Q.

Read the passage given below and answer the following questions from (i) to (v).

Our nervous system is responsible for coordinating human body behaviour and transmitting signals between different body parts. In vertebrates it consists of two main parts known as the Central Nervous System (CNS) and the Peripheral Nervous System (PNS). The CNS consists of the brain and spinal cord. The PNS consists of nerves that are long fibers connecting the CNS to every other part of the body.

 

(i) Which one of the following statements about the nervous system is not correct

1 The process of detecting the signal or the input and responding to it by an output action might be completed quickly.  
2 At the end of the axon, the electrical impulse sets off the release of some chemicals.  
3 Nervous tissue is made up of an organised network of nerve cells or neurons.  
4 An impulse need not to be converted into a chemical signal for onward transmission.  

Ans.

(4)