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Edexcel IAL Biology 2.1 Gas exchange surfaces and Fick's Law

State the adaptation, connect it to the correct term in Fick's Law and use surface-area, volume or gradient values to justify the predicted diffusion rate.

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.

2.1—Gas exchange surfaces and Fick's Law 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 2.1—Gas exchange surfaces and Fick's Law 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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