CBSE Class 11-science Answered

Hi Vikas,

When you cut a transverse section of the leaf, look for the anatomical differences in the epidermis, mesophyll region and the vascular system under the microscope in order to identify whether the leaf is dorsiventral or isobilateral.

The leaf would be dorsiventral if you observe that:

1. The number of stomata is more on the abaxial epidermis than on the adaxial epidermis.
2. Mesophyll cells are differentiated into palisade and spongy parenchyma.
3. Vascular bundles are present in midribs and veins.

In this case, the leaf would be of a dicot plant.

The leaf would be isobilateral if you observe that:

1. The number of stomata on the abaxial and adaxial epidermis is equal.
2. Mesophyll cells are not differentiated into palisade and spongy parenchyma.
3. Vascular bundles are arranged in a parallel manner.

In this case, the leaf would be of a monocot plant.