chapter 33&34 review

chapter 33&34 review - Lecture 17 Chapter 33,34:...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 17 – Chapter 33,34: I. Leaf Structure A. Cuticle 1. waxy layer made of cutin that reduces water loss from exterior walls of epidermal cells B. Epidermis 1. covers the upper and lower surfaces the photosynthetic ground tissue, mesophyll, is located C. Palisade Mesophyll 1. vertically stacked, columnar mesophyll cells near the upper epidermis 2. part of photosynthetic ground tissue of leaf 3. main site of photosynthesis D. Vascular Bundle/Vein Extends through the mesophyll supplies 1. Xylem a. located in upper part of vein 2. Phloem a. confined to lower part of vein 3. Bundle Sheath a. tightly packed parenchyma or sclerenchyma cells around vein b. provides additional support to prevent leaf from collapsing under its own weight 4. Bundle Sheath Extensions a. support columns that extend through the mesophyll from the upper to lower epidermis E. Spongy Mesophyll 1. loosely, irregularly arranged mesophyll cells near lower epidermis 2. part of photosynthetic ground tissue of leaf 3. allows diffusion of gases, particularly CO 2 , within leaf F. Stoma 1. minute opening for gas exchange between leaf cells and the environment 2. CO 2 diffuses into leaf through stomata 3. O 2 diffuses rapidly out of leaf through stomata G. Guard Cells 1. responsible for opening and closing stoma 2. only epidermal cells with chloroplasts H. Subsidiary Cells A. Stomatal Opening
Background image of page 1

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

View Full DocumentRight Arrow Icon
1. Blue light, which is a component of sunlight and has wavelengths of 400 nm – 500 nm, is absorbed by yellow pigments in the guard cells, activating proton pumps located in
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

chapter 33&34 review - Lecture 17 Chapter 33,34:...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online