2. Content Area: Science
Grade Level: 4th Grade
Summary: 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.
3. 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.
4. 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
5. 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!
6. 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.
7. 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.
8. 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
9. 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.
10. 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.
11.
12. 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?
TRUE
FALSE
Amplexus
Spawning
Baby Frog
Tadpole
16. 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.
