(a) Are xylem vessels living or dead?
(b) Suggest why removing the bark and the layers down to the xylem can kill the tree. [3 MARKS]

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Solution

a) 1 Mark
b) 2 Marks

(a) Xylems vessels are dead because they have no cytoplasm.

(b) Removing the bark and the layers down to the xylem damages the phloem which in turn cuts off the food supply to the roots ultimately killing the tree.

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Q. Tracheae or xylem vessels are usually .

Why are xylem and phloem are called vascular or conducting tissues? [1 MARK]

Annual rings are the number of :
(a) Internodes in a stem
(b) Rings of vascular bundles in a monocot stem.
(c) Barks layers in a woody stem.
(d) Layers of Xylem in a stem.

Question 25
A long tree has several branches. The tissue that helps in the sideways conduction of water in the branches is
(a) collenchyma
(b) xylem parenchyma
(c) parenchyma
(d) xylem vessels

What is xylem tissue ? Name the two kinds of cells in xylem tissue. State whether these cells are living or dead.

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(a) Are xylem vessels living or dead? (b) Suggest why removing the bark and the layers down to the xylem can kill the tree. [3 MARKS]

a) 1 Mark b) 2 Marks (a) Xylems vessels are dead because they have no cytoplasm. (b) Removing the bark and the layers down to the xylem damages the phloem which in turn cuts off the food supply to the roots ultimately killing the tree.

(a) Are xylem vessels living or dead?
(b) Suggest why removing the bark and the layers down to the xylem can kill the tree. [3 MARKS]

a) 1 Mark
b) 2 Marks

(a) Xylems vessels are dead because they have no cytoplasm.

(b) Removing the bark and the layers down to the xylem damages the phloem which in turn cuts off the food supply to the roots ultimately killing the tree.