IGCSE O Level Biology Practice Test 136

Tissue Respiration Gas Exchange and Breathing Multiple Choice Questions (MCQ) PDF - 136

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Tissue Respiration Gas Exchange & Breathing Questions and Answers PDF Download: Quiz 136

MCQ 676: Respiration is a/an

A) chemical process

B) mechanical process

C) electrical process

D) oxidation process

MCQ 677: In ecosystem, Biomass is the

A) total mass of living matter at each trophic level

B) total mass of living things in a biosphere

C) total number of living organisms in a given area

D) total energy transferred to each trophic level

MCQ 678: Thick, muscular and elastic walls are characteristics of

A) endothelium

B) arteries

C) veins

D) capillaries

MCQ 679: For excretion, animals with impermeable skin use

A) simple diffusion process

B) produce concentration gradient

C) special excretory glands

D) special excretory organs

MCQ 680: Mycelia is formed through thread like structures called as

A) cilia

B) hypha

C) hydra

D) flagella

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