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Cretinism and Myxoedema are due to

1. Hypersecretion of thyroxin
2. Hypersecretion of growth hormone
3. Hyposecretion of thyroxin
4. Hyposecretion of growth hormone

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Which of the following is not a natural reflex action?

1. Knee-jerk
2. Blinking of eyes due to strong light
3. Salivation at the sight of food
4. Sneezing when any irritant enters the nose

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The antibiotic penicillin is obtained from

1. Protozoan
2. Bacteria
3. Virus
4. Fungus

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The site of maturation of human sperms is the

1. Seminiferous tubule
2. Interstitial cells
3. Epididymis
4. Prostate gland