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प्रश्न
Give Reasons
At the time of birth, the testes descend into the scrotal sacs.
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उत्तर
In human beings (mammals) the temperature required for the production and survival of sperms is lower than that of the body temperature. Hence, to provide a suitable temperature of about 2 – 3°C lower than that of body temperature, the testes descend into the scrotal sec at the time of birth.
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संबंधित प्रश्न
Name the parts of the human female reproductive system where
i. fertilisation takes place
ii. implantation of the fertilised egg occurs
What are the different methods of contraception?
Write the function of the following part in a human female reproductive system:
Fallopian tube
The diagram given below is that of a developing human foetus. Study the diagram and then answer the questions that follow:
(i) Label the parts numbered 1 to 3 in the diagram.
(ii) Mention any two functions of the part labelled 2 in the diagram.
(iii) Explain the significance of the part numbered 3 in the diagram.
(iv) Define the term ‘Gestation’. What is the normal gestational period of the developing human embryo?
(v) Mention the sex chromosomes in a male and female embryo.
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 |
Explain why, a human zygote is more likely to grow into an adult than a frog zygote.
Draw a sectional view of human female reproductive system and label the following parts :
(i) Where the development of egg occurs.
(ii) Where fertilization takes place.
Describe in brief the role of prostate gland in human male reproductive system.
Describe the role of the following in human beings:
(i) Seminal vesicles
(ii) Prostate gland
Choose the Odd One Out:
