DOC PREVIEW
VCU BIOL 152 - plant structure/function

This preview shows page 1 out of 2 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

BIOl 152 1st Edition Lecture 12Outline of Last Lecture I. Important Eukaryotic cladesII. Multi-cellularityIII. Cell communication and differentiationOutline of Current Lecture I. Plant tissueII. Leaf functionIII. StomataIV. Vascular tissueV. Substance TransportVI. Transfer of Xylem SapVII. Sugar Transport systemCurrent LectureI. Plant tissuePlants consist of three main tissues, the dermal tissue, the ground tissue, and the vascular tissue. The dermal tissue is composed of the epidermis in leaves and periderm in the stem and roots, and provides protection for the plant. The ground tissue is composed of parenchyma, which synthesizes and stores carbohydrates; the main function of the ground tissue is to providethe plant with support. The vascular tissue is composed of a xylem and phloem, and transports nutrients and water throughout the plant.II. Leaf FunctionThe main function of leaves is to photosynthesize carbon dioxide and water to produce oxygen and glucose into the atmosphere.III. StomataStomata are channels that allow for the diffusion of carbon dioxide. If the guard cells uptake solute, water is drawn in and stomata open. If the guard cell releases solute, water flows out and stomata close.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.IV. Vascular TissueVascular Tissue is composed of two mechanisms, the xylem and the phloem. The xylem is composed of vessel elements and functions to transport water throughout the plant. The phloem contains sieve elements and companion cells that help the phloem transport carbohydrates throughout the cell.V. Substance TransportDiffusion plays an important role in transport of minerals and water across short distances throughout the plant. Bulk flow moves fluid in response to a pressure gradient, and is more effective across large distances.VI. Transport of Xylem SapXylem transports water throughout the plant, it does so by two mechanisms, the root pressure and the cohesion-tension mechanism. The root pressure is most efficient in short distances and occurs when solutes are transported because of a positive pressure pushing the solutes upward. The cohesion-tension mechanism occurs when transpiration, the evaporation of water causes a pull (negative pressure) and the cohesion between water molecules, and adhesions between the water molecules and the walls of the xylem overcome the downward force of gravity.VII. Sugar Transport MechanismA proton pump acts as a form of active transport that allows for the transport of sugars throughout the plant and also allows for the recycling of water, through


View Full Document
Download plant structure/function
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view plant structure/function and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view plant structure/function 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?