Which of the following best explains why movement of limbs is classified as locomotory in many cases, whereas movement of leucocytes is not?
ALimb movement is always involuntary, while leucocyte movement is voluntary.
BLimb movement commonly results in movement of the whole body from one place to another, whereas leucocyte movement does not.
CLeucocytes do not show true movement because they lack muscles.
DLocomotion can occur only in vertebrates, not in cells.
Answer & Solution
Correct answer: B. Limb movement commonly results in movement of the whole body from one place to another, whereas leucocyte movement does not.
Locomotion means movement of the whole individual from one place to another. Limb movement during walking or running causes body displacement, whereas amoeboid movement of leucocytes is movement without locomotion of the organism as a whole. Option C is tempting because leucocytes lack muscles, but movement need not always be muscular. Option A is wrong because limb movement is generally voluntary. Option D is false because the distinction is based on body displacement, not taxonomic group.
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