MCQs - CBSE Solution of Class 12 Biology Human Reproduction

Questions

136 Which part of ovary in mammals acts as an endocrine gland after ovulation?

1 Stroma

2 Germinal epithelium

3 Vitelline membrane

4 Graafian follicle

View Answer

Answer: Graafian follicle

137 What is true for cleavage?

1 Size of embryo increases

2 Size of cells decreases

3 Size of cells increases

4 Size of embryo decreases

View Answer

Answer: Size of cells decreases

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138 Coelom derived from blastocoels is known as

1 schizocoel

2 pseudocoelom

3 haemocoel

4 enterocoelom

View Answer

Answer: pseudocoelom

139 Human eggs are

1 Mesolecithel

2 Microlecithel

3 Macrolecithel

4 Alecithal

View Answer

Answer: Alecithal

140 Correct sequence of hormone secretion from beginning of menstruation is

1 FSH, progesterone, estrogen

2 Estrogen, FSH, progesterone

3 FSH, estrogen progesterone

4 Estrogen, progesterone, FSH

View Answer

Answer: FSH, estrogen progesterone

141 Ovulation in the human female normally takes place during the menstrual cycle

1 At the end of the proliferative phase

2 At the beginning of the proliferative phase

3 Just before the end of the secretory cycle

4 At the mid secretory phase

View Answer

Answer: At the end of the proliferative phase

142 The Leydig cells as found in the human body are the secretory source of

1 Glucagon

2 Androgens

3 Progesterone

4 Intestinal mucus

View Answer

Answer: Androgens

143 The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is

1 Spermatogonia-spermatid-spermatocyte-sperms

2 Spermatocyte-spermatogonia-spermatid-sperms

3 Spermatogonia-spermatocyte-spermatid-sperms

4 Spermatid-spermatocyte-spermatogonia-sperms

View Answer

Answer: Spermatogonia-spermatocyte-spermatid-sperms

144 Where do the female gonads (paired ovaries) lie?

1 Pelvic cavity

2 Thoracic cavity

3 Abdominal cavity

4 Scrotal sacs

View Answer

Answer: Pelvic cavity

145 Which one of the followings regarding 'Estrogen' is correct?

1 Causes the endometrium to rebuild

2 Has no effect on the Wolffian duct

3 Maintains the secondary sexual characteristics in female

4 All of these

View Answer

Answer: All of these

146 Corpus leteum develops from

1 Oocyte

2 Nephrostome

3 Graafian follicle

4 None of the above

View Answer

Answer: Graafian follicle

147 Which of the following are secretions produced by the spermatozoa at the time of fertilization?

1 Fertilizin and sperm lysin

2 Anti-fertilizin and sperm lysin

3 Fertilizin and anti-fertilizin

4 Only sperm lysin

View Answer

Answer: Anti-fertilizin and sperm lysin

148 About 60% of the semen is formed by secretion of

1 Cowper’s gland

2 Seminiferous tubule

3 Prostate gland

4 Seminal vesicles

View Answer

Answer: Seminal vesicles

149 Corpus luteum disintegrates due to non-availability of

1 LTH

2 FSH

3 Progesterone

4 LH

View Answer

Answer: LH

150 After ovulation, Graafian follicle forms

1 Corpus luteum

2 Corpus albicans

3 Corpus artesia

4 Corpus callosum

View Answer

Answer: Corpus luteum

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