Advertisements
Advertisements
प्रश्न
How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?
Advertisements
उत्तर
Each ovary produces several immature eggs, which are connected with groups of other cells known as follicles. In humans, only one egg is usually removed at a time; however, two or more may emerge during the menstrual cycle. The egg emerges from the ovary between the 14th and 16th days of the typically 28-day menstrual cycle. Fertilisation of a single egg results in one zygote (monozygotic) that divides into two embryos, forming identical twins. If the twins were born fraternal, two eggs would be released. Fraternal twins (also known as non-identical twins) are typically formed when two fertilised eggs are implanted in the uterine wall at the same time. The two eggs produce two zygotes; hence, these twins are also known as dizygotic or binovular twins.
APPEARS IN
संबंधित प्रश्न
Draw a labelled diagram of the female reproductive system.
Name the function of the following:
Endometrium
Describe the development of a fertilized ovum upto implantation.
Given here is a section of the female reproductive system of human beings.
Name the parts labelled 1 to 4
Fill in the blank:
Lower part of uterus is called _________.
Choose the odd one in each of the following:
Ovary; fallopian tube; ureter; uterus
Rewrite the terms in the correct order so as to be in a logical sequence.
Puberty, menopause, menstruals, menarche, reproductive age.
Differentiate between:
Prostate gland and cowper’s gland (the nature of secretion)
Sketch the labeled diagram:
Human female reproductive system
Choose the correct answer:
The onset of menstruation in the female is termed __________
The diagram alongside is the vertical section of female reproductive organs. Study the diagram and answer the questions that follow:
(i) Name the fully developed part of ovary containing the ovum.
(ii) Name the organ of the female body in which the foetus develops.
(iii) What is ovulation?
(iv) Which two hormones are secreted by ovary?
Name the following:
The part of the female reproductive system in which fertilization occurs.
Name the following:
Organ producing ovum.
Complete the following statement by choosing the correct alternative:
Menstrual flow is a character is the feature of ______.
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?
The adjoining figure represents the female reproductive organ of the humans
(i) How does the human embryo developing in the uterus obtain its nourishment?
(ii) Which structure protects and nourishes the developing embryo?
(iii) Define ovulation.
Name the Following
The structure formed after the release of ovum from the Graffian follicle.
Complete the following sentences with appropriate word:
The female equivalent of the penis is the _______.
The largest cell in the human body of a female is ______.
Womb is used to refer ______.
Development of mammary glands is controlled by ____________.
Identify the layer of the uterine wall that undergoes changes during menstrual cycle.
Egg is liberated from ovary in ______.
The estrus cycle is a characteristic of ______.
What marks the beginning of the reproductive life of a woman?
Which among the following is not the function of testes at puberty?
- formation of germ cells
- secretion of testosterone
- development of placenta
- secretion of estrogen
How can we say that fish exhibits external fertilisation?
Anterior lobe of pituitary secretes:
______ acts as a birth canal.
Progesterone is secreted by ______.
