IGCSE O Level Biology Practice Test 137

Exam Preparation: Biology Quiz Questions and Answers PDF Download - 137

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Exam Preparation: Biology Questions and Answers PDF Download: MCQ 137

MCQ 681:

In any ecosystem, the ultimate source of energy is

plants as primary consumers
sun as radiant energy
secondary consumer
heterotroph

MCQ 682:

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

vasodilation
rapid breathing
lower metabolic activity
lesser convection

MCQ 683:

Each nephron consists of

distal convoluted tubule
proximal convoluted tubule
Bowman' capsule
all of above

MCQ 684:

Number of alkaloids in opium are at least

MCQ 685:

Growth of bacteria in hair follicle is prevented through

Chyle
Chyme
sebum
cillia

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