2. Define the following terms.
Control and Coordination, Tropism, Homeostasis
Answers
Answers :-
Control and coordination is defined as the working of various organs of the body in a proper manner to produce proper reaction to a stimuli is called control and coordination.
[ Stimuli :- The changes in the environment to which the organisms respond and react is called stimuli ]
Example :- In humans control and coordination done by nervous system and endocrine system.
In Plants , Control and coordination done by hormonal system.
Tropism :- Directional movements or orientations of specific part of a plant revealing growth in response to external stimuli are called tropism or tropic movements.
[ Tropic movements are induced growth movements of curvature that occurs due to differential growth. These are directional movements or orientations that occur in response to external stimuli such as light, force of gravity, chemicals and water etc. When some stimulus is recieved by the plant , specific part of the plant shows response in the form of growth movement due to unequal growth in its two sides by the action of plant growth hormones ]
Examples :- Stem or shoot of a growing plant moves towards light .
Roots of a plant move away from light.
Homeostasis :- It may be defined as a property of cell , tissue, organisms which allows the maintenance and regulation of stability and constancy to function properly .
Examples :- In humans, When someone is healthy , their body maintains a temperature 98.5 °F as it is needed for warm blooded organisms like humans