What causes the onset the puberty in males?

1. Increase in secretion of testosterone by testis

2. Decrease in secretion of testosterone by testis

3. Increase in secretion of GnRH by hypothalamus

4. Decrease in secretion of GnRH by hypothalamus

FSH:

1. Acts on Sertoli cells and stimulates secretion of some factors that help in spermiogenesis

2. Acts on Sertoli cells and inhibits secretion of some factors that help in spermiogenesis

3. Acts on Leydig cells and stimulates secretion of some factors that help in spermiogenesis

4. Acts on Leydig cells and inhibits secretion of some factors that help in spermiogenesis

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

(1) 20

(2) 30

(3) 40

(4) 60

The function of male sex accessory ducts and glands are maintained by:

1. Hypothalamic releasing hormone

2. Pitutary gonadotropins

3. Adrenal cortex steroids

4. Testicular androgens

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 $\stackrel{ }{\to }$ Follicular $\stackrel{ }{\to }$ secretory $\stackrel{ }{\to }$ Ovulatory

(2) Menstrual $\stackrel{ }{\to }$ Follicular $\stackrel{ }{\to }$ Ovulatory $\stackrel{ }{\to }$ secretory

(3) Ovulatory $\stackrel{ }{\to }$ Follicular $\stackrel{ }{\to }$ secretory $\stackrel{ }{\to }$ Menstrual

(4) Menstrual $\stackrel{ }{\to }$ secretory $\stackrel{ }{\to }$ Follicular $\stackrel{ }{\to }$ Ovulatory

LH surge:

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:

1. Stops secreting progesterone but increases the secretion of estrogen

2. Stops secreting estrogen but increases the secretion of progesterone

3. Increases the secretion of both progesterone and estrogen

4. Degenerates

What ensures that only one sperm can fertilize the ovum?

1. Corona radiata

2. Ground substance around ovum

3. Zona pellucida

4. Acrosome