A) sclereids
B) sclerenchyma fibres
C) secondary phloem
D) secondary xylem
Correct Answer: D
Solution :
Tyiosis is an outgrowth from xylem parenchyma in the xylem vessels, produced in response to either severe water shortage or more usually to the presence of pathogenic organisms. The growth of tyioses often causes the vessels to become blocked, so prevent water transport.
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