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प्रश्न
Explain two main process in sexual reproduction.
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उत्तर
Two main processes involved in sexual reproduction:
- Gamete formation: In this, meiotic division occurs due to which chromosome number is reduced to half. As a result, haploid gametes are formed (2n → n).
- Fertilization: Haploid male gamete (n) fuses with the haploid female gamete (n) to form a diploid zygote (2n).
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संबंधित प्रश्न
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions
(a) Acrosome
(b) Nucleus
(c) Middle piece
The process of release of the ovum from a mature follicle is called ______.
Briefly describe the process of spermatogenesis.
Describe the process of spermatogenesis with the help of diagram.
At the time of birth, there are _______________ oocytes in the ovary of a female foetus.
Give a schematic representation of spermatogenesis and oogenesis in humans.
Complete the analogy.
1 primary spermatocyte : 4 spermatozoa :: 1 primary oocyte : ____________.
Which of the following enter the maturation phase of oogenesis?
Which is the correct order of steps occurring during spermatogenesis?
Find out the CORRECT sequence of spermatogenesis.
Select the pair of cells which does not divide further by mitosis.
Extrusion of second polar body from egg nucleus occurs ______.
Gray crescent is the area ______.
The principal tail piece of human sperm shows the microtubular arrangement of ______.
After the release of the secondary oocyte, the Graafian follicle develops into ______.
Sperms can be stored for several years in liquid nitrogen with a temperature of ______.
Growth hormone of pituitary is more effective in ______.
Germ cells present in the seminiferous tubules undergo ______
How many primary oocytes produce one oogonia?
