O-LevelBiologyEcology & Environment5090/22 · May/June 2018 · Q111 Marks

The diagrams show the bud of an insect-pollinated flower and a magnified transverse section through the same flower bud. The transverse section was taken at the position shown by the dotted line. [Figure: Insect-pollinated flower bud and magnified transverse section with labels A, B, C, D]

(a)Complete the table to show the name of each of structures A to D and to state one function of each structure. letter | name of structure | function ---|---|--- A | | B | | C | | D | | [8]
(b)(i)The diagram shows an incomplete transverse section through the stem of this plant. [Figure: Incomplete transverse section through the stem] Complete the diagram by drawing and labelling the positions of each of the following tissues: • xylem, • phloem.[2]
(b)(ii)State one function of xylem tissue.[1]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Mark scheme

Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.

[8] (A) sepal / calyx ; protect ;
(B) petal / corolla ; attract / landing platform ;
(C) stamen / anther ; produces / contains AW + pollen / male gamete / male nucleus ; or filament ; support anther ;
(D) ovary / carpel / pistil ; produces / contains AW + ovum / ovule / egg / female gamete ; or forms AW fruit / site of fertilisation ;
[2] 1 one or more vascular bundles + each oval shaped + location correct ;
2 'xylem' labelled on inside + 'phloem' labelled separately on outside of at least one oval vascular bundle;
[1] 1 transports / carries AW + water / ions / minerals ;
2 support;

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