open systems closed systems

A system is said to be heterogeneous if it consists of parts separated by definite boundaries, each of which has different physical and chemical properties. A mixture of fertilizer granules (N P K) or ice with water are typical examples of this system..

River system, which collect the rain water fallen on land to convey it to sea / ocea..

Following are the common system of units to measure mass, length and tim..

Nervous system is well developed. It is represented by a nerve ring and a double, ventral nerve cord. The nerve ring is formed by a pair of supra oesophageal ganglia, a pair of suboesophageal ganglia and a pair of circum oesophageal connectives. The nerve cord produces segmental ganglia...

The Solar System - The solar system consists of the sun and all the objects that travel around it. The solar system includes the earth and eight other planets, along with the satellites (moons) that travel around most of them; planet like objects called asteroids; chun..

The circulatory system is well developed. It is represented by a heart, blood vessels and blood. Heart is four chambered, with a clear separation of deoxygenated and oxygenated blood. Its functioning is described as double circulation. It consists of a pulmonary circulation and a sys..

It consists of a pair of lungs, a pair of bronchi and a trachea. The lungs contain numerous microscopic functional units called alveoli. These structures are involved in pulmonary respiration. In addition, there is buccal respiration, through the buccal cavity and cutaneous respiration through the ..

The lymphatic system is an accessory circulatory system which transports lymph, a fluid similar to plasma from the intercellular spaces of tissues to the blood. It is a one way route for the movement of interstitial fluid to blood. The lymphatic system can carry ..

The solar system consists of the sun and all the objects that travel around it. The solar system includes the earth and eight other planets, along with the satellites (moons) that travel around most of them; planet like objects called asteroids; chunks of iron and stone ca..

Skeletal system or the skeleton forms the bony framework of the body providing support and protection for some of the soft organs, particularly in the skull and pelvis; acting as levers in movements and providing surfaces for the attachment of the skeletal muscles. In certain parts ..