{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapter 33 - For gas exchange needed in photosynthesis...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 33 (Leaf Structure and Function) Leaves Broad, flat blade Stalk-like petiole Some also have stipules Small, leaf-like outgrowths from the base Epidermis Covers upper, lower surfaces of leaf blade Waxy cuticle coats epidermis Helps plant survive dry terrestrial conditions Stomata Small pores in epidermis Permit gas exchange for photosynthesis Surrounded by two guard cells Often associated with special epidermal cells (subsidiary cells) Mesophyll Photosynthetic parenchyma cells Palisade Mesophyll Functions primarily for photosynthesis Spongy Mesophyll Functions primarily for gas exchange Leaf Veins Xylem Conducts water and essential minerals to leaf Phloem Conducts sugar produced by photosynthesis to rest of plants Monocot leaves Have parallel venation Eudicot leaves Have netted venation Adaptations for Photosynthesis 1 Most leaves have broad, flattened blade. Efficient in collecting sun’s radiant energy Stomata open during day
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: For gas exchange needed in photosynthesis Close at night to conserve water when photosynthesis is not occurring Transparent epidermis Allows light to penetrate into middle of leaf, where photosynthesis occurs Air spaces in mesophyll tissue Permit rapid diffusion of CO2 and water into (and oxygen out of) mesophyll cells, Transpiration Loss of water vapor from aerial parts of plants Occurs primarily through stomata Rate of Transpiration Affected by enviornmental factors Temperature Wind Relative humidity Effects of Trasnpiration Both beneficial and harmful to plant Trade-off between Co2 and water conservation Leaf Abscission Loss of Leaves As winter approaches in temperate climates At beginning of dry period in tropical climates with wet and dry seasons Complex process Physiological and anatomical changes occur prior to leaf fall....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern