Biology
Ayush, a student of class 8 was preparing for his biology annual exam but could not understand the terms Receptor, Effector, Stimulus and Response. Which of the following statements explains 'receptor' ?
P. Receptors are sense organs.
Q. Receptors send impulses to CNS through sensory nerves.
R. Receptors receive messages from the central nervous system.
- Only R
- Only Q
- Only P and R
- Only P and Q
Nervous System
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Answer
Only P and Q
Reason — Receptors are the sense organs that receive the stimulus. They send impulses to CNS through sensory nerves. For example, eyes, ears, skin, etc.
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Related Questions
The structural and functional unit of nervous system is
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- Nephron
- Neuron
- Dendron
Peripheral nervous system consists of different types of nerves which connect the central nervous system to all parts of the body. Cranial nerves, spinal nerves, sympathetic and parasympathetic nerves are all connected to different parts of the body. Which of the following does not belong to cranial nerves ?
- Olfactory nerves
- Auditory nerves
- Optic nerves
- Sympathetic nerves
Assertion (A): Synapse is the junction between two neurons which communicates impulses/ messages.
Reason (R): Neurons must be connected with each other through some means in order to transmit the unidirectional flow of impulses.
- Both A and R are true.
- Both A and R are false.
- A is true and R is false.
- A is false and R is true.
Assertion (A): Cerebellum enables us to remember, think and reason.
Reason (R): It is the largest portion of the brain and occupies the whole central area.
- Both A and R are true.
- Both A and R are false.
- A is true and R is false.
- A is false and R is true.