Differentiate between the anatomy of a dorsiventral leaf and that of an isobilateral leaf.

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Solution

Character Dorsiventral leaf Isobilateral leaf

Stomata Usually more in number on lower epidermis. Usually equally in number on both epidermis.

Mesophyll cells Differentiated into palisade and spongy parenchyma. Not differentiated into palisade and spongy parenchyma.

Bulliform cells Absent Present. Particularly in grasses.

Vascular bundles Differ in size due to reticulate venation. Nearly same in size due to parallel venation.

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Question 3

The lower surface of leaf will have more number of stomata in a

(a) dorsiventral leaf (b) isobilateral leaf

A dorsiventral leaf has:

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Character	Dorsiventral leaf	Isobilateral leaf
Stomata	Usually more in number on lower epidermis.	Usually equally in number on both epidermis.
Mesophyll cells	Differentiated into palisade and spongy parenchyma.	Not differentiated into palisade and spongy parenchyma.
Bulliform cells	Absent	Present. Particularly in grasses.
Vascular bundles	Differ in size due to reticulate venation.	Nearly same in size due to parallel venation.