Transcript
Shelby Edwards
A Frogs Life
Content Area: ScienceGrade Level: 4th GradeSummary: The purpose of this instructional
PowerPoint is to show and explain the life cycle and different stages of a frogs life.
Learning Objective: Given this instructional PowerPoint Presentation, the student will engage in two interactive activites regarding the different stages of a frogs life with 100% accuracy.
Content Standard: GLE 0107.4.1 Observe and illustrate the life cycle of animals.
Accomplishment: 90107.4.1 Observe, describe, and record the life cycle of a particular animal.
Information
Male frog clasp female underneath in an embrace called amplexus. This can last several days!
http://www.youtube.com/watch?v=SkpHQDOr5AI He literally climbs on her back, reaches his arms around her “waist", either just in front of the hind legs, just behind
the front legs, or even around the head.
Mommy and Daddy Mate
While in the amplexus position, the female frog will lay single eggs in masses. Unlike human eggs, frog eggs are fertilized by male frog when the female frog lays the egg. This is called spawning and is the very beginning of the frog life cycle.
Some frogs leave after this point, but others stick around to watch over the little ones.
http://www.youtube.com/watch?v=WCrVtItBWTY
Spawn (egg mass)
Frogs tend to lay many eggs because there are many hazards between fertilization and a full grown frog.
Reasons Why Many Eggs Won’t Hatch Get eaten by other small animals and birds
Won’t become fertilized Become dried up in the sun
Get broken in the water
Most eggs are found in calm or static waters, to prevent getting too rumbled about in infancy!
Egg
Life starts right as the central yolk splits in two.
It divides into four, then eight, etc.- until it looks a bit like a raspberry inside a jello cup.
The embryo starts to look more like a tadpole, getting longer and moving about in it's egg.
Usually, about 6-21 days (average!) after being fertilized, the egg will hatch.
Egg Cont.
In the beginning 7 days or so of tadpole development, a tadpole will eat the egg yolk that is still left in its gut.
Parts of the fragile baby tadpole Gills Tail
Mouth http://www.youtube.com/
watch?v=m4Lpn4qiAoc
• After about 7 days of tadpole development, the tadpole will begin to swim around on its own and eat algae from the top of the water.
The Fragile TadpoleWhen frog eggs hatch they don’t come out as frogs right away, they have to start out as tiny fish-like creatures called tadpoles.
About four weeks into the tadpoles life cycle it will begin to grow teeth and skin over the gills and will begin to become social and swim in schools like fish.
After about 6 to 9 weeks, little tiny legs start to sprout.
The head becomes more distinct and the body elongates.
They will start to eat dead insects and even plants.
The arms will begin to bulge where they will eventually pop out, elbow first.
After about 9 weeks, the tadpole looks more like a teeny frog with a really long tail.
It is now well on it's way to being almost full-grown!
Tadpole with legs
From 9 to about 12 weeks, the frog metamorphosis starts to really take shape. The tadpole will lose most of its tail, grow a frog tongue, and start to really look like a
baby frog.
Young Frog
By between 12 to 16 weeks, depending on water and food supply, the frog has completed the full growth cycle.
Some frogs that live in higher altitudes or in colder places might take a whole winter to go through the tadpole stage.
Now these frogs will start the whole process again...finding mates and creating new frogs.
Frog
Life Cycle in Perspectivehttp://www.sheppardsoftware.com/scienceforkids/life_cycle/frog_lifecycle.htm
Which stage of a frogs life cycle comes first?
True or False. The male frog fertilizes the eggs while the eggs are still in the female frogs body?
Activity
TRUEFALSE
Amplexus
Spawning
Baby Frog
Tadpole
YOUR ONE SMART COOKIE!!!
CORRECT!!!!
YOUR TOOOOOOOO SMART!
CORRECT!!!
INCORRECT.
LETS LOOK AT THAT ONE AGAIN TOGETHER
In this instructional PowerPoint presentation, the student gained the knowledge and understanding of the life cycles of animals.
This instructional PowerPoint broke down the specific steps in a frogs life cycle to show the students the different changes a frog goes through during its lifespan.
Summary Conclusion
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