Question

5. When similar unicellular organisms occur in a cluster, it is called a............
6..........is an example of a filamentous alga,
7. Viruses can only be seen through an.............

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Answer 1

Answer:

(i) Colonise

(ii) Spirogyra, Anabaena, Oscillatoria 

(iii) Viruses are so small they can only be seen under an electron microscope

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