Anatomy and Morphology of Plants
Cortex is the region found between
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Single Choice
Select the correct option:In (i) protoxylem lies towards periphery and metaxylem lies towards centre. Such an arrangement of primary xylem is called as (ii) (i) (ii) stems endrach stems exarch roots endrach roots exarch
AA-stems ,B-endrach
BA-stems , B-exarch
CA-roots, B-endrach
DA-roots, B-exarch
Correct Answer
Solution
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'.
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