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Solution


Q.

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    [2014]
1 Secondary xylem  
2 Secondary phloem  
3 Protoxylem  
4 Cortical cells  

Ans.

(3)

In stems, the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery. This type of primary xylem is called endarch. In roots, the protoxylem lies towards the periphery and the metaxylem lies towards the centre; such arrangement is called exarch.