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What is the limiting value of water activity for the growth of any micro-organism?
Question

What is the limiting value of water activity for the growth of any micro-organism?

A.

Aₓ 0.75

B.

Aₓ 0.88

C.

Aₓ 0.60

D.

Aₓ greater than 0.91

Correct option is D


Most bacteria require water activity (Aₓ) above 0.91 for growth. Fungi can tolerate lower values. Therefore, Aₓ > 0.91 is considered limiting for many microorganisms, especially pathogenic bacteria.

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