Page 1 - 2.3-Home assignment-II (Worksheet-5)-Hormones in Animals, Feedback Mechanism
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SAI International School
                                           Std -X, Subject- BIOLOGY
                                     Chapter- Control and Coordination
                        Sub Topic- Hormones in animals, feedback mechanism
                                                     Module- 15
                                                    Worksheet- 5

           Q.1    Coordination via the nervous system tends to differ from that produced by the
                  endocrine system because the nervous system:
                     (a) is quick, precise and localized
                     (b) is slower and more pervasive
                     (c) does not require conscious activity
                     (d) has long-lasting effects

           Q.2    Which part of the human brain is most well-developed?
                  (a) Forebrain                  (b) Hindbrain
                  (c) Diencephalon              (d) None of these

           Q.3    The photoreceptor cells of the eye are located in the:
                  (a) Sclera               (b) Iris
                  (c) Retina       (d) Optic nerve

                  DIRECTION : The following question consist of two statements - Assertion (A) and
                  Reason (R). Answer these questions selecting the appropriate option given below:
                     a)  Both A and R are true and R is the correct explanation of A.
                     b)  Both A and R are true but R is not the correct explanation of A.
                     c)  A is true but R is false.
                     d)  A is false but R is true.
                     e)  Both Assertion and Reason are false.

           Q.4    Assertion : Reflex actions are automatic and rapid responses to stimuli.
                  Reason : These actions are controlled by brain.

           Q.5    Assertion : Medulla oblongata causes reflex actions like vomiting, coughing and
                  sneezing.
                  Reason :  It  has  many  nerve  cells  which  control autonomic reflexes.
           Q.6    What happens at the synapse between two neurons?

           Q.7    Define reflex arc and draw a diagram of reflex arc and label in it sensory neuron, motor
                  neuron, relay neurons, receptors.

           Q.8    How are the brain and spinal cord protected?


           Q.9    What is feedback mechanism? Explain with the help of an example.

          Q.10  Why is it important to have iodised salt in our diet?
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