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Date November 2018 Marks available 1 Reference code 18N.3.SL.TZ0.3
Level Standard level Paper Paper 3 Time zone TZ0 / no time zone
Command term Calculate Question number 3 Adapted from N/A

Question

The micrograph shows mitosis in a cell of an onion (Allium cepa) root tip.

Deduce, with a reason, which stage of mitosis is shown.

[2]
a.

The cells visible in the onion root tip were classified and counted.

Calculate the mitotic index.

[1]
b.

Markscheme

a. telophase ✔

b. chromatids/chromosomes have been pulled to the poles of the cell
OR
«2» new/daughter nuclei forming ✔

 

Do not accept cytokinesis

a.

0.3 or 30 % ✔

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Core » Topic 1: Cell biology » 1.6 Cell division
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