Life Cycle of a Frog
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Life Cycle of a Frog

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Life Cycle of a Frog Presentation Transcript

  • 1. Life Cycle of a Frog
  • 2. Life begins in water as eggs. Each egg has three jelly coats which enlarge with water to support it. The eggs are gathered together in a clump called a spawn.
  • 3. Between 6-10 days, the egg hatches and a tadpole wriggles out of the jelly ball. The tadpole has external gills which they breathe through.
  • 4. The tadpole begins feeding on algae and a skin fold grows over the external gill leaving a spirade for water to exit.
  • 5. Gradually the hind legs appear, followed by the forelimbs. The external gills begin to disappear, and are replaced by lungs, allowing the tadpole to breathe air.
  • 6. After the tadpole's front legs have appeared it does not eat, but absorbs it's tail for food.
  • 7. The tail shortens, functional lungs are present and metamorphosis is nearly complete. The froglet (now around three and a half months old) can now eat small bugs and spends most of its time out of the water.
  • 8. The froglet stays as a juvenile frog for one to two years.
  • 9. Sexually mature frog at three years old. It is considered an adult frog once it has finished growing and has lost it's tail.
  • 10. Reproduction: clasping by the male stimulates the female to lay 500-5000 eggs. The male fertilises the eggs as they are shed, over the course of around ten minutes.
  • 11. This PowerPoint was made from the following sources: http://www.scienceclarified.com/Al- As/Amphibians.html#b http://rde.nsw.edu.au/rm/stage1_Mod ules/frogs/ life_cycle_information_.htm Image for video retrieved from: http://www.frog-life- cycle.com/graphics/frog_life_cycle.j pg