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Question 18N.3.SL.TZ0.1a

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.3.SL.TZ0.1a
Level SL Paper 3 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 1]
18N.3.SL.TZ0.1a

A variegated Pelargonium plant was grown outdoors in a plant pot. Figure 1 shows one leaf of the Pelargonium. The plant was left in the dark for 24 hours to inhibit photosynthesis. After this time, a sketch was made of the leaf to show the colours (Figure 2), then part of the leaf was covered with black card (Figure 3). Following the exposure of the plant to sunlight for six hours, the black card was removed and the leaf tested for starch (Figure 4).

(a)

Outline a reason for inhibiting photosynthesis for 24 hours.

[1]

Markscheme

to remove any starch already in the leaf
OR
so any starch found in the leaf was made during the experiment
OR
to prevent further production of starch ✔

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