Which of the structures shown in the following diagram contributes the source of nutrition for the sperms ejaculated in the semen?
Grey crescent is the area -
At the point of entry of sperm into ovum
Just opposite to the site of entry of sperm into ovum
At the animal pole
At the vegetal pole
If mammalian ovum fails to get fertilized, which one of the following is unlikely -
Estrogen secretion further decreases
Progesterone secretion rapidly declines
Corpus luteum will disintegrate
Primary follicle starts developing
Menstrual bleeding is the result of
low levels of ovarian hormones
In oogenesis, when a diploid cell undergoes meiosis, how many ova result?
1
2
3
4
Identify the incorrectly matched pair:
1.
Ovulation
LH surge
2.
Follicular phase of menstrual cycle
Regeneration of endometrium
3.
Luteal phase
Secretion of FSH
4.
Menstruation
Withdrawal of progesterone
Fructose is contributed to the semen by the secretions of:
Seminal vesicles
Prostate
Bulbourethral glands
Testes
In spermiogenesis, spermatids are formed, while in spermiation spermatozoa are formed.
Question 174
A-2 B-4 C-3 D-1
Seminal plasma in human males is rich in
fructose and calcium
glucose and calcium
DNA and testosterone
ribose and potassium
Identify the incorrect statement regarding female reproductive system?
The first meiotic division of a primary oocyte forms two secondary oocytes that remain in this stage unless fertilization occurs.
Uterine tube, fallopian tube, and oviduct are terms used to refer to the same organ.
Menopause marks the termination of both menstruation and ovulation.
An ectopic pregnancy is an implantation of the blastocyst in a site other than the uterus.
Seminal plasma in humans is rich in
fructose, calcium and certain enzymes
fructose and calcium but has no enzymes
glucose and certain enzymes but has no calcium
fructose and certain enzymes but poor in calcium
Which one of the following is the correct matching of the events occurring during menstrual cycle?
Ovulation-LH and FSH attain peak level and sharp fall in the secretion of progesterone
Proliferative phase-Rapid regeneration of myometrium and maturation of Graafian follicle
Development of corpus luteum-Secretory phase and increased secretion of progesterone
Menstruation-Breakdown of myometrium and ovum not fertilized
During normal menstruation about 40 mL blood is lost
The menstrual fluid can easily clot
At menopause in the female, there is especially abrupt increase in gonadotropic hormones
The beginning of the cycle of menstruation is called menarche
Extrusion of second polar body from egg nucleus occurs:
simultaneously with first cleavage
after entry of sperm but before fertilization
after fertilization
before entry of sprm into ovum
Select the correct sequence for transport of sperm cells in male reproductive system.
Testis → Epididymis → Vasa efferentia → Vas deferens → Ejaculatory duct → Inguinal canal
Testis → Epididymis → Vasa efferentia → Rete testis → Inguinal canal → Urethra
Seminiferous tubules → Rete testis → Vesa efferentia → Epididymus → Vas deferens →
Seminiferous tubules → Vasa efferentia → Epididymis → Inguinal canal → Urethra
The extra embryonic membranes of the mammalian embryo are derived from
Trophoblast
Inner cell mass
Formative cells
Follicle cells
In the 28 day human ovarian cycle, the duration of luteal phase is approximate?
14 days
28 days
30 days
5 days
In the fertile human female, approximately on which day of the menstrual cycle (32 days) does ovulation take place?
Day 18
Day 14
Day 1
Day 8
Which of the following groups of hormones produced in women only during pregnancy ?
hCG, hPL, relaxin
Estrogen, progesterone, hCG
Cortisol, prolactin, thyroxine
Prolactin. progesterone, hCG
Which one of the following statements is incorrect about menstrual cycle ?
The first menstruation begins at puberty and is called menarche
Lack of menstruation may also occur due to some environmental factors like stress, poor health
Corpus luteum secretes large amounts of progesterone which is essential for maintenance of endometrium
In absence of fertilisation, corpus luteum degenerates in luteal phase and new follicles start developing immediately
Phase of menstrual cycle in human that lasts for 7-8 days is
Follicular phase
Ovulatory phase
A change in ovum after penetration of sperm is
Formation of first polar body
Second meiosis starts
First meiosis
Formation of second polar body
What happens to the majority of the follicles during the phase from birth to puberty?
They get invested by multiple layers of granulosa cells
They enlarge in size and then get dormant
They undergo atresia or degeneration
They cluster together at one end of the ovary
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