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

How are we adapted for Heterotrophic nutrition?

The many parts of a plant help it to maintain homeostasis!!!!!

RootsUsed to anchor the plantAbsorb waterStores nutrientsAbsorption of water and nutrientsRoot hairs

Increase surface area for water absorption

Stems

Provides supportTransports materials from the

roots to the upper part of the plant by vascular tissue

XylemTransports water from the roots to the leaves (up)

PhloemTransports glucose (food) from the leaves to the roots (down)

Transpiration

The evaporation of water from the leaves

Where does photosynthesis happen?

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

Where in the leaf does photosynthesis happen?

PalisadePhotosynthetic cells

Absorb light

Spongy layerPhotosynthetic cellsAllow gas passage

CuticleKeeps moisture

How do H2O and nutrients get into the leaf?

StomataControls the rate of

gas exchange through the leaves

Found mostly on the underside of the leaf

Guard cells surround the stomatal opening

Guard Cells

Surround the stomata

Two bean shaped cells

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

How do guard cells control the rate of transpiration?

Open when photosyntesis is occurring

Closed when photosynthesis is not occurring (to prevent water loss)

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.

•Gas exchange, photosynthesis, respiration

•They change the size of the leaf opening

•Prevents excess evaporation of water from the leaves, keeps out pollutants