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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
The process of release of the ovum from a mature follicle is called ______.
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.
In case of sexual reproduction, newborn show similarities about characters. Explain this statement with suitable examples.
At the time of birth, there are _______________ oocytes in the ovary of a female foetus.
Sex organs produce gametes which are diploid.
The male sex hormone testosterone is secreted from ____________.
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.
During spermatogenesis, spermatogonium grows in size to become ______.
Complete the analogy.
1 primary spermatocyte : 4 spermatozoa :: 1 primary oocyte : ____________.
500 spermatozoa are formed from ____________ secondary spermatocytes.
Calculate the number of sperms and ova produced from 40 primary spermatocytes and 40 primary oocytes.
Draw a labelled diagram of a Graafian Follicle.
Which of the following stage of oogenesis forms a membrane called zona pellucida surrounding it?
The immature male germ cell undergo division to produce sperms by the process of spermatogenesis.
Choose the correct one with reference to the above.
Which among the following has 23 chromosomes?
Cavity of graafian follicle is ______.
A reaction of granules content which harden the zona pellucida and ensures sure block to polyspermy is ______.
Besides activating the egg another role of a sperm is to carry ______ to egg.
Preparation of sperm before penetration of ovum is ______.
Layers of an ovum from outside to inside is ______.
What does the figure represent?
Capacitation refers to changes in the ______.
Germ cells present in the seminiferous tubules undergo ______
In spermatogenesis, at the end of the first meiotic division ______ are formed.
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'.
Match List - I with List - IІ.
| List - I | List - II |
| A. Head | I. Enzymes |
| B. Middle piece | II. Sperm motility |
| C. Acrosome | ΙII. Energy |
| D. Tail | IV. Genetic material |
Choose the correct answer from the options given below:
