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AMPHIBIANS

AMPHIBIANS. Ms. Bridgeland 5 th Grade. Objectives and Questions: . Objective : Describe amphibian characteristics and examine how adult amphibians are adapted for life on land. Question : What are the main characteristics of amphibians? . Amphibian: “Double – life?” .

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AMPHIBIANS

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  1. AMPHIBIANS Ms. Bridgeland 5th Grade

  2. Objectives and Questions: • Objective: Describe amphibian characteristics and examine how adult amphibians are adapted for life on land. • Question: What are the main characteristics of amphibians?

  3. Amphibian: “Double – life?” • They begin their lives in water and spend their adulthood on land • To reproduce, they return to water

  4. 2 Major Groups of Amphibians • Salamanders: • Frogs/Toads:

  5. How can you tell the difference between salamanders and frogs/toads? • Salamanders have a tail even when they are adults • Frog/toads lose their tails before they become adults

  6. “What are the differences between FROGS and TOADS?”

  7. Frogs Toads

  8. FROGS: • Need to live near water • Have 2 bulging eyes • Strong, long, webbed hind feet that are adapted for leaping and swimming • Strong and slimy skin (like very moist environments) • Will take long jumps • Like to lay eggs in clusters • Found on every continent except Antarctica • More than 400 species • Have a lot of PREDATORS

  9. TOADS • Can live further away from water • Lower, football-shaped eyes • Stubby bodies with short hind legs (for walking instead of hopping) • Warty and drier skin • Lay eggs in long chains • Will run or take small hops • Can be found worldwide except for Madagascar, the polar regions, and Polynesia • More than 300 species • Do NOT have a lot of predators

  10. Amphibian Reproduction • Salamanders – eggs are fertilized internally • Frogs and toads –eggs are fertilized externally • For all amphibians, Fertilized eggs develop in water • What is special about amphibian eggs is that they have a protective jelly that coats the egg

  11. Stage 1: Adult frogs lay eggs in water

  12. Stage 2: Fertilized Eggs • Fertilized eggs are laid in water for a few days

  13. How are Amphibian Eggs different from other eggs?

  14. Stage 3: Larvae • After a few days, larvae wriggle out of a jelly that coats the egg and begin a free-swimming, fishlike life • larvae of a frog or toad is called a _________

  15. As they grow, larvae undergo a ______________________?

  16. Metamorphosis • A process where an animal develops after birth or hatching, involving a sudden change in the animal’s structure

  17. Stage 4: Larvae develops hind legs

  18. Stage 5: Front legs develop but frog still has tail

  19. Stage 6: Frog loses tail and becomes a mature adult

  20. Amphibians: ADAPTATIONS • What is an adaptation? • Once amphibians are adults, what new adaptations do they need to live on land?

  21. Adaptation 1: OXYGEN • While amphibians are larvae, (exampletadpoles), how do they breathe?

  22. Once, they are on land, how do they breathe? • Amphibians must get oxygen from the AIR instead of the water once they are on land • During metamorphoses, amphibians lose their gills and develop LUNGS. • What two gases are exchanged through the lungs? • OXYGEN and CARBON DIOXIDE

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