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Life Sciences Paper 1, November 2024, question 3.5.3

Life Sciences P1 · Responses in plants and hormones
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A learner investigated how a plant hormone affects the way shoots bend towards light. The investigation was done as follows: - Fifteen seedlings of the same species were split into three groups, X, Y and Z, with five seedlings in each group. - All the seedlings were kept in a dark cupboard for 48 hours. - The shoot tips of group X were left untouched. - The shoot tips of group Y were removed and each was replaced with a block of agar jelly containing auxins. - The shoot tips of group Z were removed and each was replaced with a block of agar jelly containing no auxins.
3.5.32 marks
Explain how the researchers made sure the results of this investigation were reliable.

NSCBased on Nov 2024 · Paper 1 · Q3.5.3

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What examiners found

Candidates counted all the plants together as the sample size, though the groups were treated differently and each group was small (four plants in the DBE question).

In our words. Source: Department of Basic Education, NSC 2024 Diagnostic Report, Part 1 (Book 1), Q3.5.3.

Updated