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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?
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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.
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संबंधित प्रश्न
Describe the development of a fertilized ovum upto implantation.
Which part of the human body produces Ova?
Choose the odd one in each of the following:
Sperm; implantation; fertilization; ovum; ovum; after birth.
What is hymne?
Complete the paragraph with the help of words given in the bracket.
(Luteinizing hormone, endometrium of uterus, follicle stimulating hormone, estrogen, progesterone, corpus luteum)
Growth of follicles present in the ovary occurs under the effect of ______. This follicle secretes estrogen. ______ grows/regenerates under the effect of estrogen. Under the effect of ______, fully grown up follicle bursts, ovulation occurs and ______ is formed from remaining part of follicle. It secrets ______ and ______. Under the effect of these hormones, glands of ______ are activated and it becomes ready for implantation.
Name the two types of twins.
Choose the correct answer:
The onset of menstruation in the female is termed __________
Name the following:
Organ producing ovum.
Complete the following statement by choosing the correct alternative:
Menstrual flow is a character is the feature of ______.
Give Technical Term:
What term is used for the production and maturation of eggs in the ovaries?
Give Technical Term:
What term is used for the arrest of reproductive capacity in females?
Observe the diagram and answer the following questions.
- Label the indicated parts 1, 2 and 3 in the diagram.
- Where the fertilization of ovum occurs?
- Where does the embryo get implanted after fertilization?
Identify the term used for isthmus.
The pair of thin folds present inner to the labia majora is ____________.
Identify the distal narrow part of the duct opening into the uterus.
Which of the following is ectodermal in origin?
| (i) | Heart |
| (ii) | Sweat glands |
| (iii) | Adrenal medulla |
| (iv) | Middle ear |
| (v) | Urinary bladder |
| (vi) | Dermis of skin |
A sac shaped like an upside down pear with a thick lining and muscles in the pelvic area where a fertilized egg or zygote comes to grow into a baby is called ______.
Egg is liberated from ovary in ______.
Which part of ovary in mammals acts as an endocrine gland after ovulation?
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
Which of the following statements is true about the subjects?
When the foetus is growing inside the uterus it needs nutrients. Which part provides these nutrients?
Read the following and answer from given below:
Oogenesis is the process of the formation of an ovum in the ovaries. It consists of three phases: multiplication, growth, and maturation. Oogenesis is controlled by hormones GnRH, LH, FSH. GnRH secreted by the hypothalamus stimulates the anterior lobe of the pituitary gland to secrete LH and FSH.
Identify the functions of LH.
- Release of a secondary oocyte from Graafian follicle.
- Stimulates corpus luteum to secrete progesterone.
- Stimulates estrogen formation.
- Promotes development of egg to form secondary oocyte.
In human beings, the correct sequence of events during reproduction is
Anterior lobe of pituitary secretes:
______ acts as a birth canal.
______ is not a part of the female reproductive system in human beings.
Give reason:
Uterine lining becomes thick and spongy after fertilisation.
The ______ is also called the womb.
Write the specific location of the following:
Vagina
