MCQs - CBSE Solution of Class 12 Biology Human Reproduction

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

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

Answer: Size of cells decreases

138 Coelom derived from blastocoels is known as

[1] schizocoel

[2] pseudocoelom

[3] haemocoel

[4] enterocoelom

Answer: pseudocoelom

139 Human eggs are

[1] Mesolecithel

[2] Microlecithel

[3] Macrolecithel

[4] Alecithal

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

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

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

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

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

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

Answer: All of these

146 Corpus leteum develops from

[1] Oocyte

[2] Nephrostome

[3] Graafian follicle

[4] None of the above

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

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

Answer: Seminal vesicles

149 Corpus luteum disintegrates due to non-availability of

[1] LTH

[2] FSH

[3] Progesterone

[4] LH

Answer: LH

150 After ovulation, Graafian follicle forms

[1] Corpus luteum

[2] Corpus albicans

[3] Corpus artesia

[4] Corpus callosum

Answer: Corpus luteum

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