Question 1

The primary female sex organ is:

Accepted Answer

Ovary is considered the primary female sex organ because it produces female gametes (ovata) and secretes steroid sex hormones.

Question 2

The number of autosomes in a human primary spermatocyte is:

Accepted Answer

A human primary spermatocyte is diploid (2n = 46), containing 44 autosomes and 2 sex chromosomes (XY).

Question 3

Seminal plasma in humans is rich in:

Accepted Answer

Seminal plasma secreted by accessory glands is rich in fructose, calcium, and certain enzymes.

Question 4

The middle piece of the human sperm contains:

Accepted Answer

The middle piece of the human sperm contains numerous mitochondria, which provide energy for the movement of the tail that is essential for fertilization.

Question 5

The process of formation of a mature female gamete is called:

Accepted Answer

Oogenesis is the process of formation of a mature female gamete (ovum) from the oogonia in the ovary.

Human Reproduction — NCERT Class 12 Biology Important Questions & Revision Notes