Aids to Health
ICSE · Class 9 · Biology
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Which of the following is an example of mechanical barrier in local defence system?
Which type of immunity is obtained when a person receives anti-venom injection after snake bite?
BCG vaccine provides protection against which disease?
The first antibiotic discovered was:
Sample Questions
Which of the following are functions of white blood cells in local defence? (Select all correct answers)
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Engulf bacteria by phagocytosis, Squeeze out of blood capillaries by diapedesis, Destroy harmful microorganisms
WBCs fight germs by engulfing them (phagocytosis), can move out of blood vessels (diapedesis), and destroy microorganisms. Mucus is produced by epithelial cells and HCl by stomach cells.
Which of the following are examples of antiseptics? (Select all correct answers)
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Iodine, Lysol, Carbolic acid
Antiseptics are mild chemical substances that kill germs when applied on the body, and examples given include iodine, lysol, carbolic acid, benzoic acid, mercurochrome, and boric acid. Phenol is listed as a disinfectant, not an antiseptic, because disinfectants are stronger substances used on spots and places where germs thrive. So the correct examples here are iodine, lysol, and carbolic acid.
Antibodies are produced by which cells?
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Lymphocytes
Antibodies are produced by specialized lymphocytes (a type of white blood cell) in response to antigens. These cells concentrate in lymph nodes, spleen, and circulating blood and lymph.
Which vaccine contains living weakened germs?
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BCG vaccine
BCG vaccine contains living weakened germs. TAB, Salk's, and rabies vaccines contain killed germs. Living weakened germs provide better immunity without causing disease.
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