This practice test includes Biology (Class 12th ) 25 important questions from the chapter human reproduction.
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Q.1.
Ovulation in the human female normally takes place during the menstrual cycle
- at the mind secretory phase
- just before the end of the secretory phase
- at the beginning of the proliferative phase
- at the end of the proliferative phase
Answer:
(d) at the end of the proliferative phase
Explanation: It takes place at the end of the proliferative phase.
Explanation: It takes place at the end of the proliferative phase.
Q.2.
After ovulation Graafian follicle regreses into
- corpus atresia
- corpus callosum
- corpus luteum
- corpus albicans
Answer:
(c) corpus luteum
Explanation: Graafian follicle regreses into corpus luteum
Explanation: Graafian follicle regreses into corpus luteum
Q.3.
Immediately after ovulation, the mammalian egg is covered by a membrane known as
- chorion
- zona pellucida
- corona radiata
- vitelline membrane.
Answer:
()
Explanation: membrane is known as vitelline membrane.
Explanation: membrane is known as vitelline membrane.
Q.4.
Which one of the following events is correctly matched with the time period in a normal menstrual cycle ?
- Release of egg : 5 th day
- Endometrium regenerates : 5 – 10 days
- Endometrium secretes nutrients for implantation: 11 – 18 days
- Rise in progesterone level : 1 – 15 days
Answer:
(b) Endometrium regenerates : 5 – 10 days
Q.5.
If mammalian ovum fails to get fertilised, which one of the following is unlikely ?
- Corpus luteum will distintegrate.
- Progesterone secretion rapidly declines.
- Estrogen secretion increases.
- Primary follicle starts developing
Answer:
(c) Estrogen secretion increases.
Explanation: Estrogen secretion increases and menstruation occurs
Explanation: Estrogen secretion increases and menstruation occurs
Q.6.
A human female reaches menopause aroung the age of__ yrs
- 50
- 15
- 70
- 25
Answer:
(a) 50
Q.7.
A reaction of granules content which harden the zona pellucida and ensures sure block to polyspermy is
- acrosomal reaction
- cortical reaction
- acrosin reaction
- bindin reaction
Answer:
(b) cortical reaction
Explanation: It is known as cortical reaction.
Explanation: It is known as cortical reaction.
Q.8.
Which part of the sperm plays an important role in penetrating the egg membrane ?
- Allosome
- Tail
- Autosome
- Acrosome
Answer:
(d) Acrosome
Explanation: Acrosome penetrates the egg membrane.
Explanation: Acrosome penetrates the egg membrane.
Q.9.
In oocyte secondary maturation occurs in
- ovary
- abdominal cavity
- Fallopian tube
- uterus.
Answer:
(c) Fallopian tube
Explanation: secondary maturation occurs in Fallopian tube
Explanation: secondary maturation occurs in Fallopian tube
Q.10.
Besides activating the egg another role of a sperm is to carry to egg
- RNA
- mitochondria
- DNA
- ribosomes
Answer:
(c) DNA
Q.11.
Preparation of sperm before penetration of ovum is
- spermiation
- cortical reaction
- spermiogenesis
- capacitation
Answer:
(a) spermiation
Explanation: Preparation of sperm before penetration of ovum is known as spermiation
Explanation: Preparation of sperm before penetration of ovum is known as spermiation
Q.12.
The function of the secretion of prostate gland is to
- inhibit sperm activity
- attract sperms
- stimulate sperm activity
- none of these.
Answer:
(c) stimulate sperm activity
Explanation: secretion of prostate gland is to stimulate sperm activity
Explanation: secretion of prostate gland is to stimulate sperm activity
Q.13.
Lower narrow end of uterus is called
- urethra
- cervix
- clitoris
- vulva
Answer:
(b) cervix
Explanation: Lower narrow end of uterus is called cervix
Explanation: Lower narrow end of uterus is called cervix
Q.14.
Bartholin’s glands are situated
- on the either side of vagina in humans
- on either side of vas deferens in humans
- on either side of penis in humans
- on either side of Fallopian tube in humans
Answer:
(a) on the either side of vagina in humans
Explanation: It is situated on the either side of vagina in humans.
Explanation: It is situated on the either side of vagina in humans.
Q.15.
In human adult females oxytocin
- stimulates pituitary to secrete vasopressin
- causes strong uterine contractions during parturition
- is secreted by anterior pituitary
- stimulates growth of mammary glands
Answer:
(b) causes strong uterine contractions during parturition
Explanation: It causes strong uterine contractions during parturition
Explanation: It causes strong uterine contractions during parturition
Q.16.
The third stage of parturition is called “after-birth”. In this stage
- excessive bleeding occurs
- fetus is bom and cervix and vagina contraction to normal condition happens
- fetus is bom and contraction of uterine wall prevents excessive bleeding
- placenta is expelled out
Answer:
()
Explanation: In this stage placenta is expelled out
Explanation: In this stage placenta is expelled out
Q.17.
spot the odd one out from the following structures with reference to the male reproductive system
- Rate testis
- Epididymis
- Vasa efferentia
- Isthmus
Answer:
(d) Isthmus
Q.18.
In humans, at the end of the first meiotic division, the male germ cells differentiate into the
- spermatids
- spermatogonia
- primary spermatocytes
- secondary spermatocytes
Answer:
(d) secondary spermatocytes
Explanation: It differentiate into secondary spermatocytes
Explanation: It differentiate into secondary spermatocytes
Q.19.
How many sperms are formed from a secondary spermatocyte ?
- 4
- 8
- 2
- 1
Answer:
(c) 2
Q.20.
How many sperms are formed from 4 primary spermatocytes ?
- 4
- 1
- 16
- 32
Answer:
(c) 16
Q.21.
In spermatogenesis, reduction division of chromosome occurs during conversion of
- spermatogonia to primary spermatocytes
- primary spermatocytes to secondary spermatocytes
- secondary spermatocytes to spermatids
- spermatids to sperms
Answer:
(b) primary spermatocytes to secondary spermatocytes
Explanation: It occurs during conversion of primary spermatocytes to secondary spermatocytes
Explanation: It occurs during conversion of primary spermatocytes to secondary spermatocytes
Q.22.
Which of the following groups of cells in the male gonad, represent haploid cells ?
- Spermatogonial cells
- Germinal epithelial cells
- Secondary spermatocytes
- Primary spermatocytes
Answer:
(c) Secondary spermatocytes
Q.23.
The process of release of spermatozoa from Sertoli cells into cavity of the seminiferous tubules is called
- spermiogenesis
- spermatogenesis
- spermatocytogenesis
- spermiation
Answer:
(d) spermiation
Q.24.
Acrosome is a type of
- lysosome
- flagellum
- ribosome
- basal body
Answer:
()
Explanation: Acrosome is a type of lysosome
Explanation: Acrosome is a type of lysosome
Q.25.
At what stage of life is oogenesis initiated in a human female ?
- At puberty
- During menarch
- During menopause
- During embryonic development
Answer:
()
Explanation: It initiates at puberty.
Explanation: It initiates at puberty.
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