O-LevelBiologyGenetics & Variation5090/12 · May/June 2015 · Q381 Mark
Over time, a species of bird develops a more pointed beak. The more pointed shape of the beak helps the birds to catch small insects that may be hiding in cracks in the rocks. What is a reason for the change in the shape of the birds' beaks?
ABirds develop more pointed beaks as they search for insects in cracks in the rocks.
BIndividuals with less pointed beaks are better fitted to their environment and more likely to survive.
CIndividuals with more pointed beaks are better able to compete for food.
DWhen reproducing, birds are more likely to seek out mates with less pointed beaks because these are better adapted.
✓ Correct answer
C: Individuals with more pointed beaks are better able to compete for food.
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