allerySmall, colourless blood cells without a nucleus that gather at an injury site to form a clot and stop blood loss are called what?
AErythrocytes
BThrombocytes
CLeucocytes
DLymphocytes
Answer & Solution
Correct answer: B. Thrombocytes
1. The cells are small, colourless, without a nucleus, and clot blood.
2. Erythrocytes carry oxygen and are red, so option A is wrong.
3. Leucocytes and lymphocytes are nucleated defence cells, ruling out options C and D.
4. The clotting platelets are thrombocytes, option B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 14 Transportation in Plants and Circulation in Animals "Blood Platelets or Thrombocytes", p.213_
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