A) sieve tubes
B) metaxylem vessels
C) protoxylem vessels
D) companion cells
Correct Answer: B
Solution :
Vessels or tracheae are cylindrical tube like structures found mainly in the wood of angiosperms i.e., Metaxylem vessels. Cell wall of these cells contains various types of thickenings viz annular, spiral, scalariform, reticulate and pitted.
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