Biology A H020: Exchange surfaces Topical Past Paper Questions
OCR AS Biology A (H020) past-paper questions on Exchange surfaces, free. This topic is frequently examined across 5 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
The blue whale can grow up to 30m long and can weigh up to 200000kg. Whales have specialised surfaces for gas exchange. Which option is not a reason why blue whales need a specialised surface for gas exchange? A Transport of gases by diffusion is too slow B Whales are multicellul…
The light micrograph shows a transverse section through human lung tissue. (a) Alveoli provide an efficient gas exchange surface because of their large surface area. State one other feature of alveoli that provides an efficient gas exchange surface. (b) The human lung is part of…
An investigation into how a change in sodium chloride concentration effects osmosis in potato cells concluded that the isotonic point of the potato was 0.25 M. Which of the statements, $ \mathbf{A} $ to $ \mathbf{D} $, describes what is happening at the isotonic point? A there is…
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