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Write about the elements of Xylem.
a. Xylem vessels are dead cells with lignified walls .
b. Xylem parenchyma helps in the sideways conduction of water .
c. Tracheids and vessels together called tracheary elements because they do not conduct sap.
d. The lignification secondary cell wall is absent in sieve elements and present in phloem fibres .
e. Sieve cells contains sieve plates .
f. Companion cell and sieve tubes function together for the translocation of food .
g. Xylem fibres are elongated lignified living cells with sharp at both the ends and thick cell walls .
h. Xylem vessels are efficient in conducting water due to the presence of perforations .
i. Xylem parenchyma are the only dead cells of xylem with thick cell walls.
j. Xylem parenchyma helps store food such as starch and fatty substances like oil .
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