Practice Start Test

Human Reproduction

NEET Biology · 134 questions · Page 13 of 14 · Click an option or "Show Solution" to reveal answer

Q121
In telolecithal egg, the yolk is found
A all over the egg
B on one side
C both the sides
D centre
Correct Answer
Option B
Solution

(b) In telolecithal eggs, most yolk is near the vegetal pole (one side).

Q122
Blastopore is
A closure of neural tube
B opening of gastrocoel
C anterior end of the embryo
D found in blastulae
Correct Answer
Option B
Solution

(b) Blastopore is the small slit-like opening of gastrocoel on the dorsal side of the gastrula.

Q123
Which one of the following is the correct matching of the events occurring during menstrual cycle?
A Proliferative phase: Rapid regeneration of myometrium and maturation of Graafian follicle.
B Development of corpus luteum: Secretory phase and increased secretion of progesterone.
C Menstruation: Breakdown of myometrium and ovum not fertilised.
D Ovulation: LH and FSH attain peak level and sharp fall in the secretion of progesterone.
Correct Answer
Option B
Solution

(b) Corpus luteum develops in secretory (luteal) phase and secretes progesterone.

Q124
What is the correct sequence of sperm formation?
A Spermatogonia, spermatocyte, spermatozoa, spermatid
B Spermatogonia, spermatozoa, spermatocyte, spermatid
C Spermatogonia, spermatocyte, spermatid, spermatozoa
D Spermatid, spermatocyte, spermatogonia, spermatozoa
Correct Answer
Option C
Solution

(c) Spermatogonia → primary spermatocytes → secondary spermatocytes → spermatids → spermatozoa.

Q125
The part of fallopian tube closest to the ovary is
A isthmus
B infundibulum
C cervix
D ampulla
Correct Answer
Option B
Solution

(b) Infundibulum with finger-like fimbriae is closest to the ovary and collects the ovum.

Q126
The main function of mammalian corpus luteum is to produce:
A estrogen only
B progesterone
C human chorionic gonadotropin
D relaxin only.
Correct Answer
Option B
Solution

(b) Main secretory product of corpus luteum is progesterone, required for maintenance of pregnancy.

Q127
Which extra-embryonic membrane in humans prevents desiccation of the embryo inside the uterus?
A Chorion
B Allantois
C Yolk sac
D Amnion
Correct Answer
Option D
Solution

(d) Amnion is an extraembryonic membrane in human prevents desiccation of the embryo inside the uterus.

Amnion is a membrane that encloses the embryo of reptiles, birds and mammals within the amniotic cavity.

This cavity is filled with amniotic fluid, in which the embryo is protected from dessication and external pressure.

Amniocentesis is a prenatal procedure which is recommended by doctor during pregnancy.

The test checks for fetal abnormalities (birth defects) such as Down syndrome, cystic fibrosis or spina bifida.

This test is performed between 16 and 20 weeks of the pregnancy.

Q128
Seminal plasma in human males is rich in:
A fructose and calcium
B glucose and calcium
C DNA and testosterone
D ribose and potassium
Correct Answer
Option A
Solution

(a) Seminal plasma is rich in fructose, calcium and enzymes providing nutrition and transport for sperms.

Q129
During cleavage, what is true about cells?
A Nucleocytoplasmic ratio remains unchanged
B Size does not increase
C There is less consumption of oxygen
D The division is like meiosis
Correct Answer
Option B
Solution

(b) During cleavage size of cells do not increase (in fact the resultant blastomeres are smallest in size, because size of embryo doesn't increase and mitosis occurs repeatedly).

Q130
Egg is liberated from ovary in
A secondary oocyte stage
B primary oocyte stage
C oogonial stage
D mature ovum stage
Correct Answer
Option A
Solution

(a) Ovulation releases the secondary oocyte (meiosis II arrested at metaphase).

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