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


  • 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


  • 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.



Function of guard cells
Function of Guard Cells stems; transport system

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 stems; transport system

Section 23-4

Guard cells

Guard cells

Inner cell wall

Inner cell wall

Stoma

Stoma Open

Stoma Closed


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