Science 'N' us-5 final - School Books Publishers India

4. What do you understand by reflex action? Which part of nervoussystem is responsible for it?Ans. Although, brain controls our all actions and reactions but still there arecertain actions that take place so automatically that we do not get achance at all to think about. For example on touching a hot water kettle,we withdraw our hand quickly even before we feel the burn. Suchimmediate, automatic actions are called reflex actions. These actionsare controlled by the spinal cord without any involvement of brain.5. How does skin act as a sense organ?Ans. The skin forms a covering for the entire surface and protects the internalorgans. There are tiny nerve endings in our skin. These nerve endings helpus to feel things. They also help us to detect cold, heat and pain.B. Choose the correct word from side box and fill in the blanks :1. Cerebrum is the largest part of human brain. brain2. The ears help us in hearing sounds. brain stem3. Reflex actions do not involve the brain. largest4. Sensory nerves carry messages from the sens organs. ears5. Medulla is also known as brain stem. sensoryC. Write True or False against the following statements :1. Plucking a flower is a reflex action. False2. The sense of smell and sense of taste are interlinked. False3. Cerebrum is called the little brain. False4. Ears can be cleaned using hair pin False5. The eyes are the organs of touch. FalseFlowchartFill up the boxes to complete the flowcharts :(a)Parts of Nervous Systemnervesbrainspinal cord(b)sensorymotormixedSense Organscerebrumcerebellumseetasteeyes hear tongue smellearsnoseLet us Enjoy1. Enjoy to make a neat, labeled diagram of human brain.Ans. Do yourself.2. Make a list of any ten examples of reflex actions.Ans. Do yourself.medullafeelskinHorizon Press115Science 'n' Us - 1 to 5