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Question 18N.3.SL.TZ0.18b

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.SL.TZ0.18b
Level SL Paper 3 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
18N.3.SL.TZ0.18b

The image shows a section through the ileum as viewed under the light microscope.

(b)

Explain how the epithelial cells are adapted for absorption.

[2]

Markscheme

a. microvilli/brush border to increase surface area ✔

b. numerous mitochondria for energy for active transport ✔

c. have transport proteins for specific nutrients ✔

d. single layer of cells/short distance allowing for diffusion ✔

 

Explanation must be included for each characteristic eg: “glucose, amino acids”

Syllabus sections