Given below is a diagram of the lateral section of a testis of a man.

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asked Jan 12 in Class X Science by priya12 (-10,066 points)

Given below is a diagram of the lateral section of a testis of a man. Study the same and answer the questions that follow:
reproductive-system-icse-solutions-class-10-biology-2

(i) Label the parts numbered I to 4 of the diagram.
(ii) State the functions of the parts labeled 1 and 3.
(iii)What is the significance of the testes being located in the scrotal sac outside the abdomen?
(vi)What is the role played by the inguinal canal?
(v) What is semen?

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answered Jan 12 by navnit40 (-1,351 points)

(i) 1. Seminiferous tubules 2. Testicular lobule 3. Epididymis 4. Vas deferens
(ii) 1. Seminiferous tubules: sperm production, nourishment and protection of sperm.
3. Epididymis: stores sperm, contributes to seminal fluid.
(iii) Scrotal sac acts as thermo regulator. The temperature in scrotal sac remains 2-3°C lower than the body temperature which is suitable for maturation of sperm.
(iv) Through inguinal canal sperm duct is connected and so passes the sperm to urinary bladder.
(v) Semen is a mixture of mature sperm and secretions of’various accessory glands. It is a milky fluid.

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