AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Ventricles pump blood to distant organs — the right ventricle pumps blood to the lungs and the left ventricle pumps blood to the entire body. This requires much greater force and pressure. Atria only receive blood and push it into the ventricles over a short distance, needing less muscular effort. Hence, ventricles have thicker walls.
The examiner expects two linked points: (1) the function of ventricles (pumping blood over longer distances/to the whole body) requires more force, and (2) atria perform easier work (receiving blood). Always connect structure to function — this is the core biology principle being tested here. Note: this topic is from Chapter 7 (Life Processes – Transportation), not the provided passages, so the answer is based on standard NCERT content.