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प्रश्न
Explain the process of development in human beings.
उत्तर
Development:
- Fertilisation results in the formation of zygote.
- The zygote divides and redivides to form a ball of cells called blastocyst.
- The blastocyst gets implanted on the wall of the uterus and forms the embryo.
- The embryo obtains all the nourishment and oxygen from the mother’s blood.
- A structure called placenta present in the uterus supplies all the necessary nutrients to the embryo through the umbilical cord.
- The development of the foetus takes place for nine months
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संबंधित प्रश्न
What is placenta?
Name the respective part of human female reproductive system:-
(i) that produces eggs,
(ii) where fusion of eggs and sperm takes place, and
(iii) where zygote gets implanted.
Describe in brief what happens to the zygote after it gets implanted.
If a woman is using a copper-T, will it help in protecting her from sexually transmitted diseases?
State the changes that take place in the uterus when Implantation of embryo has occurred
Give scientific reasons: When an ovum gets fertilized, menstrual cycle stops temporarily in a woman.
Give scientific reasons: Mature erythrocytes in humans lack nucleus and mitochondria
Given below are diagrams showing the different stages in the process of fertilisation of an egg. in the human female reproductive tract.
Study the diagrams and answer the questions:
1) Arrange the letters given below each diagram in a logical sequence to show the correct order in the process of fertilisation.
2) Where does fertilisation normally take place? and What is ‘Implantation’ that follows fertilisation?
3) Mention the chromosome number of the egg and zygote in humans.
4) Explain the term ‘Gestation’. How long does Gestation last in humans?
5) Draw a neat, labelled diagram of a mature human sperm.
Where does a fertilised ovum develop into a baby in the human body?
What is the frequency of menstrual cycle in human females (or women)?
What are the male and female gonads in human beings? Mention their functions.
What is puberty? Who attains puberty at an earlier age in human beings : male or female (boy or girl)?
How long does a human baby take to develop before birth?
What is placenta? What is its function?
What joins embryo to placenta in mother's body?
One of the following is not a part of the human male reproductive system. This is
(a) testis
(b) oviduct
(c) seminal vesicle
(d) prostrate gland
Write two examples of sexually transmitted diseases caused by virus.
Write two examples of sexually transmitted diseases caused by bacteri.
Fill in the blank.
In humans, sperm production occurs in the organ ----------------.
Fill in the blank.
In humans, ------ chromosome is responsible for maleness.
“Gender of child is determined by the male partner of couple”. Draw a diagram explaining the above statement.
State whether the following statement is true or false:
Oviducts and fallopian tubes are one and the same thing.
Choose the correct answer:
Binary fission is a method of __________
Define the following:
Clone
Define the following:
Implantation
Answer the following question:
Why are family planning measures needed in our country?
Differentiate
Sexual Reproduction and Asexual Reproduction.
State the Location:
Uterus
Choose the Odd One Out:
Choose the Odd One Out:
Choose the Odd One Out:
Choose the Odd One Out:
Mention the importance of the position of the testes in humans.
What is the composition of semen?
The membranous cover of the ovum at ovulation is ______.
Cryptorchidism is a condition where ______.
Arrange and rewrite the terms in the group in the correct order to be in a logical sequence beginning with the term that is underlined:
Testis, Urethra, Sperm duct, epididymis.
Given below is a group of terms. In the group, one pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.
Female gonad : Ovaries :: Male gonad : ______.
