In this article we will discuss about the secretory structures in plants, explained with the help of suitable diagrams. The group of cells concerned in secretion of cutin, wax, suberin etc. is generally termed as secretory structures. The term secretion includes excretion and recretion also. The term secretion implies the act of separation of by-products of metabolism from protoplast. These [...]
In this article we will discuss about the distribution of stomata on leaves. Stomata most frequently occur on regions over the chlorenchymatous mesophyll cells of leaf. Stomata do not occur over the fibre bundles of veins. They also do not occur over the sclerenchyma present on the leaf margins. In majority of monocotyledons where the veins are parallel, e.g. Graminsae, [...]
Before illustrating the ontogeny of stomatal complex it may be useful to have a precise definition of the following terms which are used in this essay. The definitions are in accordance with Pant (1965). i. Stoma: It includes the pore and two guard cells. ii. Stomatal complex/stomatal apparatus: It includes a stoma and the adjoining subsidiary cells. It also includes [...]