Q1. [3] deep thorough-understanding
A buffalo continuously chews cud even when there is no new food in its mouth, while a child on a swing pumps her legs in response to feeling herself slow down. Classify each movement as voluntary, involuntary, or reflex, giving a reason for each. Are either of these movements a direct response to an environmental stimulus? Justify your answer.
Generated by claude-sonnet-4-6 · 2026-06-26 01:00 · grounding rag
Model Answer
Buffalo chewing cud — This is an involuntary action. The buffalo does not consciously decide to chew; it happens automatically, controlled by the mid-brain/hind-brain without deliberate thought.
Child pumping legs on a swing — This is a voluntary action. The child consciously decides to pump her legs in response to feeling herself slow down, involving thinking and deliberate muscle movement controlled by the fore-brain.
Direct response to environmental stimulus:
Only the child's action is a direct response to an environmental stimulus (the sensation of slowing down). The buffalo's cud-chewing is an internal digestive process, not triggered by an external environmental change.
Source: Chapter 6, Sections 6.1.1 and 6.1.2
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Explanation
- Involuntary actions are automatic, controlled by mid-brain/hind-brain (e.g., heartbeat, digestion-related movements like chewing cud).
- Voluntary actions involve conscious decision-making by the fore-brain.
- Examiners expect you to correctly name the action type, link it to the correct brain region or mechanism, and address the stimulus-response part separately.
- The key distinction for the last part: an environmental stimulus is external (slowing swing = external sensation); cud-chewing is internally driven.