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Out of 'X' pairs of ribs in humans only ...

Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation

A

X = 12, Y = 7 True ribs are attached dorsally to vertebral coloumn and ventrally to the sternum.

B

X = 12, Y = 5 True ribs are attached dorsally to vertebral column and sternum on the two ends

C

X = 24, Y=7 True ribs are dorsally attached to vertebral column but are free on ventral side.

D

X = 24, Y = 12 True ribs are dorsally attached to vertebral column but are free on ventral side.

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The correct Answer is:
A
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Knowledge Check

  • The given figure shows lac operon and its functioning. Select the option which correctly labels A, B, X, Y and Z

    A
    `{:(A,B,X,Y,Z),("Repressor","Inducer",beta-"galactosidase","Permease","Transacetylase"):}`
    B
    `{:(A,B,X,Y,Z),("Repressor","Inducer","Permease",beta-"galactosidase","Transacetylase"):}`
    C
    `{:(A,B,X,Y,Z),("Inducer","Repressor",beta-"galactosidase","Permease","Transacetylase"):}`
    D
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  • Assertion: First seven pairs of ribs are called true ribs. Reason: These ribs are not connected ventrally to the sternum.

    A
    If both assertion and reason are ture and reason is the corect explanation of assertion
    B
    If both assertion and reason are ture but reson is not the correct explanation of assertion
    C
    If assertion is true reason is false
    D
    If both assertion and reason are false
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