Thick layer which surrounds the ovum is ...
Zona pellucida
Membrana granulosa
Corona radiata
Theca interna
Correct Answer :
A. Zona pellucida
Related Questions
The three primary germ layers, ectoderm, endoderm and mesoderm are differentiated during
Blastulation
Neurulation
Gastrulation
Organogenesis
Fertilization of the ovum takes place in
Ovary
Uterus
Fallopian tube ampulla
Cervix
In a 28 day menstrual cycle, ovulation occurs on ...
Day 1
Day 5
Day 14
Day 28
In a semen analysis, the following is not acceptable as normal�
25 % abnormal forms
60% motility after 3 hours
Mild Alkaline reaction
Sperm count of 17 million per ml.
Pregnancy begins with implantation of
Embryo
Fertilized ovum
Blastopore
Blastocyst
A child's blood group is 'o'. The parent's blood groups cannot be
A AND B
A AND A
AB AND O
B AND O
The gonadotropic hormones are secreted by
Anterior pituitary
Posterior pituitary
Adrenals
Ovaries
Embryo at 16-celled stage is called ...
Morula
Blastula
Blastomere
Gastrula
Which layer of embryo is formed first
ectoderm
Mesoderm
Endoderm
Mesenchyma
The middle piece of the sperm contains
Protein
Nucleus
Mitochondria
Centriole
Mongolian idiocy due to trisomy in 21st chromosome is known as
Downs syndrome
Turners syndrome
Klinefelters syndrome
Triple x syndrome
Total numbers of ovum released in the life time of a woman is approximately
40
400
4000
20000
What is Hirsuitism in females? (Usually with Poly cystic ovarian disease)
Unusually tall
Abnormal growth of facial and body hair
Abnormal voice
Short stature
At the end of meiosis I, the Oocyte yields
Secondary Oocyte and first polar body
First polar body
Secondary Oocyte
Second polar body
Third phase of embryo development is ...
Cleavage
Fertilization
Gametogenesis
Gastrulation
Which cells provide nutrition to the sperms?
Sertoli cells
Leydig cells
Crypt cells
Semniferous tubules
When there is no fertilization, the corpus luteum ...
Stops secreting progesterone
Changes to corpus albicans
Starts producing progesterone
Begins next cycle
Immediately after ovulation, the ovum is covered by a membrane called
Chorion
Zona pellucida
Corona radiata
Vitelline membrane
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
Acrosome occurs in the sperm in
Tail part
Behind the nucleus
Middle piece
Tip
The first milk which comes out just after child birth is known as .
Colostrum
Prolactin
Hind milk
Lactogen
Sertoli cells are found in
Seminiferous tubules
Ovaries
Prostate gland
Semen
Layers of ovum from outside to inside are .
Corona radiata, zona pellucida, vitelline membrane
Zona pellucida, corona radiata, vitelline membrane
Vitelline membrane, zona pellucida, corona radiata
Zona pellucida, vitelline membrane, corona radiate
HCG, HPL and relaxin are produced in women ...
At puberty
During pregnancy
Before puberty
At menopause
The male hormone testosterone is secreted by
Sertoli cells
Leydig cells
Crypt cells
Semniferous tubules
Cell division that occurs in zygote is called
meiosis
Mitosis
Cleavage
Differentiation
In humans female ovulation occurs during menstrual cycle
At the end of proliferative phase
At the beginning of proliferative phase
Before the end of secretary phase
In the middle of secretary phase
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
Gestation period of 280 days is calculated from time of ...
Last menstruation
Fertilization
First day of last menstruation
Ovulation