La grenouille

ScienceGrade 2Ginette BoudreauFrogsObjectivesStudents will learn about:AmphibiansA frogs life cycle Metamorphosis and development of frogsCharacteristics of frogs and tadpolesThe needs of frogs and tadpoles

2Take time to explain to the students what they will be learning.

What do you know aboutfrogs?Image: Microsoft clipart3Ask the students what they know about Frogs.Listen to what they say and write key words on the whiteboard or on a large piece of paper.At the end of the presentation, you can ask the same question.Add new info with an other color of pen.Compare what we knew before and what we know now.Frogs are amphibians

image: Photo courtesy of doc1975 forums.kingsnake.com/forum.php?catid=147,Retrieved May18,20094Explain to the class whats an amphibien ( 2 lives,)The frog can live part of his life in the water and part of his life out of the water.Amphibiansare vertebrates- have backboneslive part of their lives in water and the other part on landare cold bloodedreturn to the water to lay eggs.

Other Amphibians

Monro,A. courtesy Natural History Museum, London. Retrieved May 17,2099 from news.nationalgeographic.com/.../photo3.html Caecilian Salamander Orlov, N. Retrieved May 18,2009 from www.livingunderworld.org/gymnophiona/database/What is metamorphosis?It means change in appearanceIt means transformation7Explain that metamorphosis is changeSee the link that shows the butterflys metamorphosisMatingIn SpringMales sing to attract a femaleThey often mate in the waterFemales lay many eggs in the waterMales fertilize the eggs once they are laid

Mating image:: Retrieved May 18, 2009l from the-reaction.blogspot.com/2007_03_11_archive.htm

Eggs Eggs are covered in a jelly substance Found in water Hatch in 6 to 21 days

Startosta,P. (photographe of egg). (1991). La grenouille, Belgique,ditions MilanTadpolesCome out of the egg after 21 daysLive underwater for 90 days Eat aquatic plantsBreathe with their gills

Startosta,P. (photographe of tadpole). (1991). La grenouille, Belgique,ditions MilanDuring 90 days,the tadpoles will have a veryinteresting transformation called metamorphosis Metamorphosis

Day 1Week 6Week 10Startosta,P. (photographe of life cycle). (1991). La grenouille, Belgique,ditions MilanWeek 14clickTadpole: Development stagesDays or weeks after egg hatched.Development7-9 daysMouth, tail and poor gills 4 weeksGills , tiny teeth6-9 weeksLegs are grown, long tail12 weeksSmall tail, looks like frogFrogsLive in water and on landEat insectsHave 4 legsBreathe with lungsDo not have a tailSwim and leap

Farall,D.(photographe of a frog).GettyImages. Retrieved May18,2009, from HowStuffworksFrogs mateEggsTadpoleAdult frogDid you knowWhen a frog swallows a meal, his bulgy eyeballs will close and go down into his head to push the meal down his throat!

Frogs are one of the best leapers on the planet!

Image frog eating: soleilimg1.free.fr/gifs/gifs.php3?cat=animaux&scat=grenouille&suite=yes*Gulp*

Image frog leaping: http://soleilimg1.free.fr/gifs/animaux/grenouille/greno067.gifTadpoleFrogTailGillsLungsEats insectsLives in waterLives on landUsing the SmartBoard, lets put an X to identify aspects of each:TadpoleFrogTail XGills XLungs XEats insects XLives in water X XLives on land XAnswers:Well Done!How animals changeClick on the action button to see the changes that occur to different living things. These are different life cycles Source: http://www.youtube.com/watch?v=xmsTccmRMh4&feature=relatedResources taken from:http://allaboutfrogs.org/weird/general/cycle.html (Did you know)https://portal.nbed.nb.ca/tr/cd/Documents/,DanaInfo=portal.nbed.nb.ca,SSL+You%20and%20Your%20World%20Grades%20K%20-2%20English.pdf (NBED Curriculum)http://www.youtube.com/watch?v=5GGuEr-MQf4 (video-how tadpoles change)http://www.youtube.com/watch?v=xmsTccmRMh4&feature=related (animal life cycles)

Resources for imageshttp://soleilimg1.free.fr/gifs/gifs.php3?cat=animaux&scat=grenouille&debut=60&nba=6&suite=yes (all clipart in this presentation)Pictures in the presentation (see below picture for references)