AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Platelet cells help in clotting the blood at points of injury. They circulate in the blood and plug leaks in blood vessels, preventing excessive blood loss and maintaining pressure in the circulatory system.
Source: Life Processes, Section 5.4.1 – Maintenance by platelets
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The examiner expects the key function: blood clotting / plugging leaks at injury sites. The textbook phrase "plug these leaks by helping to clot the blood at these points of injury" is the core idea. Mentioning prevention of blood loss and maintenance of pressure adds completeness for a 1-mark answer but the single essential point is clotting/plugging leaks.