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प्रश्न
Why does menstruation occur?
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उत्तर
Menstruation is a process in which blood and mucous flow out every month through the vagina. This process occurs every month because one egg is released from the ovary every month and at the same time, the uterus (womb) prepares itself to receive the fertilised egg. Thus, the inner lining of the uterus gets thickened and is supplied with blood to nourish the embryo. If the egg does not get fertilised, then the lining of the uterus breaks down slowly and gets released in the form of blood and mucous from the vagina. It lasts for three to five days.
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संबंधित प्रश्न
Draw a diagrammatic sectional view of the female reproductive system of human and label the parts
(i) where the secondary oocytes develop
(ii) which helps in collection of ovum after ovulation
(iii) where fertilization occurs
(iv) where implantation of embryo occurs.
How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?
What is hymne?
Explain with examples types of asexual reproduction in unicellular organisms.
After puberty human female shows cyclic changes in her reproductive system. Explain structural and hormonal changes in the uterus.
(OR)
Give reasons :
(1) Scrotal sac serves as thermoregulator.
(2) Corpus luteum gets converted into corpus albicans in absence of fertilization.
(3) Missing of menses is the first indication of pregnancy.
(4) Surgical sterilization is a permanent method of birth control. (5) Human egg is microlecithal.
Choose the correct answer:
Ovum is a ______________
The below diagram represents the vertical view of the human female reproductive system.
(i) Label the parts indicated by the guidelines 1 to 8.
(ii) How does the uterus prepare for the reception of a zygote?
(iii) What happens to the uterus if fertilization takes place?
(iv) What happens to the uterus if fertilization has failed to take place?
Name the Following
The term used when beard and mustache appear, harshening of voice, broadening of shoulders, etc. takes place.
Multiple Choice Question:
Corpus luteum in mammals occurs in
Complete the table.
| Sex/Gender | Reasons of infertility |
| Female | |
| Male |
After fertilization the ovary develops into ______.
Primordial follicle cells undergo mitotic division to produce ______.
Mother gives birth to a baby but the baby has characters of both parents. How is this possible?
How can we say that fish exhibits external fertilisation?
What is the other name for fallopian tubes?
______ receives the sperms and acts as a birth canal during childbirth.
Draw a neat diagram of the female reproductive system and label the parts associated with the following:
(a) production of gamete
(b) site of fertilisation
(c) site of implantation
(d) birth canal
The ______ is also called the womb.
The ______ is also called the womb.
