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प्रश्न
Explain the process of fertilization.
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उत्तर
Process of fertilization in humans:
- Formation of zygote by union of sperm and ovum is called as fertilization.
- Fertilization is internal in humans. Semen is ejaculated in vagina during copulation.
- Sperms, in the numbers of few millions, start their journey by the route of vagina – uterus – oviduct.
- One of those few million sperms fertilizes the only ovum present in the oviduct.
Process of fertilization in plants:
- Stigma becomes sticky during pollination.
- The pollen grain germinates over the stigma and gives rise to pollen tube.
- Pollen tube carries two male gametes which are released near egg cell present in the embryo sac.
- One male gamete fuses with a female gamete giving rise to zygote. The second male gamete fuses with two polar nuclei giving rise to endosperm. This is called as double fertilization.
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संबंधित प्रश्न
Give the significance of fertilization.
Name the following:
The fully developed part of the ovary containing a mature egg.
Suppose a normal woman has never borne a child; How many mature eggs would she have produced in her lifetime? Your calculation should be based on two clues-
(a) Eggs are produced at the rate of 1 egg every 28 days (one menstrual cycle)
(b) A woman’s total reproductive period is 13 – 45 years.
Rewrite the terms in the correct order so as to be in a logical sequence.
coitus, ovum, Sperm, sperm duct, urethra, Vagina.
Given below is a portion of the diagram to show the diagrammatic highly magnified view of a single human sperm. Complete the diagram to show its normal structure.
The figure given alongside represents the female reproductive system of a mammal.
Name the parts labelled A - D
Choose the correct answer:
Virgin birth is called ______________
Give the functions of the following:
Fallopian tube
The following diagram represents the vertical sectional view of the human female reproductive system.
What happens to the uterus, if fertilization fails to take place?
What are the functions of testes?
Name two essential structures which take part in fertilization.
Give Reasons
A large number of sperms are required for fertilizing one egg.
Study the diagram given below and then answer the questions that follow:
(i) Name the part labeled A. Name any two hormones produced by the part labeled A.
(ii) What happens to the part labeled B.
(1) if fertilization takes place?
(2) If fertilization does not take place?
(iii) Where does fertilization occur?
(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts.
(1) Acrosome
(2) Mitochondria
Give Technical Term:
What term is used for the production and maturation of sperms in the testes?
Give Technical Term:
A method of contraception in which the sperm duct is cut and ligated.
Write the functional activity of the following structure:
Seminal vesicles
Which parts are converted into Seed and fruit respectively after fertilization?
Which of the following occurs due to the process of capacitation?
State whether True or False:
The chromosome number in germ cells producing the gametes are diploid.
