Thursday 31 December 2020

Class 9 - Biology - Why Do We Fall ill? (Worksheet-2)(#class9Biology)(#eduvictors)(#cbse2020)

 Class 9 - Biology - Why Do We Fall ill? (Worksheet-2)

Fill in the blanks with suitable words.

1. ________ is a state of complete physical, mental and social well-being and not merely an absence of disease or infirmity.

2. A ________ is any physical or functional change from the normal state that causes discomfort, disability or impairs the health of a person.

3. Diseases may be classified as infectious and non-infectious depending upon their causes, or as _______ and _______ depending upon their duration.

4. Diseases which spread from an infected person to a healthy person are known as _________ diseases.

5. Diseases which do not spread from an infected person to a healthy person are known as ________ diseases.

6. Diseases which last for a very short periods of time are called __________ diseases.

7. Diseases that last for a long time, even as much as lifetime, are called _______ diseases.

8. ________ is the process of developing immunity or resistance against a particular pathogen.

9. A _________ is a biological preparation of dead or weakened microbe that improves immunity to a particular disease.

10. Any inappropriate behaviour of an organ or any external sign of problems in the body is called ___________.

11. The diseases that are caused due to malfunctioning of important body organs are called ___________ diseases.

12. Diseases which are present since birth are called _____________ diseases while the diseases which develop after birth are called ________ diseases.

13. The body's ability to fight off foreign substances by producing antibodies is called __________.

14. The term vaccination was coined by ______________.

15. Prevention of disease is better than _______.


1: Health

2: disease

3: acute, chronic

4: infectious

5: non-infectious

6: acute

7: chronic

8: Immunization

9: vaccine

10: symptom.

11. degenrative

12. congenital, acquired

13. immunity

14. Edward Jenner.

15. cure

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