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    Question

    In blood, platelets are required

    for
    A transporting oxygen Correct Answer Incorrect Answer
    B transporting carbon dioxide Correct Answer Incorrect Answer
    C initiating blood clotting Correct Answer Incorrect Answer
    D initiating degradation of urea Correct Answer Incorrect Answer

    Solution

    Platelets (thrombocytes) are essential for initiating blood clotting. They help form a plug at the site of injury by releasing clotting factors that lead to the formation of fibrin threads. Platelets do not transport gases or degrade urea. Information Booster:      

    1. Platelets are cell fragments derived from megakaryocytes.
    2. Normal platelet count is 150,000–450,000 per microliter of blood.
    3. Platelets play a role in wound healing.
    4. Deficiency of platelets can lead to excessive bleeding (thrombocytopenia).
    5. Overproduction can cause unwanted clots (thrombosis).

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