Explain acute and chronic diseases.

Write any three differences between acute and chronic diseases.

Define chronic diseases.

Write example of chronic disease.

Define disease.

What is meant by STDs? Explain four such diseases.

Explain how a hereditary disease can be corrected. Give an example of first successful attempt made towards correction of such diseases.

How can crop varieties be made disease resistant to overcome food crisis in India? Explain. Name one disease resistant variety in India of: Wheat to leaf and stripe rust.