Immediately after ovulation, the ovum is covered by a membrane called
Chorion
Zona pellucida
Corona radiata
Vitelline membrane
Correct Answer :
B. Zona pellucida
Related Questions
What happens during fertilization when many sperms reach close to ovum ....
Cells of corona radiata trap all the sperm except one
Only two sperms nearest to ovum penetrate zona pellucida
Secretion of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
All sperms except the one nearest to ovum lose their tails
What is Hirsuitism in females? (Usually with Poly cystic ovarian disease)
Unusually tall
Abnormal growth of facial and body hair
Abnormal voice
Short stature
Part of sperm that passes into ovum is
Tail
Acrosome
Head
Head, neck and middle piece
Third phase of embryo development is ...
Cleavage
Fertilization
Gametogenesis
Gastrulation
The hormone responsible for enlargement of mammary glands at puberty is
Progesterone
Oestrogen
Testosterone
Oxytocin
Chorionic gonadotropin is secreted by ...
Pituitary
Ovary
Placenta
Uterus
Haemophilic man marries a normal woman. Their off springs will be
All haemophilic
All boys haemophilic
All girls haemophilic
All normal
The number of chromosomes present in sperms
46
23
23 + X
23+ Y
Which one occurs first in the human embryo
Neurogenesis
Cardiogenesis
Hepatogenesis
Osteogesis
Correct sequence in embryonic development is ..
Fertilization -> zygote -> cleavage -> morula -> blastula -> gastrula
Fertilization -> zygote -> cleavage -> blastula -> morula -> gastrula
Fertilization -> zygote -> cleavage -> morula -> blastula -> gastrula
Fertilization -> zygote -> gastrulae -> morula -> blastula -> cleavage
Human placenta is
Endothelial
Haemochorial
Epitheliochorial
Syndesmochorial
Human embryo is referred to as fetus from beginning of
1st month of pregnancy
2nd month of pregnancy
3rd month of pregnancy
4th month of pregnancy
A genetically diseased father (male) marries with a normal female and gives birth to 3 carrier girls and 5 normal sons. Find out the type of genetic disease.
Sex-influenced disease
Blood group inheritance disease
Sex-linked disease
Sex-recessive disease
Failure of the brain to grow in the foetus may result in:
Plagiocephaly
Craniostenosis
Anencephaly
Microcephaly
In infertility treatment the ovum is fertilized outside the body and injected into the uterus
Gamete intra fallopian transfer
Invitro fertilization
Intra uterine insemination
Zygote intra fallopian transfer
The pre fertilisation process stage of sperm before entry into the ovum is called as
Maturation
Insemination
Capacitation
Fertilization
Amniotic fluid protects the foetus from ...
Shock
Abortion
Degeneration
Disease
The number and appearance of chromosomes in the nucleus of a eukaryotic cell is called as
Karyotype
Genotype
Phenotype
Cytogenetics
Mongolian idiocy due to trisomy in 21st chromosome is known as
Downs syndrome
Turners syndrome
Klinefelters syndrome
Triple x syndrome
HCG, HPL and relaxin are produced in women ...
At puberty
During pregnancy
Before puberty
At menopause
The gonadotropic hormones are secreted by
Anterior pituitary
Posterior pituitary
Adrenals
Ovaries
Which part of the ovary act as an endocrine gland in human beings
Stroma
Vitteline membrane
Graffian follicle
Epithelium
Approximately how long does it take for a spermatocyte to complete its differentiation into a spermatozoan in the testis?
7 days
70 days
7 months
70 hours
Medical termination of pregnancy is safe till how many weeks of pregnancy?
10 weeks
12 weeks
20 weeks
22 weeks
At the end of meiosis I, the Oocyte yields
Secondary Oocyte and first polar body
First polar body
Secondary Oocyte
Second polar body
Villi of human placenta develop from ..
Chorion
Allantois
Yolk sac
Amnion
Ovulation occurs under the influence of high titre of
LH
FSH
Estrogen
Progesterone
Number of chromosomes in secondary oocyte stage in humans is ...
23
46
18
20
Part of fallopian tube closest to ovary is
Infundibulum
Cervix
Ampulla
Isthmus
Embryonic connective tissue is formed from ..
ectoderm
endoderm
Mesenchyme
Mesogloea