Consider the following two statements:

I. The hymen is often torn during the first coitus.

II. The presence or absence of hymen is a reliable indicator of virginity.

Of the two statements:

1. Both I and II are correct and II explains I.

2. Both I and II are correct and II does not explain I.

3. I is correct but II is incorrect.

4. Both I and II are incorrect.

The correct sequence of mammalian mammary gland ducts beginning from alveoli would he:

The spermatids are transformed into spermatozoa by the process called:

1. Spermiation

2. Spermatocytogenesis

3. Spermiogenesis

4. Spermatolysis

The final release of sperms from the seminiferous tubules is called:

1. Spermiation

2. Emission

3. Retrograde ejaculation

4. Ejaculation

For normal fertility what percent of the sperm in ejaculation must exhibit vigorous motility?

1. 20

2. 30

3. 40

4. 60

The division of primary oocyte results in:

1. unequal cells a smaller haploid secondary oocyte and a larger diploid polar body

2. unequal cells a larger haploid secondary oocyte and a smaller haploid polar body

3. unequal cells a smaller diploid secondary oocyte and a larger haploid polar body

4. equal cells - a haploid secondary oocyte and a haploid polar body

The correct sequence of the various phases of a typical menstrual cycle is:

1. Menstrual → Follicular → secretory → Ovulatory

2. Menstrual → Follicular → Ovulatory → secretory

3. Ovulatory → Follicular → secretory → Menstrual

4. Menstrual → secretory → Follicular → Ovulatory

During pregnancy:

1. All events of menstrual cycle stop and there is no menstruation

2. Events of menstrual cycle continue but there is no menstruation

3. Events of menstrual cycle contInue but there is menstruation only in the first trimester

4. All events of menstrual cycle stop and there is menstruation only in the first trimester

In the absence of fertilization, corpus luteum:

What ensures that only one sperm can fertilize the ovum?

1. Corona radiata

2. Ground substance around ovum

3. Zona pellucida

4. Acrosome