Science For You

CONTROL AND CO-ORDINATION Living organisms respond to various stimuli like heat, light, cold, touch, pressure etc. Example : Withdrawal of hand on touching a hot object. Control and Coordination in Animals It is brought about in all animals with the help of two main systems (a) Nervous System (b) Endocrine System Nervous System : Consists of Brain,Spinal network and a huge network of nerves. Functions (i) To receive the information from environment (ii) To receive the information from various body parts. (Stimuli  Response) (iii) To act accordingly through muscles and glands. Stimulus :  Any change in environment to which the organisms respond is called stimulus. E.g., touching a hot plate. Response :  The reaction of our body to a stimulus. E.g. withdrawal of our hand on touching hot plate. Coordination– The working together of various organs of the body of an organism in a proper manner to produce appropriate reaction to a stimulus is c

Environment  :-  The sum of biological and physical factors, along with the chemical interactions that affect an organism is known as the environment. All components of biosphere interact with each other in an organised manner. This organised interaction assures the survival of an organism that may result in the gradual evolution of the respective organism in the biosphere. An Environment is everything that is around us, which includes both living and nonliving things such as soil, water, animals and plants, which adapt themselves to their surroundings. It is nature’s gift that helps in nourishing the life on the earth. The environment plays an important role in the existence of life on the planet earth. The word Environment is derived from the French word “Environ” which meaning “surrounding.” An ecosystem refers to all the living and the non-living things present in the environment and it is a foundation of the Biosphere, which determines the health of the ent