Biology - Human Reproduction Multiple Choice Questions (MCQs) for Class 12 NCERT

Questions

106 The fertilized ovum during the first 12 weeks is called _______.

1 Embryo

2 Foetus

3 Blastocyte

4 (1) & (2) both

View Answer

Answer: Embryo

107 The signals for parturition originate from ______ .

1 Fully developed foetus

2 placenta

3 Uterus

4 (1) & (2) both

View Answer

Answer: (1) & (2) both

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108 During delivery which glands send signals for the release of oxytocin ?

1 Posterior Pituitary

2 Hypothalamus

3 Anterior Pituitary

4 None of these

View Answer

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.

View Answer

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

View Answer

Answer: Semini ferous tubules

111 How many secondary spermatocyte will be required to form 400 spermatozoans.

1 100

2 200

3 400

4 40

View Answer

Answer: 200

112 1^st polar body is formed at which stage of oogenisis

1 1^st Meiosis

2 2^nd Mitosis

3 1^st Mitosis

4 Differentiation

View Answer

Answer: 1^st Meiosis

113 The embryo with 16 cells is called........

1 Blastocyst

2 Blastomeres

3 Morula

4 Cleavage

View Answer

Answer: Morula

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

View Answer

Answer: Cleavage

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.

View Answer

Answer: 5 to 6 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

View Answer

Answer: 1 to 5 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

View Answer

Answer: Primary oocyte

118 Name the process involve in multiplication phase of spermatogenesis ?

1 Mitotic

2 Meiosis

3 Amitosis

4 (1) and (2) both

View Answer

Answer: Mitotic

119 It is a fold at the distal end of the vagina ...

1 Hymen

2 Mucosal membrane

3 Cervix

4 Clitoris

View Answer

Answer: Mucosal membrane

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

View Answer

Answer: Between the urinary bladder and rectum

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