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Control and Coordination — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceControl and Coordination1 Mark
MCQ
Which of the following shows correct reflex arc?
  • ✓
    Sensory organ $\rightarrow $ Spinal cord $\rightarrow $ Effector organ.
  • B
    Sensory organ $\rightarrow $ Brain $\rightarrow $ Effector organ.
  • C
    Effector organ $\rightarrow $ Brain $\rightarrow $ Sensory organ.
  • D
    Effector organ $\rightarrow $ Spinal cord $\rightarrow $ Sensory organ.
✓

Answer

Correct option: A.
Sensory organ $\rightarrow $ Spinal cord $\rightarrow $ Effector organ.
This tells that neurons are the medium by which stimuli is sent to the brain and then to the action centre where the response has to occur.
Like this :
Stimulus $\rightarrow $ Receptor organ $\rightarrow $ Sensory nerve $\rightarrow $ Spinal cord $\rightarrow $ Effector organs $\rightarrow $ Response.

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