refresher question what is a leaf’s main function? make food! photosynthesis
TRANSCRIPT
Photosynthesis
Refresher Question
What is a leaf’s main function?
Make food! PHOTOSYNTHE
SIS
Refresher Question
What plant structure do you see here:
http://www.botgard.ucla.edu/html/botanytextbooks/generalbotany/images/typesofroots/Sonchusroots.jpg
ROOT
Refresher Question
What is the green pigment that captures light called?
Chlorophyll
Refresher Question
What is the cell organelle that contains chlorophyll called?
Chloroplast
http://www.cbs.dtu.dk/staff/dave/roanoke/chloroplast.gif
Plant Video
National Geographic Video
PhotosynthesisPlants use energy from sunlight to make food
from carbon dioxide and water.
6CO2 + 6H2O Sunlight C6H12O6 + 6O2
Chlorophyll
Chlorophyll Green ColorPart of the ChloroplastsCaptures sunlight
http://my.hrw.com/apps/alchemy/editors/viewers/popup_viewer.html
Plant Puzzler
What is the energy source that drives photosynthesis?
SUN
Sugar (Glucose)C6H12O6 6 Carbon, 12 Hydrogen, 6 Oxygen
Glucose is stored energyplants use for food
Made from CO2 and H2O and Sunlight
Plant Puzzler
The kind of food produced directly from photosynthesis is __________?
Sugar = Glucose = C6H12O6
Gas Exchange in LeavesCuticle: waxy covering that protects plant
How does gas “break through” that tough barrier?
Stoma! (plural= stomata)an opening in a leaf or stem that allows gas
exchangeEach stoma has 2 Guard Cells
Guard Cells open or close stoma Closed stoma = no gas exchange Open stoma = gas exchange
Carbon Dioxide (CO2), Oxygen (O2), and Water Vapor (H2O)
http://my.hrw.com/la/eolit05/nsmedia/eolit05_image_gallery.html
Plant Puzzler
An opening in a plant that allows for gas exchange is called a __________?
What gases are transported through the stoma? Stoma
CO2, O2, H2O
Activity: “Figuring Out Photosynthesis”
1) Complete Worksheethand in during class
2) Help teacher Make Leaf
3) Pair-Up and Discuss Overhead QuestionsClass Discussion to follow
4) Read textbook pages 332-334
Question #1
Put a plant under a dark box. Is this plant undergoing photosynthesis? Why or why not?
http://www.fightingquaker.com/jaropt/table_plant.jpg
http://homepage.eircom.net/~pakform/bse_007-3.gif
Question #2Describe what you think will happen
to the life seen here (and on Earth), after a meteor blackened the sky so that no sun could shine through?
Question #3
Are the leaves you see here undergoing photosynthesis? Why or why not?
Pretend that the branch is still attached to the living tree.
Question #4
If you and a large tree were locked in an airtight compartment, with plenty of food, water, and nutrients, could you survive? Explain your answer.
Tomorrow’s Agenda
QuizInteractive Explorations: “How’s It
Growing”