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Science

Reflex action

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.

Medium · Level 2 · 6 questions

TOPIC PRACTICE

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  1. A quick response may occur through the spinal cord, but information later reaches the brain
  2. Reflex action occurs only through hormones
  3. Brain and spinal cord are present in plants
  4. Receptors do not take part in reflex action
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  1. Stimulus to receptor to sensory nerve to spinal cord to motor nerve to effector to response
  2. Receptor to effector to stimulus to sensory nerve to response
  3. Hormone to blood to root to stem to response
  4. Light to pancreas to insulin to muscle to response
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  1. Sensory nerve
  2. Motor nerve
  3. Effector muscle
  4. Thyroid gland
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  1. The pain message never reaches the brain
  2. The spinal cord gives a rapid response and the brain receives information later
  3. The muscle itself understands pain
  4. A hormone instantly moves the hand away
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  1. Long-term growth and changes during adolescence.
  2. Immediate withdrawal of the hand from a hot object.
  3. Immediate withdrawal of the foot after a thorn prick.
  4. Sudden blinking of the eye.
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  1. क्योंकि मांसपेशी को सिकुड़ने के लिए तंत्रिका संदेश चाहिए
  2. क्योंकि मांसपेशी हमेशा अपने आप ही काम करती है
  3. क्योंकि मांसपेशी प्रकाश बनाती है
  4. क्योंकि मांसपेशी इंसुलिन के बिना दिखाई नहीं देती

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