Sperm activation in female reproductive tract is also known as:
In the female genital tract, some lipid is removed from the sperm surface to make it active or allow easy removal of enzymes known as capacitation.
Capacitation occurs in:
Capacitation occurs in Vagina to remove lipid from the surface of sperm to make it active.
What layer of egg cells prevents entry of other sperms?
The sperm contacts the egg cell at zona pellucida. The zona pellucida then undergoes chemical changes which renders the egg insusceptible to further encounters with another sperm. This is essential to ensure that only a single sperm fertilizes the egg.
The haploid ovum is also called as _____________.
The haploid ovum is formed after the second round of meiosis is completed. This haploid ovum is also called ootid. Oogonium is the egg mother cell that is diploid and undergoes meiosis to form an egg.
Cortical granules release from the ovum to prevent______.
Cortical granule release from ovum due to penetration of one sperm which is responsible for preventing polyspermy.
Enzyme for fertilization present in -
Acrosome of Sperm have enzymes for Sperm wall digestion.
Location of fertilization is -
Fertilization occurs in Ampullary-isthmic region of the fallopian tube.
Image showing fertilization in fallopian tube
What is the correct order of travel of sperm through the female reproductive tract before it reaches the egg?
Sperms are released into the vagina. From here, they travel through the cervix and uterus before reaching the oviduct or fallopian tube, where they can encounter an egg.
Number of meiosis II in female is Equal to -
Total no. of meiosis II is equal to total no. of fertilization.
Which of the following is generally least in number?
Second polar body is the result of meiosis II occuring after fertilization so it least in number.
During a menstrual cycle, copulation on which of the following phases has the least probability of fertilizing an egg?
The menstrual phase is the first phase of the menstrual cycle. This is the part of the cycle when a person has their period.
The cycle starts when the egg from the previous menstrual cycle does not become fertilized. Hormone levels of estrogen and progesterone drop.
Because the thickened uterine lining is not needed, it will break down and shed. This lining and the egg then exit through the vagina during the menstrual period.
Fertilization occurs only when the egg and sperm are present in the ampulla at the same time. Hence the coitus should happen near the period of ovulation. Ovulation occurs at the end of the follicular phase or the onset of luteal phase.
Polyspermy is prevented by:
Polyspermy is prevented by Depolarization of membranes due to entry of sperm leading to influx of Ca+ ions and then cortical granules release to prevent further fusion of sperms.
Which is true about Fertilizin -
Antifertilizin is located on:
Antifertilizin is located on the sperm head which promotes Fertilizin and antifertilizin reaction between sperm and ovum.
The chemical substance called fertilizin performs which of the following function:
The most important significance of fertilizin & antifertilizin reaction is to:
In which of the following fertilization occurs externally in water?
Amphibians produce unfertilized eggsin the outer Lower aquatic species, such as Hydra, fishes, and amphibians, exhibit external fertilisation, whereas higher animal species, such as birds and mammals, exhibit internal fertilisation.environment.
Image showing fertilization in frogs
Fertilization can be correctly defined as fusion of:
Fertilization is defined as a process of fusion of male and female gametes. The gametes are special haploid cells. The most widely accepted definition of species is the biological species- according to which members of same species alone can carry on the process of sexual reproduction (including fertilization) and produce fertile offspring.
Image showing fertilization
Polyspermy is normally prevented by:
The fertilization of the ovum with only one sperm is termed as monospermy and causes the fertilization membrane to prevent the entry of other sperm. So, the correct answer is, 'Formation of fertilization membrane. '.
Ectopic pregnancy can occur in: