Osmoregulation, Thermoregulation, Excretion, Homeostasis

(i) Osmoregulation :

The adjustment of internal osmotic pressure of a body in relation to that of the environment is called osmoregulation.

OR

The regulation of gain and loss of water and solute in an organism in response to environment factors is known as osmoregulation.

(ii) Thermoregulation :

The adjustment of temperature of body in changing temperature of environment is called thermoregulation.

(iii) Excretion :

The process of removal of waste products or nitrogenous wastes which are formed during metabolism, and not needed in the body.

(iv) Homeostasis

The self regulating process which maintains a steady internal condition or physiology with a constantly changing environment is called homeostasis.