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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
Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.
Explain the development of a secondary oocyte (ovum) in a human female from the embryonic stage upto its ovulation. Name the hormones involved in this process.
Answer the following questions in short.
Which precautions will you follow to maintain the reproductive health?
Multiple choice question.
The given figure shows human sperm. Various parts of it are labelled as A, B, C, and D. Which labelled part represents acrosome?
Describe the process of oogenesis in human female.
Give scientific reason.
Older women are more likely to give birth to children with some abnormalities.
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?
If one pollen grain produces two male gametes, how many pollen grains are needed to fertilize 10 ovules?
The glandular accessory organ which produces the largest proportion of semen is ____________.
The process which the sperm undergoes before penetrating the ovum is ____________.
Answer the following type of question Assertion (A) and Reason (R).
(A) - Head of the sperm consists of acrosome and mitochondria.
(R) - Acrosome contains spiral rows of mitochondria.
Define gametogenesis.
Identify the given image and label its parts marked as a, b, c and d
The part labelled as ______ contains the energy source that facilitates sperm motility.
Formation of ____________ is an indication of the termination of oogenesis.
Which is the correct order of steps occurring during spermatogenesis?
The immature male germ cells differentiates into ______ at the end of meiosis I.
What is the location of oogenesis?
In human beings, the largest cell formed during Oogenesis is ______
Extrusion of second polar body from egg nucleus occurs ______.
By which process sperms released from the seminiferous tubules?
The immature male germ cell undergo division to produce sperms by the process of spermatogenesis.
Choose the correct one with reference to the above.
Corona radia is made up of ______.
Cavity of graafian follicle is ______.
Cells of corona radiata remain grouped together by ______.
How many sperms are formed from 4 primary spermatocytes?
Layers of an ovum from outside to inside is ______.
Head of epididymis is called as ______.
The prostate gland and seminal vehicle perform the function of ______.
After the release of the secondary oocyte, the Graafian follicle develops into ______.
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?
Growth hormone of pituitary is more effective in ______.
In human females, meiosis II is not completed until:
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?
Answer the following:
How many primary spermatocytes and oocytes are required for the formation of 100 spermatozoa and ova?
Distinguish between human sperm and ovum.
The diagram given below shows the various steps in spermatogenesis.
- Name the parts labelled '1', '2' and '3'.
- Name the process by which part '3' changes to part '4'.
In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?
