Oxygen is harmful for:

  • A
    Nitrogen fixing bacteria
  • B
    Ferns
  • C
    Chara
  • D
    Mango tree

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Name diseases which are caused by:
$(i)$ virus
$(ii)$ bacteria
$(iii)$ protozoa.
(Give two examples for each)

Which one of the following is not a viral disease?

Elephantiasis is caused by

Microbes are classified as:

What do you mean by disease symptoms? Explain by giving two examples.

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