DP Biology (first assessment 2025)

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Question 23M.1A.SL.TZ1.33

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1A.SL.TZ1.33
Level SL Paper 1A Time zone TZ1
Command term Question number 33 Adapted from N/A
33.
[Maximum mark: 1]
23M.1A.SL.TZ1.33

The micrograph shows tissues in a plant stem.

What is the reason that no nucleus is visible in Z?

A.  Xylem vessels are formed from dead lignified cells.

B.  Staining of cells destroys their nucleus.

C.  Phloem companion cells lack a nucleus.

D.  The nucleus is too small to be seen in a light microscope slide preparation.

[1]

Markscheme

A

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