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प्रश्न
Explain the process of development in human beings.
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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
Find the odd one out and write it: vagina, uterus, vas deferens, ovary
Describe the function of placenta.
What could be the reasons for adopting contraceptive methods?
Give appropriate biological/technical terms for the following:
The kind of twins formed from two fertilized eggs.
Match the Column:
| no | Column A | Column B |
| 1 | Allele | Control of automobile exhaust |
| 2 | Leydig cells | Tourniquet |
| 3 | Utriculus | Alternate forms of genes |
| 4 | Snake bite | Dynamic equilibrium |
| 5 | Euro IV norms | Testosterone |
| Sudden change in genes | ||
| Static equilibrium |
What is the scientific name of birth canal?
What is the life support system of a fetus?
Name the organs which produce ova (or egg cells) in human females.
What is meant by implantation?
In human males, the testes lie in the scrotum outside the body because it helps in the ______.
Which among the following are not the functions of testes at puberty?
(i) formation of germ cells
(ii) secretion of testosterone
(iii) development of the placenta
(iv) secretion of estrogen
The male gametes in a flower and in a human are produced respectively in :
(a) stigma and ovary
(b) anther and style
(c) ovary and testes
(d) anther and testes
Explain why, a human zygote is more likely to grow into an adult than a frog zygote.
Describe in brief the role of prostate gland in human male reproductive system.
Diagram shows the reproductive system of female human beings:
(i) Name the parts numbered 1 to 14.
(ii) Normally, after how many days does an ovary release an egg?
(iii) Where are the sperms released during coitus?
(iv) What is the role of sperms after their ejaculation in vagina?
(v) What is the function of the organ numbered 5?
(vi) What is the gestation period in human?
Define the following:
Parthenogenesis
State the location:
Prostate gland
Reproductive organs are also considered endocrine glands.
Which of the following correctly pairs a reproductive function with its description?
