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प्रश्न
Define the following:
Parthenogenesis
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उत्तर
Parthenogenesis: It is a type of asexual reproduction in which a female gamete or egg cell develops into an individual without fertilization.
संबंधित प्रश्न
Write the functions of the following parts in human female reproductive system:-
(i) Ovary
(ii) Oviduct
(iii) Uterus
What could be the reasons for adopting contraceptive methods?
State the changes that take place in the uterus when Implantation of embryo has occurred
State the changes that take place in the uterus when Female gamete/egg is not fertilised
Mention the total number of chromosomes along with the sex chromosomes that are present in a human female and a human male. Explain how in sexually producing organisms the number of chromosomes in the progeny remains the same as that of the parents.
What are the male sex cells in humans called?
What do the testes in a man produce?
fertilisation in humans can occur only once in a month. Why?
Which structure in human female is equivalent to the penis in the male?and in what respect the structures are equivalent?
When a female child is born, her ovaries already contain thousands of immature eggs (or ova) contained in immature structures A. On maturing, A bursts open and an egg shoots out of the ovary in a process called B. The process B starts in the females at puberty and occurs again and again after a time period x. Before every occurrence of process B, the inner lining of uterus becomes thick and soft with lots of blood vessels in it. When the egg cell gets fertilised by a sperm, then an event C occurs in the life of mature human female which lasts for time period y leading to the birth of baby. If, however, the egg cell released by the ovary does not get a sperm to fuse with, then the thick and soft inner lining of uterus breaks down and comes out of the female's body in an event called D. The occurrence of event D is controlled by chemical substances E.
(a) What are A?
(b) What is process B?
(c) What is the time period x?
(d) Name the event C.
(e) How much is the time period y?
(f) What is the name of process D?
(g) Name the chemical substances E.
Define the term puberty.
Gender of child is determined by the male partner of couple. Explain with reasons whether this statement is true or false.
Draw a diagram to display the vertical view of human female reproductive system and label the following parts in the diagram:
(1) Ureter
(2) Ovary
(3) Funnel of fallopian tube
(4) Urethra.
Give the functions of the following:
Vagina
Testosterone is produced by:
A zygote is formed by the fusion of a male gamete and a female gamete. The number of chromosomes in the zygote of a human is ______.
Humans are classified as which type of reproducing organisms based on their mode of reproduction?
What occurs during the implantation stage of human reproduction?
Testes and ovaries are classified as which category of reproductive organs?
