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प्रश्न
The fusion of the male and the female gametes is called ______.
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उत्तर
The fusion of the male and the female gametes is called fertilisation.
Explanation:
The process of fusion of a sperm with an ovum is called fertilisation. During fertilisation, a sperm comes into contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms. Thus, it ensures that only one sperm can fertilise an ovum.
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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:
- Acrosome
- Nucleus
- Middle piece
The process of release of the ovum from a mature follicle is called ______.
Ovulation is induced by a hormone called ______.
What is oogenesis?
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.
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.
Mention the differences between spermiogenesis and spermatogenesis.
At what stage of development are the gametes formed in newborn male and female?
Draw a labeled sketch of a spermatozoan.
Extrusion of second polar body from egg nucleus occurs ______.
The nutritive cells found in seminiferous tubules are ______.
Acrosome is a type of ______.
Layers of an ovum from outside to inside is ______.
Which of the following is a primary sex organ of female?
Select the correct sequence of stages of spermatogenesis in a human male ______.
In the process of fertilization, this is true:
The number of chromosome groups at the equatorial plate in metaphase-I of meiosis in a plant with 2n = 50 shall be:
Which type of cell division forms spermatids from the secondary spermatocytes?
How many spermatozoa are formed from one secondary spermatocyte?
In spermatogenesis, at the end of the first meiotic division ______ are formed.
Given below are two statements.
- Statement I: The spermatids are non-motile and non-functional which get transformed into functional spermatozoa by the process of spermiogenesis.
- Statement II: During the process of this change, the spermatids remain held to each other and to Leydig's cells by cytoplasmic bridges.
In light of the above statements, select the correct answer from the option given below.
What is spermatogenesis?
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'.
Draw a labelled diagram of a section through the ovary.
