Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig and the origin and development of stems. Also included are the different modified stems that carry out special functions. ..
Hormones are essential in the regulation of the activity of the various biological systems of the human body. The inefficiency of any of these hormonal control systems may lead to the improper functioning of the body. In this tutorial, get to know the different classes of hormones, metabolism, mechanism, and control of hormone secretions. ..