Metamorphosis

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metamorphosis by Hina Yaseen Ranjha

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Metamorphosis

  1. 1. Metamorphosis HINA YASEEN RANJHA ROLL NO.29 M.Sc ZOOLOGY 3rd (R) UNIVERSITY OF SARGODHA PAKISTAN
  2. 2. Insects in the world  Most successful animals  Make up 2 out of three living things  Make up over 75% of all animals
  3. 3. Number of total species Insects other arthropods Other animals
  4. 4. Complete Metamorphosis
  5. 5. Incomplete Metamorphosis Egg- nymph- adult *Three stages of development At each stage the insect looks much the same as it does when it becomes an adult. Examples: Grasshopper or cockroaches
  6. 6. Insect Development or Metamorphosis  Two forms of development (change) 1. Incomplete Complete 2.
  7. 7. Metamorphosis  Metamorphosis – The changes in the shape or characteristics of an organism’s body as it grows and matures.  Some animals, especially insects, have one kind of body when they are young and a very different kind of body when they are adults.
  8. 8. Insect -characters  Wings  Only birds, bats and insects  Only found in adult insects Not all insects have wings (fleas,springtails ) 
  9. 9. Insect -characters  One pair of antennae May be small <antennae
  10. 10. Insect -characters  Three sets of legs Easiest character to see
  11. 11. Insect -characters  Body divided into three regions
  12. 12. What is an insect?
  13. 13. Arthropods= Insects and their relatives Do not have a backbone(invertebrates) Jointed legged animals include; Ticks, mites ,spiders ,millipedes Centipedes, and insects
  14. 14. What is metamorphosis?  Metamorphosis refers to the way that certain organisms develop, grow, and change form.  Metamorphosis "change". actually means
  15. 15. Two Types of Metamorphosis  INCOMPLETE METAMORPHOSIS - has THREE stages  COMPLETE METAMORPHOSIS has FOUR stages.
  16. 16. INCOMPLETE METAMORPHOSIS Let’s take a closer look at each stage!
  17. 17. 3 STAGES OF INCOMPLETE METAMORPHOSIS  Egg  Nymph  Adult
  18. 18. EGG A female insect lays eggs. These eggs are often covered by an egg case which protects the eggs and holds them together.
  19. 19. NYMPH      The eggs hatch into nymphs. Nymphs looks like small adults, but usually don't have wings. Insect nymphs eat the same food that the adult insect eats. Nymphs shed or molt their exoskeletons (outer casings made up of a hard substance called chitin) and replace them with larger ones several times as they grow. Most nymphs molt 4-8 times.
  20. 20.  ADULT  The insects stop molting when they reach their adult size. By this time, they have also grown wings.
  21. 21. COMPLETE METAMORPHOSIS Let’s take a closer look at each stage!
  22. 22. 4 STAGES OF COMPLETE METAMORPHOSIS  Egg  Larva  Pupa  Adult
  23. 23. EGG  The female lays eggs.
  24. 24. LARVA Larva hatch from the eggs. They do not look like adult insects. They usually have a worm-like shape.  Caterpillars, maggots, and grubs are all just the larval stages of insects. Larvae molt their skin several times and they grow slightly larger. 
  25. 25. PUPA     Larva make cocoons around themselves. Larva don't eat while they're inside their cocoons. Their bodies develop into an adult shape with wings, legs, internal organs, etc. This change takes anywhere from 4 days to many months.
  26. 26. ADULT  Inside the cocoon, the larvae change into adults. After a period of time, the adult breaks out of the cocoon.
  27. 27. WHAT ABOUT FROGS?     Frogs undergo a different type of COMPLETE METAMORPHOSIS. From the egg emerges a tadpole, which lives in the water, breathes with gills, and has a tail. As the tadpole grows, lungs and legs form, and the gills and tail are absorbed into the body. Finally, the animal leaves the water and lives mainly on land, as a frog.

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