Class 8

Microorganisms: Friend and Foe question bank (Science)

Practice 73 free Class 8 Science - Microorganisms: Friend and Foe questions with answers and step-by-step solutions.

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Q1.

Pasteurization of milk involves heating milk to about $70^{\circ}\text{C}$ for $15$ to $30$ seconds and then:

(A)

Slowly cooling it at room temperature

(B)

Suddenly chilling and storing it

(C)

Adding salt preservatives

(D)

Boiling it again at $100^{\circ}\text{C}$

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Q2.

Alexander Fleming discovered the first antibiotic from a mould fungus in 1929. Name this historic antibiotic:

(A)

Streptomycin

(B)

Penicillin

(C)

Tetracycline

(D)

Amoxicillin

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