Match the names of the disease with the modes of transmission. a) Dengue i) Air b) Diptheria ii) Sexual contact c) Tetanus iii) Droplets in the air d) Food poisoning iv) Aedes mosquito e) Chickenpox v) Indirect contact f) Amoebic dysentery vi) Contaminated food g) AIDS vii) Female Anopheles mosquito h) Malaria viii) Water i) Common cold ix) Open wound

a - iv Dengue is spread by a mosquito of the female Aedes aegypti . The symptoms include high fever, headache, muscle and joint pains, skin rash, bleeding, low levels of blood platelets, etc. b - iii Diphtheria is transmitted through droplets that are present in the air. They carry bacteria that cause the disease. c - ix Tetanus is transmitted through bacterium Clostridium tetani. The symptoms are high blood pressure, fever, excessive sweating, etc. d - vi Food poisoning is caused due to consuming food contaminated. To prevent this disease, food should be preserved by inhibiting the growth of microorganisms. e - v Chickenpox is an infection caused by the varicella-zoster virus. It also spreads through indirect contact. The symptoms are scabs, fever, nausea, etc. f - viii Amoebic dysentery is caused due to contaminated food and water. These organisms live in the large intestine and produce eggs or cysts, which are passed out of the body with the stool. g - ii AIDS is caused by the human immunodeficiency virus (HIV). They are spread through sexual contact, infected blood, needles and syringes. It affects the immunity or resistance power of our body. h - vii The causative agent of malaria is protozoa. The female Anopheles mosquito act as a vector or carrier for protozoa. i - i The common cold is caused by a virus. It is transmitted by the air contaminated with microorganisms. The immune system sends out white blood cells to attack this microbe. a) Dengue iv) Aedes mosquito b) Diphtheria iii) Droplets in the air c) Tetanus ix) Open wound d) Food poisoning vi) Contaminated food e) Chickenpox v) Indirect contact f) Amoebic dysentery viii) Water g) AIDS ii) Sexual contact h) Malaria vii) female Anopheles mosquito i) Common cold i) Air

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Galaxy A Course in Science Book 8>Chapter 2 - Microorganisms—Friends and Foes>Put on your thinking cap>Q 2

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Important Questions on Microorganisms—Friends and Foes

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Galaxy A Course in Science Book 8>Chapter 2 - Microorganisms—Friends and Foes>Put on your thinking cap>Q 2

These are produced in response to vaccines.

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Galaxy A Course in Science Book 8>Chapter 2 - Microorganisms—Friends and Foes>Put on your thinking cap>Q 2

Tetracycline and erythromycin are the antibiotics obtained from

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Galaxy A Course in Science Book 8>Chapter 2 - Microorganisms—Friends and Foes>Put on your thinking cap>Q 2

This method is most commonly used for preserving milk.

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Galaxy A Course in Science Book 8>Chapter 2 - Microorganisms—Friends and Foes>Put on your thinking cap>Q 3

Match the names of the disease with the modes of transmission.

a) Dengue	i) Air
b) Diptheria	ii) Sexual contact
c) Tetanus	iii) Droplets in the air
d) Food poisoning	iv) Aedes mosquito
e) Chickenpox	v) Indirect contact
f) Amoebic dysentery	vi) Contaminated food
g) AIDS	vii) Female Anopheles mosquito
h) Malaria	viii) Water
i) Common cold	ix) Open wound