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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Human Reproduction of Biology.
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
139
Human eggs are
[1]
Mesolecithel
[2]
Microlecithel
[3]
Macrolecithel
[4]
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
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
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
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
149
Corpus luteum disintegrates due to non-availability of
[1]
LTH
[2]
FSH
[3]
Progesterone
[4]
LH
150
After ovulation, Graafian follicle forms
[1]
Corpus luteum
[2]
Corpus albicans
[3]
Corpus artesia
[4]
Corpus callosum
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