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प्रश्न
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'.
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उत्तर
- 1: Primary spermatocytes.
2: Secondary spermatocytes.
3: Spermatids. - The process of forming spermatozoa (4) from spermatids (3) is called spermiation.
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संबंधित प्रश्न
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.
At what stage of development are the gametes formed in newborn male and female?
Complete the analogy.
1 primary spermatocyte : 4 spermatozoa :: 1 primary oocyte : ____________.
How many sperms are formed from 4 primary spermatocytes?
Which one is released from the ovary?
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?
What is spermatogenesis?
Sketch and label the process of oogenesis.
Distinguish between human sperm and ovum.
