The three primary germ layers, ectoderm, endoderm and mesoderm are differentiated during
Blastulation
Neurulation
Gastrulation
Organogenesis
Correct Answer :
C. Gastrulation
Related Questions
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
Chorionic gonadotropin is secreted by ...
Pituitary
Ovary
Placenta
Uterus
Embryonic connective tissue is formed from ..
ectoderm
endoderm
Mesenchyme
Mesogloea
Villi of human placenta develop from ..
Chorion
Allantois
Yolk sac
Amnion
Part of sperm that passes into ovum is
Tail
Acrosome
Head
Head, neck and middle piece
At the end of meiosis I, the Oocyte yields
Secondary Oocyte and first polar body
First polar body
Secondary Oocyte
Second polar body
Which part of the ovary act as an endocrine gland in human beings
Stroma
Vitteline membrane
Graffian follicle
Epithelium
The middle piece of the sperm contains
Protein
Nucleus
Mitochondria
Centriole
HCG, HPL and relaxin are produced in women ...
At puberty
During pregnancy
Before puberty
At menopause
Embryo at 16-celled stage is called ...
Morula
Blastula
Blastomere
Gastrula
Which layer of embryo is formed first
ectoderm
Mesoderm
Endoderm
Mesenchyma
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
When is the best time to get FSH levels checked?
Day 7 of the menstrual cycle
Day 21 of the menstrual cycle
Day 3 of the menstrual cycle
Day 14 of the menstrual cycle
The surgical method of contraception in males
Hysterectomy
Vasectomy
Castration
Circumcision
The functional unit of testis of man is ...
Uriniferous tubules
Malpighian tubules
Seminiferous tubules
Acini or lobules
In menstrual cycle the secretory phase is also known as
luteal phase and lasts for 6 days
Luteal phase and lasts for 13 days
Follicular phase and lasts for 13 days
Follicular phase and lasts for 6 days
The pre fertilisation process stage of sperm before entry into the ovum is called as
Maturation
Insemination
Capacitation
Fertilization
Cri-du-chat syndrome in humans is caused by the
Trisomy of 21st chromosome
Fertilization of an xx egg by a normal y-bearing sperm
Loss of half of the short arm of chromosome 5
Loss of half of the long arm of chromosome 5
Acrosome of sperm contains ...
Hyaluronidase and acrosin
Hyaluronic acid and acrosin
Hippuric acid and uric acid
Testosterone
Human eggs are
Mesolecithel
Microlecithel
Macrolecithel
Alecithel
Correct sequence of hormone secretion from beginning of menstruation is ...
FSH, progesterone, estrogen
Estrogen, fsh, progesterone
FSH, estrogen, progesterone
Estrogen, progesterone, FSH
The male hormone testosterone is secreted by
Sertoli cells
Leydig cells
Crypt cells
Semniferous tubules
Highly sophisticated procedure of injecting sperm directly into the ovum is
GIFT
ZIFT
ICSI
IUI
The number and appearance of chromosomes in the nucleus of a eukaryotic cell is called as
Karyotype
Genotype
Phenotype
Cytogenetics
Tunica albuginea is related to
Prostate gland
Pituitary gland
Hypothalamus
Testes
Which of the following statements is most correct about the human menstrual cycle.
The menstrual cycle in all women is a 28 day cycle
Ovulation always occurs at the midpoint of the menstrual cycle
A high body temperature indicates ovulation is occurring
The menstrual cycle is an endocrine cycle regulating reproductive physiological changes
Which of the following is not a hereditary disease?
Cystic fibrosis
Thalassaemia
Haemophilia
Cretinism
The number of chromosomes present in sperms
46
23
23 + X
23+ Y
Amniotic fluid protects the foetus from ...
Shock
Abortion
Degeneration
Disease
After ovulation graffian follicles turns into
Corpus luteum
Corpus albicans
Corpus callosum
Corpus artesia