Life Processes

In this topic, we shall study various life processes. We will also study the procedure of functioning of every body part of the living organism and the necessity of food, water and oxygen in order to survive.

The topic states that the energy required by every living organism for its survival is obtained from nutrition. The two modes of nutrition are autotrophic (producers) and heterotrophic (consumers). Humans have a digestive system for the breakdown and assimilation of food.

This topic explains respiration, a process of oxidation of digested food by the oxygen inhaled during breathing. There can be aerobic and anaerobic respiration. During respiration, glucose is used to produce the energy within a cell, with the help of mitochondria.

This topic explains how the circulatory system helps the movement of gases, blood and other required nutrients from one part of the body to another. In humans, it is performed by blood vessels, while in plants it is performed by vascular tissues.

This topic discusses excretion, a process by which nitrogenous wastes are removed from the body. Humans have an excretory system consisting of organs for excretion. However, in plants, it is done by transpiration through leaves, shedding of dry leaves, barks, etc.