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Life Cycles-Stages of Life

Life Cycles-Stages of Life. Life Cycles of Organisms. Direct Development. Many organisms change as they grow. But some do not change their appearance drastically. They keep their same body shape but it may grow larger or wider.

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Life Cycles-Stages of Life

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  1. Life Cycles-Stages of Life Life Cycles of Organisms

  2. Direct Development • Many organisms change as they grow. But some do not change their appearance drastically. They keep their same body shape but it may grow larger or wider. • This kind of growth development is called direct development. It is called that because the growth is linear or direct.

  3. Incomplete Metamorphosis • Some animals, especially insects, have one kind of body when they are born and then another when they are an adult. • The changes that occur during this development of growth is called metamorphosis. • Some insects go through incomplete metamorphosis.

  4. Incomplete metamorphosis is when an insect goes through 3 stages of development. • Stage 1- egg • Stage 2- nymph • Stage 3- adult • Draw each stage, p. A73.

  5. Complete Metamorphosis • Animals whose bodies take on multiple changes or change drastically are said to go through complete metamorphosis. • A beetle is an example of an animal who goes through complete metamorphosis. • Complete metamorphosis has 4 stages. They are egg, larva, pupa, and adult.

  6. During the first stage, the insect develops inside an egg. When it hatches from the egg, it is now beginning the next stage. • Now it is called a larva. A larva does NOT have wings and looks VERY different from its adult form. • During the third stage of complete metamorphosis, the insect can not move or eat. This is when it is in the pupa stage. Most of the time, they are in a cocoon or chrysalis.

  7. The fourth stage is when the insect emerges from the cocoon, and it is now in its adult shape and size.

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