NCERT Exemplar solutions for Science [English] Class 9 chapter 13 - Why Do We Fall Ill [Latest edition]

Which one of the following is not a viral disease?

Which one of the following is not a bacterial disease?

Which one of the following diseases is not transmitted by mosquitoes?

Which one of the following diseases are caused by bacteria?

Which one of the following diseases is caused by protozoans?

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

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

AIDS cannot be transmitted by

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

Which one of the following causes kala-azar?

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

Which disease is not transmitted by mosquitoes?

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

Choose the wrong statement

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

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

Viruses, which cause hepatitis, are transmitted through

Vectors can be defined as

Give two examples for each of the following

Acute diseases

Give two examples for each of the following

Chronic diseases

Give two examples for each of the following

Infectious diseases

Give two examples for each of the following

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

Pneumonia is an example of ______ disease.

Many skin diseases are caused by ______.

Antibiotics commonly block biochemical pathways important for the growth of ______.

Living organisms carrying the infecting agents from one person to another are called ______.

Name the target organs for the following diseases

Hepatitis targets ______.

Name the target organs for the following diseases

Fits or unconsciousness targets ______.

Name the target organs for the following diseases

Pneumonia targets ______.

Name the target organs for the following diseases

Fungal disease targets ______.

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

______ disease continues for many days and causes ______ on body.

______ disease continues for a few days and causes no longer-term effect on the body.

______ is defined as physical, mental and social well-being and comfort.

Common cold is ______ disease.

Many skin diseases are caused by ______.

Classify the following diseases as infectious or non-infectious.

1. AIDS
2. Tuberculosis
3. Cholera
4. High blood pressure
5. Heart disease
6. Pneumonia
7. 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 balanced diet is necessary for maintaining a healthy body.

Explain giving reasons

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

Explain giving reasons

Our surrounding area should be free of stagnant water.

Explain giving reasons

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?