DP Biology (first assessment 2025)

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Question 20N.1B.SL.TZ0.1b

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1B.SL.TZ0.1b
Level SL Paper 1B Time zone TZ0
Command term Predict Question number b Adapted from N/A
b.
[Maximum mark: 1]
20N.1B.SL.TZ0.1b
(b)

The mean stomatal density for the lower epidermis of P. decandrum was around 600 per mm2. Predict how the stomatal density for the upper epidermis would compare.

[1]

Markscheme

(upper surface/epidermis usually has) fewer stomata/lower stomatal density/no stomata/OWTTE

Do not accept a numerical value only.

Examiners report

Most predicted that the upper epidermis would have a lower density, although some stated the reverse.

Syllabus sections