Solution of Chapter 13. Why Do We Fall Ill (NCERT Science Exemplar Book)

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 disease is not transmitted by mosquito?

Which one of the following disease is 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 antiviral 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

(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) Pneumoniae targets ______.

(d) Fungal disease targets ______.

Who discovered ‘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 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) Common cold is _______ disease.

(e) Many skin diseases are caused by_______.

Classify the following diseases as infectious or noninfectious.

Name any two groups of microorganisms from which antibiotics could be extracted.

Name any three diseases transmitted through vectors.

Explain giving reasons

(a) Balanced diet is necessary for maintaining healthy body.

(b) 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 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 noticeable disease. Explain.

Give any four factors necessary for a healthy person.

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