What’s in a Leaf

[Pages:13]What's in a Leaf

What's the relationship between structure and function in a leaf?

Model 1 ? Leaf Sun-Catcher

1) Sun (energy), Water (liquid), Carbon Dioxide

2) Water (gas), Oxygen, Sugars

3) Water

4) Central Vein

5) Water has changed from a liquid to a gas.

Equation for Photosynthesis

6) Using above equation:

a) Reactants? Carbon Dioxide and Water b) Reactants enter? Carbon Dioxide through stomata (underside of leaf), Water

through roots to stem (xylem) and then central vein of leaf c) Products? Sugars and Oxygen d) Products exit? Oxygen through the stomata, Sugars through the veins

7) Matter OR Energy ? Solar (light) Energy

Chemical Energy (C-C and C-H bonds)

Model 2 ? Cross Section of a Leaf

8) Layers: Cuticle Upper epidermis (skin) Palisade mesophyll (middle) Spongy mesophyll (middle) Lower epidermis (skin) Cuticle

9) Vein position

a) Model 1 - Central vein in middle with other veins branching off

b) Model 2 ? Between palisade and spongy mesophyll

Model 2 ? Cross Section of a Leaf

10) Veins: get water to all parts of the plant ... the leaf requires water to help make sugar

11) Sunlight enters Water enters (liquid) Carbon dioxide enters Sugar exits Oxygen exits

Water (gas) exits

Xylem (liquid water) Phloem (sugar)

12)Palisade mesophyll and guard cells have chloroplasts

13)Palisade and guard cells (chloroplasts conduct photosynthesis)

14)Chlorophyll (green pigment) are mostly in Palisade mesophyll

15)Light goes through cuticle and upper epidermis

16) Palisade mesophyll have lots of chloroplasts, arranged vertically, tightly packed, and larger.

17) More cells = More chloroplasts = More photosynthesis

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