What type of vascular bundles are found in Isobilateral type of leaves ?

In a dorsiventral leaf, the vascular bundles are surrounded by a layer of thick-walled cells. These

Which of the following statement is not true regarding the internal structure of flowering plants?

Bundle sheath is made up of parenchymatous cells:

Select the correct combination of the statements regarding the characteristics of middle lamella a.

Thickening material present in wall of collenchyma is