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Solution


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.

 

(iii) Which one is the correct sequence of event when bright light falls on our eyes
1 Sensory neuron → Brain → Motor neuron → Effector muscles in the eye → Eye muscle contracts → Receptors in eyes
2 Receptors in eyes → Brain →Sensory neuron →Motor neuron → Effector muscles in the eye → Eye muscle contracts
3 Receptors in eyes → Effector muscles in the eye → Sensory neuron →Brain → Motor neuron → Eye muscle contracts
4 Receptors in eyes → Sensory neuron → Brain → Motor neuron → Effector muscles in the eye →Eye muscle contracts

Ans.

(4)