Life Cycle of a Frog
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Transcript of Life Cycle of a Frog
Navigation InstructionsIntro Outline Vocabulary Cycle Stages Dissecting Review
The panel above this writing will navigate you through each slide and back to home.
The top panels at the top of the page will navigate you to the beginning of each section.
Objectives
• Students will be introduced to the life cycle stages of a frog by setting up a frog habitat with tadpoles collected from a local pond and by completing daily observations of this habitat. A video and reading comprehension exercises will further reinforce students’ knowledge.
Intro Outline Vocabulary Cycle Stages Dissecting Review
Outline
Vocabulary
Cycle Stages
Frog dissection
Review
Intro Outline Vocabulary Cycle Stages Dissecting Review
Vocabulary
Intro Outline Vocabulary Cycle Stages Dissecting Review
Frog Vocabulary Egg- Adult frogs mate and lay eggs. Spawn (egg-mass) - Clumps of frog eggs. Tadpole (a baby frog)- An egg hatches into a tadpole. Froglet - A young frog. Metamorphosis - The process of changing from a tadpole into an adult frog.
Cycle StagesLife Cycle of a Frog: First Week
• A female frog lays 5,000 to 6,000 eggs in water.
• Each egg is only 1.5 mm in diameter.
• When the eggs are 6 days old you can see the tiny tadpoles inside of the eggs.
Intro Outline Vocabulary Cycle Stages Dissecting Review
Life Cycle of a Frog: 6-9 Days Old
• The tadpoles come out of their eggs.
• They are now 8 mm long.• They are adapted to living
in water.• They take in oxygen from
the water through their gills.
• They have long tails to help them move through the water to hunt for food.
Intro Outline Vocabulary Cycle Stages Dissecting Review
Life Cycle of a Frog: 60-84 Days Old
• The tadpole now has back legs. It uses it’s legs and tail to move around in the water.
• Its legs will help it move around on land.
• It begins looking more like a frog.
• The last thing to disappear is the tadpole’s tail.
• It gets smaller and smaller until it is gone.
Intro Outline Vocabulary Cycle Stages Dissecting Review
Life Cycle of a Frog: Adult Frog
• An adult frog doesn’t look anything like its old tadpole self.
• Adult frogs breathe air through lungs-not gills.
• They spend most of their time on land-not in water.
• They can jump on land and swim in water.
Intro Outline Vocabulary Cycle Stages Dissecting Review
Materials
Intro Outline Vocabulary Cycle Stages Dissecting Review
Things You'll NeedSafety goggles
GlovesApron
ForcepsPreserved frogDissecting pinsDissecting trayPaper towels
ScissorsDissecting needle
Frog anatomy diagram
Intro Outline Vocabulary Cycle Stages Dissecting Review
Instructions
1Put on your goggles, gloves and apron.2Place the frog in a tray, on its back, and pin down its legs.3Cut the hinges of the frog's mouth and open it wide.4Use your probe and diagram to locate any necessary structures
inside the mouth.5Using your frog anatomy diagram, look for the frog's cloaca -- or
large intestine -- between its hind legs, and use forceps to the lift the skin in the area.
6Using scissors, cut along the center of the body from the large intestine to the lips.
7Pull back the skin and pin it flat. If you need to, cut toward the side at each leg to make this easier.
8Cut through the muscles and breast bone to open the body cavity.9Using your probe and scissors, remove the intestines and liver. Use
your frog anatomy diagram to help you locate these organs.10Consulting your diagram, remove the connective tissue on top of
the red kidneys, the peritoneal membrane.11Remove the red kidneys.12Slice open a thigh and observe the leg muscles.13Dispose of your materials according to your teacher's
instructions.
image from: http://www.spc.cc.tx.us/biology/jmckinney/Studyimages/frog/frogdissectlist.html
MuscularBack of throatPulls food into digestive system
Intro Outline Vocabulary Cycle Stages Dissecting Review
image from: http://www.spc.cc.tx.us/biology/jmckinney/Studyimages/frog/frogdissectlist.html
Connect earsto back of throat
Intro Outline Vocabulary Cycle Stages Dissecting Review
image from: http://www.spc.cc.tx.us/biology/jmckinney/Studyimages/frog/frogdissectlist.html
GLOTTISOpening torespiratory
Intro Outline Vocabulary Cycle Stages Dissecting Review
BREATHING WITH LUNGS is called
PULMONARY RESPIRATION
Intro Outline Vocabulary Cycle Stages Dissecting Review
Vocabulary Review
Intro Outline Vocabulary Cycle Stages Dissecting Review
Frog Vocabulary Egg- Adult frogs mate and lay eggs. Spawn (egg-mass) - Clumps of frog eggs. Tadpole (a baby frog)- An egg hatches into a tadpole. Froglet - A young frog. Metamorphosis - The process of changing from a tadpole into an adult frog.
Frog Quiz
http://www.softschools.com/quizzes/biology/frogs/quiz251.html
Please click on the above link to take the quiz.
Intro Outline Vocabulary Cycle Stages Dissecting Review
Dissection Review
http://www.surgery-games.org/dissect-a-frog-2/
Please click on the above link to take the quiz.
Intro Outline Vocabulary Cycle Stages Dissecting Review
Resources
• http://www.ehow.com/how_2044019_dissect-a-frog.html
• Edu.glogster.com
• http://video.nationalgeographic.com/video/animals/amphibians-animals/frogs-and-toads/frog_greentree_lifecycle/
• http://allaboutfrogs.org/info/tadpoles/index.html
• http://www.frog-life-cycle.com/
• http://www.ehow.com/how_2044019_dissect-a-frog.html
Intro Outline Vocabulary Cycle Stages Dissecting Review