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LO: SWBAT explain how plants are adapted to carry out photosynthesis
DN: Write the equation for photosynthesis. Identify the raw materials and end products.
HW: Read pages 595-598
page 606#14-20
Thursday: page 218 #29-33
Friday: Castle Learning- Holiday Review
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How are we adapted for Heterotrophic nutrition?
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The many parts of a plant help it to maintain homeostasis!!!!!
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RootsUsed to anchor the plantAbsorb waterStores nutrientsAbsorption of water and nutrientsRoot hairs
Increase surface area for water absorption
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Stems
Provides supportTransports materials from the
roots to the upper part of the plant by vascular tissue
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XylemTransports water from the roots to the leaves (up)
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PhloemTransports glucose (food) from the leaves to the roots (down)
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Transpiration
The evaporation of water from the leaves
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Where does photosynthesis happen?
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LEAVESWhere most photosynthesis occursStomata: openings in the leaf that
allow for gas exchangeCO2, O2, H2O
Cuticle: waxy covering on leaves to prevent water lossMoist environment: thin cuticleDry environment: thick cuticle
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Where in the leaf does photosynthesis happen?
PalisadePhotosynthetic cells
Absorb light
Spongy layerPhotosynthetic cellsAllow gas passage
CuticleKeeps moisture
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How do H2O and nutrients get into the leaf?
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StomataControls the rate of
gas exchange through the leaves
Found mostly on the underside of the leaf
Guard cells surround the stomatal opening
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Guard Cells
Surround the stomata
Two bean shaped cells
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What happens to the guard cells when:
In an environment of excessive water?Open to release
excess water
In a dry environment?Closed to prevent
water loss
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How do guard cells control the rate of transpiration?
Open when photosyntesis is occurring
Closed when photosynthesis is not occurring (to prevent water loss)
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In some land plants, guard cells are found only on the lower surfaces of the leaves. In some water plants, guard cells are found only on the upper surfaces of the leaves. Explain how guard cells in both land and water plants help maintain homeostasis. In your answer, be sure to:
•Identify one function regulated by the guard cells in leaves•Explain how guard cells carry out this function.•Give one possible evolutionary advantage of the position of the guard cells on the leaves of land plants.
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•Gas exchange, photosynthesis, respiration
•They change the size of the leaf opening
•Prevents excess evaporation of water from the leaves, keeps out pollutants