Draw a labelled diagram of T.S. of dicot root. Give four differences between internal structure of dicot and monocot root.

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Solution

Character Dicot root Monocot root
Pericycle Gives rise to secondary roots and lateral meristem and is single layered. Gives rise to lateral root only and is two to three layered thick.
Vascular bundles Present 2 to 6 in numbers.(Diarch to hexarch condition) Present more than 6
in number (polyarch condition)
Pith Absent or poorly developed. Abundant and fully developed.
Secondary growth Takes place. Does not takes place.

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Draw illustrations to bring out anatomical difference between

(a) Monocot root and dicot root

(b) Monocot stem and dicot stem

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Character	Dicot root	Monocot root
Pericycle	Gives rise to secondary roots and lateral meristem and is single layered.	Gives rise to lateral root only and is two to three layered thick.
Vascular bundles	Present 2 to 6 in numbers.(Diarch to hexarch condition)	Present more than 6 in number (polyarch condition)
Pith	Absent or poorly developed.	Abundant and fully developed.
Secondary growth	Takes place.	Does not takes place.