World of Microbes

Samacheer Book Back Questions And Answers For Science Standard 9 “World of Microbes“

I. Choose the correct answer:
1. Which of the following is transmitted through air?
(a) Tuberculosis
(b) Meningitis
(c) Typhoid
(d) Cholera

2. One of the means of indirect transmission of a disease is
(a) sneezing
(b) coughing
(c) vectors
(d) droplet infection

3. Diphtheria affects the
(a) lungs
(b) throat
(c) blood
(d) liver

4. The primary organ infected during tuberculosis is
(a) bone marrow
(b) intestine
(c) spleen
(d) lungs

5. Microbes that generally enter the body through nose are likely to affect
(a) gut
(b) lungs
(c) liver
(d) lymph nodes

6. The organ affected by jaundice is
(a) liver
(b) lungs
(c) kidney
(d) brain

7. Poliomyelitis virus enters the body through
(a) skin
(b) mouth and nose
(c) ears
(d) eye

II. Fill in the blanks:
1. _____ break down organic matter and animal waste into ammonia.
2. Typhoid fever is caused by _____.
3. H1N1 virus causes _____.
4. is a vector of viral disease dengue.
5. vaccine gives considerable protection against tuberculosis.
6. Cholera is caused by _____ and malaria is caused by _____.

Answers:
1. Decomposers
2. salmonella typhi
3. swine flu
4. Aedes aegypti mosquito
5. BCG
6. bacteria (vibrio cholera), protozoa (plasmodium)

III. Expand the following:
1. ORS
2. HIV
3. DPT
4. WHO
5. BCG

Answers:
1. Oral Rehydration Solution
2. Human Immunodeficiency Virus
3. Diphtheria Pertussis Tetanus
4. World Health Organisation
5. Bacillus Calmette Guerin

IV. Pick out the odd one:
1. AIDS, Retrovirus, Lymphocytes, BCG
2. Bacterial disease, Rabies, Cholera, Common cold and Influenza.

Answers:
1. BCG
2. Cholera

V. State whether true or false. If false, correct the statement:
1. Rhizobium, associated with root nodules of leguminous plants fixes atmospheric nitrogen.
2. Non-infectious diseases remain confined to the person who develops the disease and do not spread to others.
3. The process of vaccination was developed by Jenner.
4. Hepatitis B is more dangerous than Hepatitis A.

Answers:
1. True
2. True
3. True
4. True

VI. Match the following:
1. Swine flu           A. Human Papilloma virus
2. Genital warts     B. Human Immunodeficiency Virus
3. AIDS                  C. Mycobacterium
4. Tuberculosis      D. Influeuza virus H1N1

Answers:
1. D
2. A
3. B
4. C

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