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NEET 2014
Exam
NEET
Year
2014
Subject
Botany
Chapter
Anatomy of Flowering Plants

NEET 2014 · Botany · Anatomy of Flowering Plants

An old piece of dicot stem and a dicot root is given to a candidate...

An old piece of dicot stem and a dicot root is given to a candidate during practical examination. Which of the following anatomical structures can be used to distinguish between the two?

Options

  1. ASecondary xylem
  2. BSecondary phloem
  3. CProtoxylem
  4. DCortical cells

Correct answer

C. Protoxylem

Step-by-step solution

The first formed primary xylem elements are called protoxylem and the later formed primary xylem is called metaxylem. In stems, the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery of the organ. This type of primary xylem is called endarch. In roots, the protoxylem lies towards periphery and metaxylem lies towards the centre. Such an arrangement of primary xylem is called an exarch.
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