Science exemplar problems class 9 Solutions for Chapter 13 why do we fall ill

Which one of the following is not a viral disease?

(a) Dengue

(b) AIDS

(c) Typhoid

(d) Influenza

Which one of the following is not a bacterial disease?

(a) Cholera

(b) Tuberculosis

(c) Anthrax

(d) Influenza

Which one of the following disease is not transmitted by a mosquito?

(a) Brain fever

(b) Malaria

(c) Typhoid

(d) Dengue

Which one of the following diseases is not caused by bacteria?

(a) Typhoid

(b) Anthrax

(c) Tuberculosis

(d) Malaria

Which one of the following diseases is caused by protozoans?

(a) Malaria

(b) Influenza

(c) AIDS

(d) Cholera

Which one of the following has a long term effect on the health of an individual?

(a) Common cold

(b) Chickenpox

(c) Chewing tobacco

(d) Stress

Which of the following can make you ill if you come in contact with an infected person?

(a) High blood pressure

(b) Genetic abnormalities

(c) Sneezing

(d) Blood cancer

AIDS cannot be transmitted by

(a) sexual contact

(b) hugs

(c) breastfeeding

(d) blood transfusion

Making anti-viral drugs is more difficult than making anti-bacterial medicines because

(a) viruses make use of host machinery

(b) viruses are on the borderline of living and non-living

(c) viruses have very few biochemical mechanisms of their own

(d) viruses have a protein coat

Which one of the following causes kala-azar?

(a) Ascaris

(b) Trypanosoma

(c) Leishmania

(d) Bacteria

If you live in an overcrowded and poorly ventilated house, it is possible that you may suffer from which of the following diseases

(a) Cancer

(b) AIDS

(c) Airborne diseases

(d) Cholera

Which disease is not transmitted by mosquitoes?

(a) Dengue

(b) Malaria

(c) Brain fever or encephalitis

(d) Pneumonia

Which one of the following is not important for individual health?

(a) Living in clean space

(b) Good economic condition

(c) Social equality and harmony

(d) Living in a large and well furnished house

Choose the wrong statement

(a) High blood pressure is caused by excessive weight and lack of exercise.

(b) Cancers can be caused by genetic abnormalities

(c) Peptic ulcers are caused by eating acidic food

(d) Acne is not caused by staphylococci

We should not allow mosquitoes to breed in our surroundings because they

(a) multiply very fast and cause pollution

(b) are vectors for many diseases

(c) bite and cause skin diseases

(d) are not important insects

You are aware of the Polio Eradication Programme in your city. Children are vaccinated because

(a) vaccination kills polio causing microorganisms

(b) prevents the entry of polio causing organism

(c) it creates immunity in the body

(d) all the above

Viruses, which cause hepatitis, are transmitted through

(a) air

(b) water

(c) food

(d) personal contact

Vectors can be defined as

(a) animals carry the infecting agents from sick person to another healthy person

(b) microorganisms which cause many diseases

(c) infected person

(d) diseased plants

Give two examples for each of the following

(a) Acute diseases

(b) Chronic diseases

(c) Infectious diseases

(d) Non-infectious diseases

Name two diseases caused by Protozoans What are their causal organisms?

Which bacterium causes peptic ulcers? Who discovered the above pathogen for the first time?

What is an antibiotic? Give two examples

Fill in the blanks (a) Pneumonia is an example of ________ disease. (b) Many skin diseases are caused by____ . (c) Antibiotics commonly block biochemical pathways important for the growth of____. (d) Living organisms carrying the infecting agents from one person to another are called____ .

Name the target organs for the following diseases

(a) Hepatitis targets___.

(b) Fits or unconsciousness targets__.

(c) Pneumonia targets____.

(d) Fungal disease targets____.

Who discovered the ‘vaccine’ for the first time? Name two diseases which can be prevented by using vaccines.

Fill in the blanks

(a) ________disease continues for many days and causes________ on the body.

(b)____ disease continues for a few days and causes no longer term effect on body.

(c)____ is defined as physical, mental and social well-being and comfort.

(d) The common cold is____ disease.

(e) Many skin diseases are caused by____ .

Classify the following diseases as infectious or non-infectious.

(a) AIDS

(b) Tuberculosis

(c) Cholera

(d) High blood pressure

(e) Heart disease

(f) Pneumonia

(g) Cancer

Name any two groups of micro-organisms from which antibiotics could be extracted.

Name any three diseases transmitted through vectors.

Explain giving reasons

(a) A balanced diet is necessary for maintaining a healthy body.

(b) The health of an organism depends upon the surrounding environmental conditions.

(c) Our surrounding area should be free of stagnant water.

(d) Social harmony and good economic conditions are necessary for good health

What is a disease? How many types of diseases have you studied? Give examples.

What do you mean by disease symptoms? Explain giving two examples?

Why is the immune system essential for our health?

What precautions will you take to justify “prevention is better than cure”.

Why do some children fall ill more frequently than others living in the same locality?

Why are antibiotics not effective for viral disease?

Becoming exposed to or infected with an infectious microbe does not necessarily mean developing a noticeable disease. Explain.

Give any four factors necessary for a healthy person.

Why is AIDS considered to be a ‘Syndrome’ and not a disease?