DP Biology (first assessment 2025)

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Question 22N.1A.HL.TZ0.32

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1A.HL.TZ0.32
Level HL Paper 1A Time zone TZ0
Command term Question number 32 Adapted from N/A
32.
[Maximum mark: 1]
22N.1A.HL.TZ0.32

The apparatus is set up to measure the rate of transpiration. As transpiration occurs from the leafy shoot, water is drawn through the apparatus and is measured by timing the movement of the air bubble along the capillary tube.

Which variable(s) must be controlled if transpiration rates are compared in different plant species?

I.   Total leaf surface area

II.  Volume of water in the reservoir

III. Room temperature

A.  I only

B.  III only

C.  I and III only

D.  I, II and III

[1]

Markscheme

C

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