ZoologyThe bones in different regions of the upper limb are comparable to those of the lower limb. The upper limb has ‘X’ carpals but the lower limb has ‘Y’ tarsals. Yet, the total number of bones in each upper limb or each lower limb is 30. Select the option that correctly represents the values of ‘X’ and ‘Y’ and provides the correct explanation.1.X=7Y=8The upper arm has two bones while the thigh has a single bone2.X=8Y=7There is no bone in the upper limb that corresponds to the tibia of the lower limb3.X=7Y=8The thumb has three phalanges while the big toe has only two phalanges.4.X=8Y=7The lower limb has patella and there is no bone corresponding to it in the upper limb.

The bones in different regions of the upper limb are comparable to those of the lower limb. The upper limb has ‘X’ carpals but the lower limb has ‘Y’ tarsals. Yet, the total number of bones in each upper limb or each lower limb is 30. Select the option that correctly represents the values of ‘X’ and ‘Y’ and provides the correct explanation.

1.X=7Y=8The upper arm has two bones while the thigh has a single bone
2.X=8Y=7There is no bone in the upper limb that corresponds to the tibia of the lower limb
3.X=7Y=8The thumb has three phalanges while the big toe has only two phalanges.
4.X=8Y=7The lower limb has patella and there is no bone corresponding to it in the upper limb.

  1. A

    1

  2. B

    2

  3. C

    3

  4. D

    4

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    Solution:

    The upper limb has 8 carpals while the lower limb has 7 tarsals. The lower limb has patella and there is no bone corresponding to it in the upper limb. Hence, the total number of bones in the upper limb is equal to that in the lower limb.

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