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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.
46
In oogenesis which cell body are concentrated in cytoplasm of primary oocyte of the growth phase ?
[1]
Mitochondrial
[2]
Golgicomplex
[3]
Ribosomes
[4]
Above all
47
Which period is of the cycle is known as a proliferative phase ?
[1]
1 to 5 days
[2]
15 to 28 days
[3]
6 to 14 days
[4]
14 to 15 days
48
After fertilization which changes prevents entry of other sperms in to the oocytes
[1]
Egg membrane
[2]
Vitelline membrane
[3]
Fertilization membrane
[4]
(1) and (3) both
Answer: Fertilization membrane
49
What time period is required to form blastocyst ?
[1]
One week
[2]
8 days
[3]
two week
[4]
9 days
50
In human normally what is the period of pregnancy ?
[1]
266 days
[2]
280 days
[3]
270 days
[4]
275 days
51
In humans embryonic development chorionicvilli which co-operate with the tissue of the mothers uterus to forms ...
[1]
Placenta
[2]
Umbilical cord
[3]
Embryonic disc
[4]
Amniotic cavity
52
At the time of delivery which hormones stimulate more frequent and powerful construction of the
uterus ?
[1]
Oxytocin and Prostaglandins
[2]
Estrogen and Progesterone
[3]
Oxytocin and Vasopressin
[4]
Estrogen and Prostaglandins
Answer: Oxytocin and Prostaglandins
53
Which pair is not correct ?
[1]
teste - scrotalsac
[2]
ovary - upper pelvic cavity
[3]
vas deferens - ejaculatory duct
[4]
Fallopion tube - Ovulation
Answer: Fallopion tube - Ovulation
54
The semini ferous tubules of the testies are lined bye the germinal epithelium consisting...
[1]
Cells of sertoli
[2]
Spermatocytes
[3]
Spermatogonium
[4]
Spermatids
55
In oogenesis diploid cell produce _______ ovum.
56
The correct order of the changes in hormones level at first day to 28th day of menstrual cycle.
[1]
estrogen and progesterone level is lower --> Estrogen rising --> Progesterone rising.
[2]
estrogen and progesterone level is higher --> Estrogen lower --> Progesterone rising.
[3]
estrogen and progesterone level is lower --> Estrogen rising --> Progesterone lower.
[4]
estrogen and progesterone level is higher --> Estrogen rising --> Progesterone rising.
Answer: estrogen and progesterone level is lower --> Estrogen rising --> Progesterone rising.
57
Function of the placenta is ..
[1]
to deliver nutrients to embryo
[2]
to deliver oxygen to embryo
[3]
remove wastes from the embryonic blood
[4]
all of these
58
The fluid within the blastocyst is formed by the cells of _______ ?
[1]
Trophoblast
[2]
Blastomere
[3]
None of this
[4]
Iner layer of blastocyte
59
In menstrual cycle on which days rises progesterone levels ?
[1]
1 to 5 days
[2]
6 to 14 days
[3]
14 to 15 days
[4]
15 to 28 days
60
When sperm penetrate secondary oocyte during its unequal meioticdivision, how many polar body (bodies) is are produced ?
[1]
One
[2]
Two
[3]
Three
[4]
None of this
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