figure 23 18 the internal structure of a leaf
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Figure 23–18 The Internal Structure of a Leaf

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Figure 23–18 The Internal Structure of a Leaf. Cuticle. Veins. Epidermis. Palisade mesophyll. Xylem. Vein. Phloem. Spongy mesophyll. Epidermis. Stoma. Guard cells. Leaf Structures & Functions

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figure 23 18 the internal structure of a leaf
Figure 23–18 The Internal Structure of a Leaf

Cuticle

Veins

Epidermis

Palisademesophyll

Xylem

Vein

Phloem

Spongymesophyll

Epidermis

Stoma

Guardcells

slide2

Leaf Structures & Functions

  • Epidermis – layer of tough, irregularly shaped cells; covered by cuticle; form waterproof barrier that protects tissues and limits water loss through evaporation
  • Mesophyll – photosynthesis in most plants occurs here
    • Palisade mesophyll – tall columnar, cells; closely packed
    • Spongy mesophyll – loose; many air spaces that connect to exterior through stomata
slide3

Stomata – porelike openings in the underside of the leaf; allows carbon dioxide and oxygen to diffuse into and out of leaf

  • Guard cells – control the opening and closing of stomata by responding to changes in water pressure
    • Plants keep their stomata open just enough to allow photosynthesis to take place but not so much that they lose an excessive amount of water
    • In general, stomata are open during the daytime when photosynthesis is active, and closed at night.
    • May be closed during hot, dry conditions to reduce water loss.
slide4

Vein – vascular tissue connected to vascular tissue of stems; transport system

    • xylem – carries water from roots to rest of plant
    • phloem – carries nutrients and food made by photosynthesis
function of guard cells
Function of Guard Cells

Section 23-4

Guard cells

Guard cells

Inner cell wall

Inner cell wall

Stoma

Stoma Open

Stoma Closed

function of guard cells1
Function of Guard Cells

Section 23-4

Guard cells

Guard cells

Inner cell wall

Inner cell wall

Stoma

Stoma Open

Stoma Closed

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