DP Biology (first assessment 2025)

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Question 21N.2.HL.TZ0.5c

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Date November 2021 Marks available [Maximum mark: 2] Reference code 21N.2.HL.TZ0.5c
Level HL Paper 2 Time zone TZ0
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 2]
21N.2.HL.TZ0.5c
(c)

Outline the extension of the stem in plants.

[2]

Markscheme

a. apical meristem (of shoot/stem) produces cells/elongates the stem
OR
cell division/mitosis in tip/apex of shoot/stem;
b. auxin stimulates cell/stem growth/extension/enlargement;
c. elongation of cells causes stem to grow (in length);

Examiners report

Again, accounts were varied, with stronger ones clearly explaining how the shoot apical meristem generates cells by mitosis and how elongation of these cells, stimulated by auxin, causes stem elongation. Some candidates were side-tracked by phototropism but were able to score some marks from among irrelevant ideas.

Syllabus sections