Which of the following does NOT represent a case of microbial symbiosis?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Biology Mcqsbiology-mcqs
Published
1 Jun 2020
Last updated
28 May 2026

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Explanation

Symbiosis involves a close and long-term biological interaction between two different organisms. Bacteria in the human colon, tapeworms in cows, and protozoans in termites all represent symbiotic relationships. However, bacteria passing through the placenta do not establish a symbiotic association but rather represent transient presence or transmission, thus not qualifying as microbial symbiosis.

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