IB Biology HL 2.1.12 Cell proliferation Question Bank

Practise IB Biology HL 2.1.12 by applying cell proliferation concepts to exam-style questions.

Exam points

identify the relevant biological structure, process or evidence
apply the correct biological mechanism to the question
evaluate the result using data, adaptation or ecological reasoning

[Maximum number: 4]

(a)

The photomicrograph shows a section of onion (Allium cepa) root tip cells.

× 1000

[ 2 ]

(i)

Describe how a mitotic index could be obtained from this image.

[ 2 ]

(b)

Cadmium is a heavy metal that can cause environmental problems. Cadmium ions are released from various human activities such as the release of sewage sludge, mining and industrial processes. Plants take up cadmium ions and they enter food chains.

A study was carried out to look at the effect of various concentrations of cadmium ions on the mitotic index of the apical meristem of root cells from 4-day-old wheat (Triticum aestivum) seedlings.

[ 2 ]

(i)

State the effect of cadmium ion concentration on the mitotic index of root cells from wheat seedlings.

[ 1 ]

(ii)

Suggest the effect the change in mitotic index would have on the wheat plant.

[ 1 ]

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D2.1.12 (HL)—Cell proliferation question 1

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Question (b)

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