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Bone marrow is absent in the bones of...

Bone marrow is absent in the bones of

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are truw but reason is not correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
Assertion is true `""_(38)^(90)Sr` decays to `""_(39)^(90)Y` by the emission of`beta-rays`.Sr gets absorbed in bones along with calcium.
Reason is also true. `""^90Seoverset(beta)to""^(90)Y`
Strontium decays to Yitrium.This emits `beta-rays`of very high energy.Sr does not emit`gamma-rays`.The damage is by the`beta-rays`Only.
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