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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.
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true (T) or false (F):
The plumule of an embryo gives rise to the root system.
Differentiate between the following pair:
Efferent duct and sperm duct
Choose the odd one in each of the following:
Sperm; implantation; fertilization; ovum; afterbirth
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.
Complete the following statement by choosing the correct alternative:
Fertilization occurs in ______.
The following diagram represents the vertical sectional view of the human female reproductive system.
How does the uterus prepare for the reception of zygote?
Give Reasons
Gametes have a haploid (n) number of chromosomes.
Give Reasons
The urethra is also called urinogenital duct.
Give a labeled structure of ovum.
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:
The process of fusion of the sperm nucleus and the egg nucleus is termed implantation.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Fertilization is the product of the egg nucleus and the sperm nucleus.
Write the functional activity of the following structure:
Seminal vesicles
Multiple Choice Question:
Ovulation in mammals is a process in which
How can plants and animals save themselves from extinction?
The enzyme involved in penetration of sperm into ovum is ______.
Which of the following occurs due to the process of capacitation?
Which of the following is the first cell of human life?
State whether the following statement is True or False. If false, correct the statement:
Human egg has a head, middle piece and tail.
Which hormones are called neurohypophyseal hormones?
