Assertion: Leaf of mustard can not be torn into pieces with smooth margins but have uneven margins. Reason : Mustard is a dicot and has reticulate venation.

A leaf with reticulate venation can not be torn in to pieces with smooth margins as the venation is in the form of net work due to anastomosis of veinlets. A leaf with parallel venation is can be cut either vertically as in grasses or transversely as in banana into pieces with smooth margins as the venation is parallel.