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प्रश्न
Give any four significances of fertilization in humans.
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उत्तर
- The secondary oocyte completes the process of oogenesis and is transformed into a mature ovum (n).
- The diploid chromosome number is restored in the zygote by the process of syngamy.
- The ovum lacks the centrioles necessary for further divisions, which are received from the sperm during fertilization.
- Fertilization involves the fusion of male and female gametes from the two parents. It results in variations that are significant to evolution.
- The sex of the offspring is determined.
Notes
Students should refer to the answer according to their question.
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संबंधित प्रश्न
Define the term Gamete.
Name the following:
The accessory gland in human males whose secretion activates the sperms
Rewrite the terms in the correct order so as to be in a logical sequence.
coitus, ovum, Sperm, sperm duct, urethra, Vagina.
State whether the following statement is true or false:
Gestation in humans is completed in about 380 days.
Name the following:
Organ where fertilization occurs.
Name the following:
Fusion of sperm and ovum.
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
What term is given to the period of development of the foetus in the womb?
Give Reasons
Gametes have a haploid (n) number of chromosomes.
Give Reasons
The oviduct funnel is lined with cilia.
Give a labeled structure of ovum.
Name the Following
The basic unit of the testes.
Give Technical Term:
Rupture of the follicle and release of the ovum from the ovary.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Sperm is a highly motile male gamete.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The process of fusion of the sperm nucleus and the egg nucleus is termed implantation.
The enzyme involved in penetration of sperm into ovum is ______.
In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is
The eggs of frogs do not have shells for protection, yet they are safe in water, how?
State whether the following statement is True or False. If false, correct the statement:
The eggs of fish are covered by hard shells for protection.
What are the potential drawbacks in adoption of the IVF method?
- High fatality risk to mother.
- Expensive instruments and reagents.
- Husband/wife necessary for being donors.
- Less adoption of orphans.
- Not available in India.
- Possibility that the early embryo does not survive.
Choose the correct answer from the options given below:
