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Chapter 10

Chapter 10. Life Cycles of Some Animals. In the previous chapter, we learnt that …. Some living things look the same at each stage of the life cycle. Some living things look very different at each stage of the life cycle.

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Chapter 10

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  1. Chapter 10 Life Cycles of Some Animals

  2. In the previous chapter, we learnt that… • Some living things look the same at each stage of the life cycle. • Some living things look very different at each stage of the life cycle.

  3. When living things look the same at each stage of the life cycle, their young look like the parents.

  4. young of beetle adult beetle When living things look very different at each stage of the life cycle, their young do not look like the parents.

  5. Help Joe match the baby animals with their parents.

  6. egg adult chicken chick Life Cycle of a Chicken

  7. Notice that there are three stages in the life cycle of a chicken.

  8. Notice also that the young of the chicken looks like the adult!

  9. How does an egg become a chicken?

  10. The chick develops inside the eggshell. After 21 days, the chick pecks at the eggshell to come out.

  11. egg larva (caterpillar) adult butterfly pupa Life Cycle of a Butterfly

  12. There are four stages in the life cycle of a butterfly.

  13. Notice that the young of the butterfly do not look like the adult.

  14. Let’s look at the life cycle of a butterfly more closely.

  15. A female butterfly lays its eggs on the leaves or stem of a suitable plant. eggs Each egg hatches into a larva (caterpillar). caterpillar

  16. A caterpillar changes its skin many times as it grows. This process is called moulting. A caterpillar eats and grows to prepare itself for the next stage. larva (caterpillar)

  17. The caterpillar stops feeding. It fastens itself to a leaf or twig and spins a case around itself. pupa

  18. When the case breaks open, a beautiful butterfly flies out.

  19. egg (in egg case) adult cockroach nymph Life Cycle of a Cockroach

  20. There are three stages in the life cycle of a cockroach.

  21. The young of the cockroach looks very much like the adult.

  22. Let’s look at cockroaches now!

  23. The female cockroach lays its eggs in an egg case. Each egg case contains 16 to 50 eggs.

  24. Each egg hatches into a nymph. nymph

  25. What’s the difference between a nymph and an adult cockroach?

  26. I know! A nymph is smaller and it doesn’t have wings.

  27. Visit the following websites for more information! http://www.hhmi.org/coolscience/butterfly/ http://www.oswego.org/staff/cchamber/resources/butterflies.cfm http://www.midcoast.com.au/~ttc/Change.html http://chickscope.beckman.uiuc.edu/explore/embryology/ http://www.uen.org/utahlink/activities/view_activity.cgi?activity_id=2024

  28. egg adult chicken chick At a glance… Life Cycle of a Chicken

  29. egg larva (caterpillar) adult butterfly pupa At a glance… Life Cycle of a Butterfly

  30. egg (in egg case) adult cockroach nymph At a glance… Life Cycle of a Cockroach

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