Exam Preparation: Biology Learning App | IGCSE O Level Biology Quiz e-Book PDF

IGCSE O Level Biology MCQs (O Level) From Textbook

IGCSE O Level Biology MCQs – Mock Test 137

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Exam Preparation: Biology Quiz – Mock Test 137 PDF Download

MCQ 681: In any ecosystem, the ultimate source of energy is:

  1. plants as primary consumers
  2. sun as radiant energy
  3. secondary consumer
  4. heterotroph

MCQ 682: If heat loss center is activated in hypothalamus, the control mechanism include all, but:

  1. vasodilation
  2. rapid breathing
  3. lower metabolic activity
  4. lesser convection

MCQ 683: Each nephron consists of:

  1. distal convoluted tubule
  2. proximal convoluted tubule
  3. Bowman' capsule
  4. all of above

MCQ 684: Number of alkaloids in opium are at least:

  1. 20
  2. 25
  3. 30
  4. 35

MCQ 685: Growth of bacteria in hair follicle is prevented through:

  1. Chyle
  2. Chyme
  3. sebum
  4. cillia

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