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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.
76
The ovaries maintain their position by ....
[1]
Series of ligaments
[2]
Muscular filament
[3]
Epithelium layer
[4]
Connective leyer
Answer: Series of ligaments
77
Ovarian stroma is composed by ..... ?
[1]
Cortex
[2]
Medulla
[3]
Follicles
[4]
(1) and (2) both
78
Which hormones is produced by corpus luteum ?
[1]
Estrogen
[2]
Testosterone
[3]
Progesterone
[4]
(1) and (2) both
79
The distal narrow end of the uterus is called........
[1]
Vagina
[2]
Cervix
[3]
Hymen
[4]
(1) and (3) both
80
What is called the process of gamete formation in the sexually reproducing animals ?
[1]
Spermatogenesis
[2]
Oogenesis
[3]
Gametogenesis
[4]
None of this
81
In spermatogenesis which cells are produced at the end of the maturation phase ?
[1]
Primary spermatocyte
[2]
Spermatogonia
[3]
Secondary spermatocyte
[4]
Spermatids
82
These form a middle piece of the sperm
[1]
Mitochondria
[2]
Golgicomplex
[3]
Ribosomes
[4]
Nucleus
83
Which stage of cell at the time of ovulation ?
[1]
Secondary oocyte
[2]
First polar body
[3]
Secondary polar body
[4]
Primary oocyte
84
In menstrual cycle on which day ovulation occurs ?
[1]
on 12th day
[2]
on 13th day
[3]
on 14th day
[4]
on 15th day
85
The sperms emptied in the vagina start moving towards oviducts through the uterus which is helpful in their locomotion
[1]
Contraction of uterine wall
[2]
The slimy secretion of oviduct wall
[3]
Contraction vagina passage
[4]
All of these
86
Which cells secrete the enzymes for make implantation of embryo possible ?
[1]
Trophoblast
[2]
Blastomere
[3]
Outer layer of blastocyst
[4]
Outer layer of uterus
87
Which hormones are not produced by placenta ?
[1]
hcG
[2]
hpL
[3]
estrogens
[4]
relaxin
88
After delivery mammary gland start producing milk, In milk which necessary substance is present for immunity ?
[1]
Lactose
[2]
Protein
[3]
Fat
[4]
Antibodies
89
Which of the follwing is an accessory reproductive gland in male mammals.
[1]
Prostate gland
[2]
Gastric gland
[3]
Mushroom shaped gland
[4]
Inguinal gland
90
In the absence of acrosome the sperm _______.
[1]
Cannot get food
[2]
Cannot penetrate the egg
[3]
Cannot swim
[4]
Cannot get energy
Answer: Cannot penetrate the egg
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