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प्रश्न
What is spermatogenesis?
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उत्तर
Spermatogenesis is the process by which male spermatogonia develop into adult male gametes called spermatozoa. It begins at puberty and usually lasts until death, with only a tiny decline in the amount of sperm produced as age increases.
संबंधित प्रश्न
Women are often blamed for producing female children. Consequently, they are ill-treated and ostracized. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?
Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.
The process of release of the ovum from a mature follicle is called ______.
______ type of reproduction occurs without fusion of gametes.
Which precautions will you follow to maintain the reproductive health?
What is gamete formation?
Give scientific reason.
Older women are more likely to give birth to children with some abnormalities.
Answer the following type of question Assertion (A) and Reason (R).
(A) - In human males, testes are extra-abdominal and lie in scrotal sacs.
(R) - Scrotum acts as a thermoregulator and keeps the temperature lower by 2°C for normal sperm production.
Give a schematic representation of spermatogenesis and oogenesis in humans.
During spermatogenesis, spermatogonium grows in size to become ______.
Which of the following enter the maturation phase of oogenesis?
Identify the labels (i-iv) in the given diagram of the ovum.
Formation of ____________ is an indication of the termination of oogenesis.
Which of the following occurs during maturation phase of spermatogenesis?
500 spermatozoa are formed from ____________ secondary spermatocytes.
Calculate the number of sperms and ova produced from 40 primary spermatocytes and 40 primary oocytes.
Four primary spermatocytes give rise to ______.
Select the pair of cells which does not divide further by mitosis.
Extrusion of second polar body from egg nucleus occurs ______.
After ovulation, Graafian follicle regresses into ______.
Which of the following stage of oogenesis forms a membrane called zona pellucida surrounding it?
Which of the following contains a fluid filled cavity called antrum?
At the time of organogenesis, genes regulate the process at different levels and at different time due to ______.
During embryonic development, the establishment of polarity along anterior/posterior, dorsal/ventral or medial/lateral axis is called ______.
The nutritive cells found in seminiferous tubules are ______.
How many sperms are formed from 4 primary spermatocytes?
Which of the following contains the actual genetic part of a sperm?
At what stage of life is oogenesis initiated in a human female?
Which one is released from the ovary?
During oogenesis, each diploid cell produces ______.
Head of epididymis is called as ______.
Select the correct sequence of stages of spermatogenesis in a human male ______.
Sperms can be stored for several years in liquid nitrogen with a temperature of ______.
Fetal sex can be determined by examining cells from amniotic fluid looking for:
During reproduction, the chromosome number (2n) reduces to half (n) in the gametes and again the original number (2n) is restored in the offspring. What are the processes through which these events take place?
Which type of cell division forms spermatids from the secondary spermatocytes?
Draw a neat and labelled diagram of spermatogenesis.
Process of maturation and development of sperms ______.
Select a correct pair of cells with identical set of chromosomes.
