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"Explanation" fira dan eza


Tugas ini di buat untuk nilai praktek kelas 12 semester 1

Tugas ini di buat untuk nilai praktek kelas 12 semester 1

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  • 2. Metamorphosis Picture of MetamorphosisExplain of Metamorphosis CompleteExplain of Metamorphosis in Complete
  • 3. explanation Metamorphosis Metamorphosis starts with a larva or a nymph, then passes through a pupa, and ends as an adult. => (general statement). There are two main types of metamorphosis in insects, complete and incomplete. In incomplete metamorphosis, the development of larva often proceeds in repeated stages of growth. These stages are called instars. The juvenile forms closely resemble adults, but are smaller. The adult has wings, but juveniles lack of wings. => (explanation). The complete metamorphosis. Here the larvae differ markedly from the adults. The first stage is a larval stage, then enter an inactive state called pupa, and finally emerge as adults. Inside the pupa, the insect will excrete digestive juices. This destroys much of the larva’s body, leaving a few cells intact. The remaining cells will begin the growth of the adult, using the nutrients from the broken down larva. => (explanation).
  • 4. Explanation EXPLAIN OF METAMORPHOSIS COMPLETE In order for a tiny, newly hatched caterpillar to grow into a brilliant moth orbutterfly, it must first become fat very fat. In fact, the caterpillar seems to haveonly two preoccupations in life: eating and moulting. Although mammals, fish, birds, and reptiles have skeletons that support theirbody, arthropods including insects do not. Instead, God designed them with a hardskin or shell called an exoskeleton. A caterpillar’s exoskeleton may seem soft, but itgives the caterpillar its entire shape (which sometimes includes fleshy spikes orhorns). Yet it remains flexible enough to allow for gymnastic stretches toward highleaves. Further, the exoskeleton doesn’t grow; a larger exoskeleton forms foldedbeneath the smaller one. When the time is right, the tight, old skin splits open and the caterpillarwriggles carefully out, ready to try out its new exterior. After each moult, thecaterpillar is bigger and may be a slightly different shape or colour.
  • 5. explanation Picture of Metamorphosis
  • 6. Explanation Meanwhile, deep within the caterpillar’s body are clusters of cells imaginaldiscs. These are positioned to grow into wings, jointed legs, and compound eyes.After the caterpillar has moulted into its largest body size, it prepares to becomea pupa by spinning a cocoon, burrowing underground, or in the case of mostbutterflies, forming a chrysalis. As it lies there very still, hormones from within the caterpillar’s brain signalthe body to develop into the adult stage. These cause the imaginal discs to burstinto action, forming antennae, scaled wings, reproductive organs, and every otherbody part needed by the adult. Even the muscular system must be reorganized to accommodate the wings.Some muscles are destroyed, some are ‘reconstructed,’ and others are formedbrand new. When the adult moth or butterfly emerges, it looks nothing like thesquirmy worm it once was.
  • 7. explanationEXPLAIN OF METAMORPHOSIS IN COMPLETE The type of metamorphosis described above, which insects likemoths, butterflies, bees, flies and ants undergo, is known as ‘complete’metamorphosis and involves four stages: Egg Larva Pupa Adult
  • 8. explanation In the case of a moth, the caterpillar is the larva, the cocoon is thepupa, and the colorful winged creature you might catch in a net is the adult. However, a second type of metamorphosis is used by insects such astermites, grasshoppers, crickets, cicadas and aphids. This involves changing fromegg (1) to nymph (2) to adult (3) only three stages. Egg Nymph Adult
  • 9. explanation This ‘incomplete’ metamorphosis does not involve a pupa. The nymphsimply looks like a miniature adult, and as it moults it grows progressivelylarger, until it reaches its adult form with fully developed wings andreproductive organs. Darwinists face colossal problems when they attempt to explain theorigin of metamorphosis in terms of random mutation and natural selection Each stage in the insect’s life is crucial. Darwinists face colossalproblems when they attempt to explain the origin of metamorphosis in termsof random mutation and natural selection, because any gap or error in thecycle normally kills the insect or prevents reproduction. If a caterpillar can’tsqueeze out of its old exoskeleton, if it isn’t able to form a cocoon orchrysalis, or if it fails to rearrange muscles and grow body parts as a pupa, itdies. It never becomes an adult, and therefore it does not reproduce it self.