structures and function in living systems

Structure of Cell - Cells vary in shape and size. They may be oval, spherical, rectangular, polygonal, spindle shaped, star shaped, rod-shaped or totally irregular like the nerve cell. The diversity in cells is in accordance with the role or function it has to perform as part of..

Structure of the Human Digestive System - The structure of the human digestive system is adapted to the omnivorous diet. The human digestive system consists of an alimentary canal, which is approximately 8 metres long. The alimentary canal carries o..

The digestive system is an organ system. An organ system is a collection of organs which together carry out a life process. Human Digestive System..

The characteristic structure of an ecosystem is obtained by the systematic physical organisation of the abiotic and biotic components of that particular ecosyste..

> hybrid carbon of an aromatic ring. The bond angle This is due to partial double bond character on account of the conjugation of unshared electron pair of oxygen with the aromatic ri..

Summary - The cells of all living organisms consist of protoplasm, which is bound by a cell membrane. Prokaryotic cells and cells of algae, fungi and higher plants contain a cell wall outside the cell membrane. Some protozoans cells show the presence of a cell coat outside the cell membra..

Introduction - The present system of classification, recognises the living organisms under five kingdom..

Ear - Structure - Man has a pair of ears that function as the organs of hearing and the organs for equilibrium. It has two different structures for each of these functions. Both these structures have receptors that convert the vibrations into nervou..

There are certain structures associated with the eyes and carry out, mainly, the function of protection. These structures ar..

There appear to be many structures that are similar because of the function they carry out and in their external appearance. However, these structures differ internally. Such structures are called analogous structures. For example, wings of bat and..