Figure 23 18 the internal structure of a leaf
This presentation is the property of its rightful owner.
Sponsored Links
1 / 6

Figure 23–18 The Internal Structure of a Leaf PowerPoint PPT Presentation


  • 74 Views
  • Uploaded on
  • Presentation posted in: General

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

Download Presentation

Figure 23–18 The Internal Structure of a Leaf

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


Figure 23 18 the internal structure of a leaf

  • 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


Figure 23 18 the internal structure of a leaf

  • 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.


Figure 23 18 the internal structure of a leaf

  • 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


  • Login