Buttefly-life-cycle-1 - 5 The outline of the butterfly’s...

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Butterfly life cycle prolegs true legs clasper Caterpillar (larva) The large white butterfly lays its eggs on the underside of leaves, e.g. cabbage or nasturtium The eggs hatch into larvae (caterpillars) which feed on the leaf and grow rapidly, moulting the outer layer of their ‘skin’ (cuticle) as they do so so. 1 2 3 4 5 2 Just before its final moult, the caterpillar attaches itself to a wall or tree by means of its clasper and a girdle of silk 3 Rhythmic contractions split the cuticle, which is then shed. 4 The caterpillar has now become a pupa . Its organs have taken on a form which will later become a butterfly. The cuticle begins to darken and harden
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Unformatted text preview: 5 The outline of the butterfly’s external structures can now be seen in the pupa. The pupa will stay dormant over winter; then the cuticle will split and the butterfly will emerge Caterpillar’s head . The jaws are outside the mouth and move sideways, biting off chunks of leaf jaw The prolegs and claspers have a series of tiny hooks which enable the caterpillar to grip the leaf. The prolegs are not present in the butterfly. The 3 pairs of true legs persist (in a different form) in the butterfly Prolegs True legs silk girdle Pupa legs and antenna wing cuticle splitting eye © D.G. Mackean...
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