Subject :NSO Class : Class 5
Observe the given diagram carefully which shows a reflex arc. What will happen if the orientation of neuron Q is made as of neuron P?
AAll voluntary movements of body including reaction to heat will stop.
BThe sensory receptor will not get stimulus from the candle.
CThe motor organ will not be able to get instructions from the spinal cord.
DNone of these
Ans 1:
Class : Class 5
C is correct
Ans 2:
Class : Class 7
Ans 3:
Class : Class 6
this question is so hard
Ans 4:
Class : Class 6
Ans 5:
Class : Class 8
Ans 6:
Class : Class 6
Observe the given diagram carefully which shows a reflex arc. The diagram is show a finger touching the flame of the burning candle. The Sensory Neuron P takes the message of the burning finger to the Relay Neuron R in spinal cord. The Motor Neuron Q takes the message from the Relay Neuron R to the related muscle to act accordingly and pull the finger away. Now, if the orientation of Motor Neuron Q is changed (red arrow) and made as that of Sensory Neuron P, that means message from Motor Neuron Q will go from Muscle to the Relay Neuron R. Now, letâs check the following options to see what will happen: A.All voluntary movements of body including reaction to heat will stop. ----- Incorrect. Reaction to heat is an involuntary reflex response. It will stop if the orientation of Motor Neuron Q is changed. But voluntary movements of the body, which are in control of our brain, will go on. B.The sensory receptor will not get stimulus from the candle. ----- Incorrect. The orientation of Sensory Neuron P is still the same, so sensory receptors in spinal cord will continue to get the stimulus of heat from the candle. C.The motor organ will not be able to get instructions from the spinal cord. ----- Correct. The orientation of Motor Neuron Q has been changed, so instruction from spinal cord will not reach the motor organ (muscle). It will go from muscle to the spinal cord instead. D.None of these ----- Incorrect. Hence, the right answer is Option C.
Ans 7:
Class : Class 5