Many of the bacteria living in the human large intestine feeding on undigested food without harming the host are

Predators

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Commensals

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Symbionts

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Parasites

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Solution

The correct option is B Commensals
When bacteria feed on undigested food, they neither harm nor benefit the organism. Apart from this, the bacteria get nutrition from this undigested food and thus they are benefited. So, the bacteria are said to be commensals as they depict the population interaction 'commensalism'.
So, option B is the correct answer.

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Question 3 (b)
Tick (√) mark the correct answer in each of the following:
(b) Water from the undigested food is absorbed mainly in the
(i) stomach (ii) food pipe (iii) small intestine (iv) large intestine

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