Human Body and Health MCQs – Page 2

Solved Everyday Science MCQs on the human body: organs, bones, blood, hormones, vitamins, deficiency diseases and common infections, with explanations.

1. 21

   How many permanent teeth does an adult human normally have?

   A28B30C32D36

   Correct answer: C. 32

   Adults have 32 permanent teeth, including the four wisdom teeth. Children have 20 milk teeth.

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2. 22

   The functional unit of the kidney that filters blood is the:

   ANephronBNeuronCVillusDAlveolus

   Correct answer: A. Nephron

   Each kidney has about a million nephrons, which filter waste from the blood to form urine. Alveoli are air sacs in the lungs.

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3. 23

   A normal human body cell contains how many chromosomes?

   A23B44C46D48

   Correct answer: C. 46

   Body cells have 46 chromosomes in 23 pairs. Egg and sperm cells carry 23.

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4. 24

   Gas exchange in the lungs takes place in tiny air sacs called:

   ABronchiBTracheaCAlveoliDVilli

   Correct answer: C. Alveoli

   Oxygen passes from the alveoli into the blood, and carbon dioxide passes out of the blood into the alveoli to be breathed out.

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5. 25

   Which part of the eye controls the amount of light entering it?

   ACorneaBIrisCLensDRetina

   Correct answer: B. Iris

   The iris, the coloured part of the eye, widens or narrows the pupil to control how much light enters.

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