P S Verma and V K Agarwal solutions for Biology [English] Class 9 chapter 5 - Why Do We Fall Ill [Latest edition]

Differentiate between healthy and disease free.

Name the health problems subsequent to a disaster.

What provisions are made by local authorities to provide clean drinking water?

What provisions are made by local authorities for solid waste management?

Distinguish between symptoms and signs of a disease.

Write down the causal organisms of the following diseases :

Tuberculosis, Kala-azar, Malaria, Measles, Athlete's foot, Cholera.

Mention two means of physical contacts by which AIDS does not spread.

Differentiate between carrier and vector.

Write short note on organ-specific and tissue-specific manifestations of disease.

Explain how does the body react after the entry of microbe in the body.

Why a person suffering from AIDS cannot fight even very small infections?

"We can treat an infectious disease by killing microbe". Justify the statement with suitable examples.

"Prevention is better than cure". Explain.

Explain how does vaccine work?

Name any three diseases of human beings caused by bacteria and three diseases caused by virus.

How does dehydration set in during diarrhoea?

In a cluster of hutments, many people are suffering from malaria. Mention the unhygienic conditions that must be prevailing in that locality. How does a doctor confirm malaria?

Explain the methods of prevention of malaria.

It was diagnosed that the body of a patient has lost its power of fighting any infection. Name the disease he is suffering from. What type of microbe is responsible for this disease and how does it spread from one person to the other.

Define diarrhoea.

Give an account of occurrence, symptoms, prevention and control of Diarrhoea.

Why is rabies is called hydrophobia? Explain.

Write short note on Pulse Polio Programme.

Describe community issues that influence health.

Explain various modes of transmission of infectious diseases.

Explain the general ways of preventing infection.

Write short note on principle of treatment.

Write short notes on

(a) AIDS;

(b) Malaria.

Describe certain bacterial diseases of human beings.

Give an account of some important viral diseases of human beings.

Write short notes on

(a) Tuberculosis;

(b) Polio.