Assertion :The process of clotting can occur in absence of all cellular elements except platelets Reason: Activated platelets release vitamin K

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Blood clotting is a nature's device to check the excessive loss of blood from an injury caused to the body. The process of clotting is initiated by platelets. The mass of aggregated platelets alone may physically plug a cut in a very small vessel.
The contact of platelets with the collagen fibres exposed by the injury causes them to disintegrate and release two substances: serotonin and thromboplastin, which minimize the loss of blood from the injury.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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