# 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 : Option 1) X = 12, Y = 7       True ribs are attached dorsally to vertebral column and ventrally to the sternum Option 2) X = 12, Y = 5       True ribs are attached dorsally to vertebral column and sternum on the two ends Option 3) X = 24, Y = 7    True ribs are dorsally attached to vertebral column but are free on ventral side Option 4) X = 24, Y = 12     True ribs are dorsally attached to vertebral column but are free on ventral side

As we learnt

True ribs -

- wherein

First seven pairs of ribs are called true ribs.

1st 7- Pairs are true ribs

3- pairs are false ribs

and 2 pairs are floating ribs

total ribs pair are (X) = 12 pairs

True (Y) = 7 pairs.

Option 1)

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

correct

Option 2)

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

incorrect

Option 3)

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

incorrect

Option 4)

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

incorrect

A

A  7n the ribs cage ,the true ribs those which are attached to the sternum in the front and vertebral column at back .these are the 7 members.although there are total 12ribs are attached to the vertebral column

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