CBSE Class-7 Science: Questions 275 - 282 of 322
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Question number: 275
Question number: 276
Question number: 277
Question number: 278
Question number: 279
Question number: 280
Question number: 281
What is a vermicomposting toilet?
Toilets in aeroplane and trains
Toilets in which excreta is treated by earthworms
Toilets which use chemicals to disinfect human waste
|d.||None of the above|