Match the pairs.

Give scientific reasons.

A. Foam accumulates on at the surface of ‘dal’ kept for a long time in summer.

B. Why are naphthalene balls kept with clothes to be put away?

Write down the modes of infection and the preventive measures against fungal diseases.

Answer the following questions.

A. Which vaccines are given to infants? Why?

B. How is a vaccine produced?

C. How do antibiotics cure disease?

D. Are the antibiotics given to humans and animals the same? Why?

E. Why is it necessary to safely store the pathogens of a disease against which vaccines are to be produced?

Answer the following questions in brief.

A. What are ‘broad spectrum antibiotics’?

B. What is fermentation?

C. Define ‘Antibiotic’.