Lesson 13: Photosynthesis Life from Light and Air

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Lesson 13 PhotosynthesisLife from Light and Air
Photo light Auto self Hetero other Troph
feeding
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Plants are energy producers

• Animals are HETEROTROPHS
• Must eat get food and energy from others
• Animals are consumers (eat others)
• Plants are AUTOTROPHS
• make own food and energy
• plants are producers (make own food)

Heterotroph (consumer)
Autotroph (producer)
Heterotroph (consumer)
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How do plants make energy food?

• Plants use the energy from the SUN
• to make ATP energy
• to make sugars
• glucose, sucrose, cellulose, starch, more

sun
ATP
sugars
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• Photosynthesis
• 2 separate processes
• ENERGY building reactions
• collect sun energy
• use it to make ATP
• SUGAR building reactions
• take the ATP energy
• collect CO2 from air H2O from ground
• use all to build sugars

sun
ATP

sugars
carbon dioxide CO2
sugars C6H12O6
water H2O

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Wavelengths and Photosynthesis
Plants can only use visible light wavelengths of
the suns energy for photosynthesis
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Using light air to grow plants

• Photosynthesis
• using suns energy to make ATP
• using CO2 water to make sugar
• Starts in chloroplast
• PIGMENTS - chlorophyll
• makes a waste product
• oxygen (O2)

Virtual Lab 6 Paper Chromatography
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What do plants need?

• The factory for making energy sugars
• chloroplast
• Fuels
• sunlight ATP
• carbon dioxide
• water
• The Helpers
• enzymes

sun
ATP
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Photosynthesis
sun
Light Reactions use sun to make ATP
ENERGYbuilding reactions
ATP
ADP
ATP used immediatelyto synthesize sugars
SUGARbuilding reactions
sugar

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Chloroplasts are only in plants.
PLANT STRUCTURE
plant cell
Mitochondria are in both plants and animals.
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Sunworshipers!
Leaf absorbssunlight CO2
sun
Leaves
Chloroplastsin leaf cell
Chloroplast
Chloroplast
Chloroplasts contain Chlorophyll
makeENERG SUGAR
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CHLOROPLAST Close-Up
Thylakoids (membrane stacks) Light Reactions
make ATP from sunlight (chlorophyll pigments)
Stroma (fluid filling)Dark Reactions use the ATP
to make sugar.
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What plants do
Flash The World of Plants Photosynthesis
(Handouts, Vquiz)

• Bring In
• light
• CO2
• H2O
• Let Out
• O2
• Move Around
• sugars

leaves
shoot
roots
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Leaf Structure
vascular bundle (vein)
xylem (water)
cuticle
phloem (sugar)
epidermis
palisades layer
spongy layer
epidermis
stomate
cuticle
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Function of Leaf Structures

• Cuticle
• waxy coating reduces water loss
• Epidermis
• skin protecting leaf tissues
• Palisades layer
• high concentration of chloroplasts
• collecting suns energy
• photosynthesis
• making ATP sugars
• Spongy layer
• air spaces
• gas exchange
• CO2 in for sugar production, remove waste O2

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Stomates Guard Cells

• Function of stomates
• CO2 in
• O2 out
• H2O out
• gets to leaves for photosynthesis
• Function of guard cells
• open close stomates

guard cell
stomate
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Guard cells Homeostasis

• Homeostasis
• keeping the internal environment of the plant
  balanced
• Stomates open
• let CO2 in
• needed to make sugar
• let H2O out
• so it gets to leaves
• let O2 out
• get rid of waste product
• Stomates close
• when need to conserve H2O

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Xylem
carry water up from roots
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Phloem food-conducting cells

• carry sugars around the plant wherever they are
  needed
• new leaves
• fruit seeds
• roots

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Transpiration release of gases (inlcuding water
vapor) into the air.
H2O
O2

• CO 2 in
• O2 out
• water out
• Creates a vacuum to pull water from roots to
  leaves.

CO2
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Transpiration

• Water evaporates from the stomates in the leaves
• pulls water up from roots with capillary action
  (water molecules stick to each other and other
  surfaces)
• more water is pulled up tree from ground

QuickLab Capillary Action
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How are they connected?
Reactants of one are Products of the other!
Respiration
Photosynthesis
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Summary
Photosynthesis
plants
CO2
O2
animals, plants
Cellular Respiration
ATP