Class 7 Science MCQs (Grade 7) From Textbook

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Class 7 Science Learning Guide: Certification Test 403

Safe and Drinking Water MCQ App & e-Book: MCQ 403

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MCQ: 403

Fish in the ponds and lakes die because the algae

  1. takes all the minerals from water
  2. takes all the oxygen from water
  3. prevents sunlight to enter water
  4. prevent from respiring
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