Q.

Exarch xylem is found in

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a

Petioles   

b

Peduncles    

c

Roots    

d

Stems

answer is C.

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Detailed Solution

In petioles, stems and peduncles the protoxylem is towards the center and metaxylem is towards the periphery and show endarch condition. In roots the xylem is differentiated in centripetal manner with protoxylem towards the periphery and metaxylem is towards the center and shows exarch condition. the naming of exarch, endarch and mesarch is with respect to position of protoxylem in relation to metaxylem.

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