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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.
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Medium · Level 17 · reflex_arc,sequence,control_pathway,Reflex action,Control and Coordination,Science,Class 10 MCQView options
Stimulus to receptor to sensory nerve to spinal cord to motor nerve to effector to response
Receptor to effector to stimulus to sensory nerve to response
Hormone to blood to root to stem to response
Light to pancreas to insulin to muscle to response
Medium · Level 18 · reflex arc,sensory nerve,nervous system,Reflex action,Control and Coordination,Science,Class 10 MCQView options
Sensory nerve
Motor nerve
Effector muscle
Thyroid gland
Medium · Level 18 · reflex action,pain perception,spinal cord,Control and Coordination,Science,Class 10 MCQView options
The pain message never reaches the brain
The spinal cord gives a rapid response and the brain receives information later
The muscle itself understands pain
A hormone instantly moves the hand away
Medium · Level 18 · endocrine control,growth,adolescence,Reflex action,Control and Coordination,Science,Class 10 MCQView options
Long-term growth and changes during adolescence.
Immediate withdrawal of the hand from a hot object.
Immediate withdrawal of the foot after a thorn prick.
Sudden blinking of the eye.
Medium · Level 18 · effector,muscle,nervous system,Reflex action,Control and Coordination,Science,Class 10 MCQView options
क्योंकि मांसपेशी को सिकुड़ने के लिए तंत्रिका संदेश चाहिए
क्योंकि मांसपेशी हमेशा अपने आप ही काम करती है
क्योंकि मांसपेशी प्रकाश बनाती है
क्योंकि मांसपेशी इंसुलिन के बिना दिखाई नहीं देती
Question 1MediumLevel 17
Which option gives the most complete sequence of a reflex arc?
Correct answer: A
The reflex arc follows a fixed functional sequence. A stimulus is detected by a receptor, and a sensory neuron carries the impulse to the spinal cord for rapid processing. A motor neuron then carries the outgoing impulse to an effector, such as a muscle or gland, which produces the response. Option A includes every essential stage in the correct order. The other sequences mix unrelated organs or reverse the pathway.
If skin receptors are active but the message is not reaching the spinal cord, which part of the reflex arc is most likely affected?
Correct answer: A
In a reflex arc, the receptor detects the stimulus and the sensory nerve carries the impulse from the skin towards the spinal cord. Since the receptors are already active but the message fails before reaching the spinal cord, the sensory nerve is the most likely damaged part. A motor nerve carries commands away from the spinal cord, the muscle performs the response, and the thyroid is unrelated here.
In a reflex action, the hand moves away first and pain is felt later. What is the most suitable reason?
Correct answer: B
A reflex action is organised for speed and protection. Sensory information enters the spinal cord, which rapidly sends a motor command to withdraw the hand before conscious interpretation is completed. The same event is then communicated to the brain, where pain is consciously recognised. Thus option B is correct. The message does reach the brain; muscles do not interpret pain, and hormones are not responsible for this immediate pathway.
In which situation is endocrine control more suitable than nervous control?
Correct answer: A
Nervous control uses fast electrical impulses and is well suited to immediate, short-lived actions such as withdrawing from heat or blinking. Endocrine control uses hormones released into the blood; it generally begins more slowly, but its effects can be widespread and persist longer. Growth and the physical changes of adolescence require sustained regulation over time, so option A is the best answer. The other options are rapid protective responses better served by nerves.
If an effector muscle is normal but receives no response message, why will it not respond?
Correct answer: A
The governing concept is the role of an effector in a response pathway. A muscle is an effector that contracts only after receiving an appropriate motor nerve impulse from the nervous system. Thus, even a structurally normal muscle will not act when the response message is absent, making option A correct. It does not work independently, produce light, or require insulin simply to be visible.
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