O Level Biology MCQs (O Level) From Textbook

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MCQs – Certification Test 960

Pesticides: O Level Biology Quiz (Question 960) – App & eBook Download

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MCQ: 960

Presence of tubifax worms indicate that

  1. the parasites are found in the intestine
  2. cellulose in grass can easily be digested by pri-consumers
  3. water is highly polluted
  4. BOD is very low

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