DP Biology (first assessment 2025)

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Question 19N.1B.SL.TZ0.2c

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.1B.SL.TZ0.2c
Level SL Paper 1B Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 2]
19N.1B.SL.TZ0.2c
(c)

Explain how the results in the graph could have been obtained.

[2]

Markscheme

a. using a potometer ✔ Accept transpirometer but not respirometer.

b. leafy shoot attached to a reservoir and a graduated «capillary» tube ✔

c. as transpiration increases water uptake «by roots» also increases ✔

d. distance/time for bubble «in capillary tube» to travel is used to measure transpiration rate ✔

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