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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
How is 'oogenesis' markedly different from 'spermatogenesis' with respect to the growth till puberty in the humans?
Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions:
- Acrosome
- Nucleus
- Middle piece
Name the hormones involved in regulation of spermatogenesis.
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) - 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.
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.
At what stage of development are the gametes formed in newborn male and female?
Draw a labeled sketch of a spermatozoan.
Expand the acronym.
LH
The secondary oocyte enter into the fallopian tube through the ______.
Identify the proper order of spermatogenesis and choose the correct option.
First meiotic division is observed in ____________.
Middle piece of mammalian sperm possesses ______.
Identify the wrong statement from the following.
Which one is released from the ovary?
The region of the root tip whose cells undergo rapid elongation and enlargement and are responsible for the growth of the root in length is called the:
Follicular atresia is:
The spermatogonia undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.
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?
How many spermatozoa are formed from one secondary spermatocyte?
Draw a neat and labelled diagram of spermatogenesis.
Meiotic division of the secondary oocyte completed ______.
What is spermatogenesis?
Draw a labelled diagram of a section through the ovary.
Select a correct pair of cells with identical set of chromosomes.
