IB myp 4-5 Biology – Practice Questions- All Topics
Topic :Metabolism-Gas Exchange
Topic :Metabolism– Weightage : 21 %
All Questions for Topic : Nutrition,Digestion,Biochemistry and enzymes,Movement and transport,Diffusion,Osmosis,Gas exchange,Circulation,Transpiration and Translocation,Homeostasis
Question:
Deduce whether the reactions that change ethanol into ethanoic acid are oxidations or reductions.
▶️Answer/Explanation
Ans: Ethanol to ethanal is an oxidation; ethanal to ethanoic acid is also an oxidation.
Question:
Suggest reasons for the high concentration of carbon dioxide and low concentration of oxygen in air in the cave.
▶️Answer/Explanation
Ans: Cell respiration by animals/bacteria in the cave; which uses oxygen; and produces carbon dioxide; no light so no photosynthesis to resupply oxygen.