Question

Assertion: Essentially, the phases of oogenesis are significantly different from spermatogenesis.

Reason: The complete process of oogenesis finishes in the fetal stage.

• A. If both assertion and reason are true but reason is not the correct explanation of the assertion.
• B. If both assertion and reason are true and the reason is the correct explanation of the assertion.
• C. If both assertion and reason are false.
• D. If the assertion is true but the reason is false.

Answer 1

The correct option is D If the assertion is true but the reason is false.

Oogenesis and spermatogenesis refer to the complete processes of maturation and development of female and male gametes respectively. In males, spermatogenesis starts after attaining puberty stage but in females oogenesis process starts during the embryonic stage. Both are completed in three phase ; multiplicative, growth and maturation phase.

Follicles development happens during the embryonic stage where the oogonia are formed which later form the primary oocytes. The primary oocytes become arrested in the diplotene stage of prophase I (the prophase of the first meiotic division). Shortly before birth, all the fetal oocytes in the female ovary have attained this stage. The final step of oogenesis takes place when the sperm fertilises the egg. Thus, the reason is a false statement.