Lesson: Chapter 1 — Living Tissues

Xylem 5 of 5 Reset answers

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Question 5

Why is the trunk of a tree strong?

A Because it is very largely xylem, whose lignified cells are laid down ring by ring B Because collenchyma forms a cylinder round it C Because of the epidermis on the outside D Because it is full of turgid parenchyma cells

The right answer is the one marked above.

Because it is very largely xylem, whose lignified cells are laid down ring by ring. Wood is xylem, added a layer at a time by the cambium.

It also explains why a plank splits more easily along the grain than across it: the fibres run the length of the trunk.

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