NEET 2014 Biology question

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?

(1)Secondary xylem
(2)Secondary phloem
(3)ProtoxylemCorrect
(4)Cortical cells

Answer: (3)

Solution

In an old dicot stem and an old dicot root both show secondary growth, so secondary xylem, secondary phloem and cortical cells look alike. The position of protoxylem differs: in the stem the xylem is endarch

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Question ID VK-091573