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Subjects

Science

Reflex action

प्रतिवर्ती क्रिया

In Class 10 Science, the topic Reflex Action explains how the body responds rapidly and automatically to a stimulus, often before the brain can process it fully. Students learn the pathway of a reflex arc: receptors detect a change, sensory neurons carry the impulse to the spinal cord, relay neurons connect it to motor neurons, and effectors such as muscles produce the response. Examples like quickly withdrawing a hand from a hot object show how this protective mechanism works, while the brain later receives information about the action.

Practice questions

In a reflex action, control mainly occurs through which part?EasyLevel 16Pulling the hand back after touching a hot object is an example of what?EasyLevel 17Which organ mainly helps in quick decision-making during a reflex action?EasyLevel 17What is the pathway of a reflex action called?EasyLevel 17In which action does the body respond before conscious thinking?EasyLevel 18Reflex arc is related to which process?EasyLevel 18In which situation is reflex action most useful?EasyLevel 18What is the correct sequence in a reflex arc?MediumLevel 16If the spinal cord is severely injured, what may happen to reflex actions?MediumLevel 16Which is the correct difference between voluntary action and reflex action?MediumLevel 16How is reflex action helpful in protecting the body?EasyLevel 16Why may pain be felt a little after a reflex action?MediumLevel 16How do skin receptors help in detecting a hot object?MediumLevel 16If a student quickly removes the hand from a hot vessel what is the correct sequence of this action?MediumLevel 17Why is reflex action faster than an action involving normal thinking?MediumLevel 18A person pulls the hand away immediately after touching a hot vessel. Which control centre acts first in this action?MediumLevel 18What is the function of the sensory nerve in a reflex arc?MediumLevel 18In a reflex arc in which direction does the motor nerve carry the message?MediumLevel 18Which is a correct example of an effector organ?MediumLevel 18If a student says that the brain never has any role in reflex action, what is the correct correction?MediumLevel 18