnancy.

Explanation of the incorrect options:

Option A:

1. The egg mother cells enlarge and form the primary oocyte.
2. During maturation, the primary oocyte first changes to a secondary oocyte which consequently changes to a haploid ovum.

Option B:

1. Nephrostome is a funnel-like component of a metanephridium.
2. It pushes water, metabolic wastes, unnecessary hormones, and other substances into the metanephridium.

Option C:

1. During the maturation of the primary oocyte to the secondary oocyte, one polar body is formed which is called the first polar body.
2. Similarly, during the maturation of the secondary oocyte to the ovum, another polar body is formed which is called the second polar body.

Final answer: The corpus luteum is developed from the leftover Graafian follicle after the release of the ovum.