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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.
106
The fertilized ovum during the first 12 weeks is called _______.
[1]
Embryo
[2]
Foetus
[3]
Blastocyte
[4]
(1) & (2) both
107
The signals for parturition originate from ______ .
[1]
Fully developed foetus
[2]
placenta
[3]
Uterus
[4]
(1) & (2) both
108
During delivery which glands send signals for the release of oxytocin ?
[1]
Posterior Pituitary
[2]
Hypothalamus
[3]
Anterior Pituitary
[4]
None of these
Answer: Posterior Pituitary
109
Which option is incorrect for the centriole function in spermiogenesis ?
[1]
The two centrioles of the spermatids
[2]
The antrior one is known as proximal centriole
[3]
One is known as distal centriole
[4]
The distal centriole changes into the tail.
Answer: The distal centriole changes into the tail.
110
Sperms cells are produced in
[1]
Interstitial space
[2]
Semini ferous tubules
[3]
Epididymis
[4]
Prostate gland
Answer: Semini ferous tubules
111
How many secondary spermatocyte will be required to form 400 spermatozoans.
[1]
100
[2]
200
[3]
400
[4]
40
112
1st polar body is formed at which stage of oogenisis
[1]
1st Meiosis
[2]
2nd Mitosis
[3]
1st Mitosis
[4]
Differentiation
113
The embryo with 16 cells is called........
[1]
Blastocyst
[2]
Blastomeres
[3]
Morula
[4]
Cleavage
114
During movement of zygote into oviduct the division of zygote in 2 to 16 daughter cells. This process called
[1]
Cleavage
[2]
Gastrulation
[3]
Morula
[4]
(1) and (2) both
115
What time is taken by the sperm emptied in vagina, to move toward uterus ?
[1]
4 to 5 hrs
[2]
5 to 6 hrs
[3]
3 to 4 hrs
[4]
2 to 3 hrs.
116
In menstrual cycle which period is known as menstrual phase ?
[1]
1 to 5 days
[2]
15 to 28 days
[3]
6 to 14 days
[4]
14 to 15 days
117
In oogenesis which cells are produced at the end of maultiplication phase ?
[1]
Primary oocyte
[2]
Secondary polar body
[3]
Secondary oocyte
[4]
First polar body
118
Name the process involve in multiplication phase of spermatogenesis ?
[1]
Mitotic
[2]
Meiosis
[3]
Amitosis
[4]
(1) and (2) both
119
It is a fold at the distal end of the vagina ...
[1]
Hymen
[2]
Mucosal membrane
[3]
Cervix
[4]
Clitoris
120
Where is uterus situated ?
[1]
Between the urinary bladder and rectum
[2]
Between the urinary bladder and ovary
[3]
Between the urinary bladder and urethra
[4]
Between the urinary bladder and intestine
Answer: Between the urinary bladder and rectum
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