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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
With the help of diagrammatic representation, explain the process of gametogenesis
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions:
- Acrosome
- Nucleus
- Middle piece
The following is the illustration of the sequence of ovarian events (a − i) in a human female
(i) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
(ii) Name the ovarian hormone and the pituitary hormone that have caused the above mentioned event.
(iii) Explain the changes that occur in the uterus simultaneously in anticipation.
(iv) Write the difference between ‘c’ and ‘h’.
(v) Draw a labeled sketch of the structure of a human ovum prior to fertilization.
Male and female gametes are ______.
Describe the process of budding in hydra.
Describe the process of oogenesis in human female.
Describe the process of spermatogenesis with the help of diagram.
In meiosis, the number of chromosomes becomes ___________.
If newborns are produced at the age of menopause, they may be with some abnormalities. Why?
In angiosperms, the pollen germinates to produce a pollen tube that carries two gametes. What is the purpose of carrying two gametes when a single gamete can fertilize the egg?
The male sex hormone testosterone is secreted from ____________.
The glandular accessory organ which produces the largest proportion of semen is ____________.
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.
Complete the analogy.
1 primary spermatocyte : 4 spermatozoa :: 1 primary oocyte : ____________.
Which of the following enter the maturation phase of oogenesis?
Identify the labels (i-iv) in the given diagram of the ovum.
Identify the longest period of menstrual cycle.
Identify the enzyme released by the sperm which has lytic activity.
The immature male germ cells differentiates into ______ at the end of meiosis I.
Which of the following is diploid?
Draw a labelled diagram of a Graafian Follicle.
How many sperms are formed from a secondary spermatocyte?
Which of the following contains a fluid filled cavity called antrum?
The immature male germ cell undergo division to produce sperms by the process of spermatogenesis.
Choose the correct one with reference to the above.
The cell which undergoes meiosis I during spermatogenesis is the ______.
Cavity of graafian follicle is ______.
Cells of corona radiata remain grouped together by ______.
A reaction of granules content which harden the zona pellucida and ensures sure block to polyspermy is ______.
In spermatogenesis, reduction division of chromosome occurs during conversion of ______.
The process of release of spermatozoa from Sertoli cells into cavity of the seminiferous tubules is called ______.
The principal tail piece of human sperm shows the microtubular arrangement of ______.
Which of the following is a primary sex organ of female?
Which of the following are called dual gland?
Mark the odd one.
How many spermatozoa are formed from one secondary spermatocyte?
Draw a neat and labelled diagram of spermatogenesis.
Answer the following:
How many primary spermatocytes and oocytes are required for the formation of 100 spermatozoa and ova?
At the onset of puberty, gonadotropin releasing hormone is secreted by ______.
What are the two main types of gametogenesis based on the organ in which they occur?
