Q56 of 104 Page 40

Where do Rhizobium bacteria live? What is their function?

Rhizobium bacterium is found in the soil. It lives in the root nodules of leguminous plants such as beans and peas, with which it has a symbiotic relationship. It is involved in the fixation


of nitrogen in leguminous plants (pulses).

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55

Why should we not let water collect anywhere in the neighbourhood?

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Name one animal disease each caused: (i) by virus (ii) by bacteria (iii) by fungus.

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Name any two

(a) bacteria


(b) viruses


(c) protozoa


(d) algae, and


(e) fungi.

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State the beneficial effects (or usefulness) of micro-organisms in our lives.