In this article we will discuss about the stoma in a plant. This will also help you to draw the structure and diagram of stoma in plant. A stoma consists of two guard cells that surround an aperture. In the extinct Devonian Pteridophyte Zosterophyllum myretonianum and Z. ilanoveranum had one guard cell with an aperture in its centre that simulates [...]
In this article we will discuss about the evolution of stelar forms in vascular plants. The well known genus Rhynia represents the simplest kind of vascular plant. It is rootless, leafless and the axis is dichotomously branched. A stele runs through the centre of stem. The cells in the very centre of stele consist of tracheids only and this xylem [...]
Followings are a few reasons for the great interest in stoma: Stoma provides characters of taxonomic significance. This is due to the fact that genera and even families show great constancy for their possession of a particular stomatal complex. The study of stomatal complexes becomes very useful to understand the evolutionary relationship of plants when the classical methods of cytology [...]