Give four anatomical differences between a dicot and monocot root.

Solution

DICOT ROOT

An inconspicuous pith or may be absent as well.
Mostly the number of xylem bundles are 4–6. So tetra or hexaxylic condition.
Pericycle (a thin parenchymatous circular layer inner to the endodermis) gives rise to lateral roots and secondary meristem (cambium & phellogen).
Cambium appears as a secondary meristem.
Secondary growth is seen cutting the secondary xylem towards the inner side and secondary phloem towards the outer side.

E.g. Root ot wheat.

MONOCOT ROOT

A very well developed parenchymatous central pith is present
Xylem shows polyarch condition. Exception= Allium cepa (onion).
Pericycle forms only lateral roots but no secondary meristem.
No cambium is present between xylem and phloem.

E.g. Zea mays

Both dicot and monocot roots have radial & exarch xylem.

Some More Questions From Evolution Chapter

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Evolution

Give four anatomical differences between a dicot and monocot root.

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