Classify the following diseases as infectious and non-infectious:

(a) AIDS; (b) Tuberculosis; (c) Cholera; (d) High blood pressure; (and) Heart disease; (f) Pneumonia; (g) Cancer.

Name any three diseases transmitted through vectors.

Fill in the blanks:

(a) ..... disease continues for many days and causes ... on body.

(b) …… disease continues for a few days and causes no long 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

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