Brenda Rone, Susan Gentry, and Bridgett NiedringhausHazelwood School District

Second Grade

These lessons are designed to reinforce:State Science Standard 3

VII Living Systems

A. Structure, Function, and CharacteristicsB. Life ProcessesC. DiversityD. ReproductionE. Adaptation and Evolution

Teacher Page

•Second Grade, Show Me Standard, Science 3

•The elements of Living Systems are integrated in the activities.

•We suggest that students keep a journal.

•It is critical for students to use writing skills to explain answers. When you see this symbol students should use their journals.

•Please take time to discuss possible answers.

Click to go to next screen.

Life CycleActivity 1

Write one sentence for each picture, describing the changein eachstage.

Life Cycle of a Frog

1

2

34

5

Use words from the

list to help youwith your

writing.

legsadulteggtadpoletaillungsgillsfrog

Answers next...

1

2

34

5

The life of a frog begins when the tadpole hatches from the egg.

Stage 1

Stage 2

1

2

34

5

Stage 2

Stage 3

A tadpole has gills and swims in the water. Legs begin to develop.

1

2

34

5

Stage 3

Stage 4

After a period of time the tadpole has fully developed legs and lungs.

1

2

34

5

Stage 4

Stage 5

The tail is being absorbed and the frog is able to spend more time on land.

1

2

34

5

Stage 5 The frog is fully developed and can live on land or in water.

End of Activity