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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
Describe, in brief, the changes the uterus undergoes
(i) to receive the zygote.
(ii) if zygote is not formed
Describe placenta structure.
What are the functions of testes in the human male reproductive system?
Give appropriate biological/technical terms for the following:
The kind of twins formed from two fertilized eggs.
Give scientific reasons: Mature erythrocytes in humans lack nucleus and mitochondria
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 are the male gonads in human beings?
In human females, an event that indicates the onset of reproductive phase is :
(a) growth of body
(b) change in hair pattern
(c) change in voice
(d) menstruation
The diagram below represents two reproductive cells A and B. Study the same and then answer the questions that follow:
 |
- Identify the reproductive cells A and B.
- Name the specific part of the reproductive system where the above cells are produced.
- Where in the female reproductive system do these cells unite?
- Name the main hormones secreted by the (1) ovary (2) testes.
- Name an accessory gland found in the male reproductive system and state the function of its secretion.
Describe in brief the role of testis in human male reproductive system.
Define the term puberty.
Choose the correct answer:
Binary fission is a method of __________
Give the function of the following:
Uterus
Rewrite the following terms in a correct and logical sequence:
The luteal phase, follicular phase, menstrual phase, ovulatory phase.
Choose the Odd One Out:
Choose the Odd One Out:
The membranous cover of the ovum at ovulation is ______.
Cryptorchidism is a condition where ______.
The living organisms can be unexceptionally distinguished from the non-living things on the basis of their ability for ______.
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.
