Content Area: Science Grade Level: 4th Grade Summary: The purpose of this instructional PowerPoint isto show and explain the life cycle and different stages of afrogs life. Learning Objective: Given this instructional PowerPointPresentation, the student will engage in two interactiveactivites regarding the different stages of a frogs life with100% accuracy. Content Standard: GLE 0107.4.1 Observe and illustratethe life cycle of animals. Accomplishment: 90107.4.1 Observe, describe, and recordthe life cycle of a particular animal.
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 frontlegs, or even around the head.
While in the amplexus position, the female frog will lay singleeggs in masses. Unlike human eggs, frog eggs are fertilized bymale frog when the female frog lays the egg. This is calledspawning and is the very beginning of the frog life cycle. Some frogs leave after this point, but others stick around towatch over the little ones.http://www.youtube.com/watch?v=WCrVtItBWTY
Frogs tend to lay many eggs because there are manyhazards 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 waterMost eggs are found in calm or static waters, to prevent gettingtoo rumbled about in infancy!
Life starts right as the central yolk splits in two. It divides into four, then eight, etc.- until it looks a bitlike a raspberry inside a jello cup. The embryo starts to look more like a tadpole, gettinglonger and moving about in its egg. Usually, about 6-21 days (average!) after beingfertilized, the egg will hatch.
In the beginning 7 days or so oftadpole development, a tadpole willeat the egg yolk that is still left in itsgut. Parts of the fragile baby tadpole Gills Tail Mouth http://www.youtube.com/watch?v=m4Lpn4qiAoc• After about 7 days of tadpoledevelopment, the tadpole willbegin to swim around on itsown and eat algae from the topof the water.
About four weeks into the tadpoles life cycle itwill begin to grow teeth and skin over the gillsand will begin to become social and swim inschools like fish. After about 6 to 9 weeks, little tiny legs start tosprout. The head becomes more distinct and the bodyelongates. They will start to eat dead insects and evenplants. The arms will begin to bulge where they willeventually pop out, elbow first. After about 9 weeks, the tadpole looks more like ateeny frog with a really long tail. It is now well on its way to being almost full-grown!Tadpole with legs
From 9 to about 12 weeks, the frog metamorphosisstarts to really take shape. The tadpole will lose mostof its tail, grow a frog tongue, and start to really looklike a baby frog.
By between 12 to 16 weeks, depending on water andfood supply, the frog has completed the full growthcycle. Some frogs that live in higher altitudes or in colderplaces might take a whole winter to go through thetadpole stage.Now these frogs will start the whole processagain...finding mates and creating new frogs.
Which stage of a frogs life cycle comes first?True or False. The male frog fertilizes the eggs while the eggsare still in the female frogs body?TRUEFALSEAmplexusSpawningBaby FrogTadpole
In this instructional PowerPoint presentation, thestudent gained the knowledge and understanding ofthe life cycles of animals. This instructional PowerPoint broke down the specificsteps in a frogs life cycle to show the students thedifferent changes a frog goes through during itslifespan.