Question

In root,

1.Endarch arrangement is present

2.Exarch arrangement is present

3 Protoxylem lies towards the centre

4. Metaxylem lies towards the periphery​

Answer 1

Answer:

Endarch condition involves the development of protoxylem from the innermost procambial cells adjacent to pith. Development is inward to outward. Hence, protoxylem is found inside to metaxylem . This is considered to be centrifugal pattern of arrangement. It is found in stems.

Exarch condition involves the development of protoxylem from the outermost edge of procambial cylinder. Development is from outside to inside. Protoxylem is found outside the metaxylem . This is considered to be centripetal pattern of arrangement. It is found in roots.

So, the correct option is 'A-roots, B-exarch'.