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Edexcel A-Level Biology AS 2.1 Gas Exchange Surfaces and Ficks Law Questions

Practise calculating surface area and ratios, linking gas-exchange adaptations to diffusion distance and concentration gradients, and applying Fick’s Law to biological data.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • Calculate surface area, volume or surface-area-to-volume ratio with correct units.
  • Explain gas-exchange adaptations through area, diffusion distance and gradients.
  • Apply Fick’s Law to predict or compare diffusion rates from biological data.

Edexcel A-Level Biology AS 2.1 Gas Exchange Surfaces and Ficks Law Questions question 1

[Maximum number: 3]

Hydra are small animals that live in water.
They have a cylindrical body.
The drawing shows a hydra.

Figure for Question Edexcel A-Level Biology AS 2.1 Gas Exchange Surfaces and Ficks Law Questions question 1 — Edexcel A-Level Biology AS

A hydra has a hollow body that is made up of two layers of cells.

Explain how a hydra is adapted for gas exchange.

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