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प्रश्न
Briefly describe the process of spermatogenesis.
Explain the process of spermatogenesis in humans.
उत्तर
Spermatogenesis is the process of producing spermatogonia from the germinal epithelium (primordial germ cells) via mitosis (multiplication phase). Finally, they stop going through mitosis and mature into primary spermatocytes (growth phase). Each spermatocyte passes through meiosis (the maturation process). The first maturation division is reductional, resulting in two secondary spermatocytes. The latter divides by equational division (second maturation division) to produce four haploid spermatids. Sertoli cells nourish spermatids, which then produce sperms. This process is known as spermiogenesis. During this process, one spermatogonium generates four sperms with half the amount of chromosomes.
संबंधित प्रश्न
Give the name and function for ‘A’ and ‘B’ from the diagram given below
With the help of diagrammatic representation, explain the process of gametogenesis
How is 'oogenesis' markedly different from 'spermatogenesis' with respect to the growth till puberty in the humans?
The fusion of the male and the female gametes is called __________.
Define spermiogenesis.
Define spermiation.
What is oogenesis? Give a brief account of oogenesis.
Name the functions - Acrosome of sperm.
Body breaks up into several fragments and each fragment starts to live as a new individual. This is ______ type of reproduction.
Give scientific reason.
There is a menopause when women are 45-50 years old.
If one pollen grain produces two male gametes, how many pollen grains are needed to fertilize 10 ovules?
Sex organs produce gametes which are diploid.
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.
Describe the structure of the human ovum with a neat labelled diagram.
Identify the given image and label its parts marked as a, b, c and d
Expand the acronym.
hCG
Which of the following are known as the nourishing cells present in the seminiferous tubules?
Identify the proper order of spermatogenesis and choose the correct option.
Identify the CORRECT sequence of events.
Identify the enzyme released by the sperm which has lytic activity.
First meiotic division is observed in ____________.
______ undergoes 2nd meiotic division during spermatogenesis.
Draw a labelled diagram of a Graafian Follicle.
The human male gamete is usually about ______ in length.
Acrosome reaction in sperm is triggered by ______.
Which among the following has 23 chromosomes?
Besides activating the egg another role of a sperm is to carry ______ to egg.
Preparation of sperm before penetration of ovum is ______.
The head of the epididymis at the head of the testis is called ______.
Layers of an ovum from outside to inside is ______.
Observe the given figure and answer the questions that follow.
- Label A and B.
- Identify the process.
- What happens during the process and what is formed?
The spermatogonia undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.
Which type of cell division forms spermatids from the secondary spermatocytes?
