DP Biology (first assessment 2025)

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Question 19M.2.SL.TZ2.h

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.SL.TZ2.h
Level SL Paper 2 Time zone TZ2
Command term Identify Question number h Adapted from N/A
h.
[Maximum mark: 1]
19M.2.SL.TZ2.h

Identify, with a reason, the aphids that were most strongly repelled by EBF.

[1]

Markscheme

the aphids that were fed on wild-type thale cress/W as they had 80 % «or more» repelled each generation/ always had the higher % response
OR
the aphids that fed on wild-type thale cress plants/W of G3 as they had «about» 85 % repelled/had the higher % response ✔

Answer should refer to a percentage.

Examiners report

There was some discussion in the G2 forms about the amount of reading before points h, I and j. Good candidates could be seen to have read it carefully, underling the key words. Weaker candidates not so. In 1h a reason in terms of the highest percentage was looked for and was missed by weaker candidates.

Syllabus sections