The spermatids are transformed into spermatozoa by the process called:

1. Spermiation

2. Spermatocytogenesis

3. Spermiogenesis

4. Spermatolysis

Subtopic:  Spermiogenesis/Sperm Structure/Hormonal Regulation |
 74%
From NCERT
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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

Subtopic:  Seminiferous Tubules & Spermatogenesis |
 59%
From NCERT
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For normal fertility what percent of the sperm in ejaculation must exhibit vigorous motility?

1. 20

2. 30

3. 40

4. 60

Subtopic:  Semen and Male Fertility |
 72%
From NCERT
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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

Subtopic:  Ovary |
 77%
From NCERT
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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

Subtopic:  Introduction to Menstrual Cycle: 1 | Introduction to Menstrual Cycle: 2 | Introduction to Menstrual Cycle |
 71%
From NCERT
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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

Subtopic:  Menstrual Cycle: Luteal Phase |
 86%
From NCERT
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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

Subtopic:  Menstrual Cycle: Luteal Phase |
 76%
From NCERT
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What ensures that only one sperm can fertilize the ovum?

1. Corona radiata

2. Ground substance around ovum

3. Zona pellucida

4. Acrosome

Subtopic:  Fertilization: Part 2 | Fertilization |
 74%
From NCERT
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During pregnancy the levels of thyroxin:

1. Increase several folds in maternal blood

2. Increases several folds in fetal blood

3. Decreases several folds in maternal blood

4. Decreases several folds in fetal blood

Subtopic:  Fetal Development & Parturition |
 82%
From NCERT
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The first movements of the fetus and the appearance of hair on the head are usually observed during:

1. 2nd month

2. 3rd month

3. 5th month

4. 6th month

Subtopic:  Fetal Development & Parturition |
 78%
From NCERT
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