Ch 35-39 investigation - Ch 35 Activities and...

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

View Full Document Right Arrow Icon
Ch. 35 Activities and Investigations: Activity : Root, Stem, and Leaf Sections Epidermis – t he outer layer of cells surrounding the root. Many of the epidermal cells of the root bear extensions, known as root hairs, that increase the surface area for the absorption of water and dissolved minerals from the environment. Cortex – t he parenchyma cells lying between the epidermis and the vascular tissues constitute the cortex of the root. The stems of most herbaceous dicots are composed of several different kinds of simple and complex tissues and exhibit a very characteristic structure when viewed in cross section. Epidermis – The outer layer of cells surrounding the stem. Cortex – The cells lying between the epidermis and the vascular tissues constitute the cortex of the stem. Most of the cortical cdells are parenchyma, but there may be one or more layers of collenchyma lying immediately beneath the epidermis. Pith – The central portion of the stem is filled with parenchyma cells that have very distinct intercellular spaces; this region is collectively known as the pith. Vascular Bundles – Separating the pith from the cortex is a ring-shaped arrangement of structures known as vascular bundles. Each bundle represents a longitudinal strand running the length of the stem and containing two different kinds of complex tissues, the vascular, which are responsible for the transport of materials throughout the plant body. Xylem – A complex tissue composed of parenchyma cells, sclerenchyma fibers, and two kinds of specialized water-transport cells, tracheids and vessel elements. Phloem – A complex tissue composed of parenchyma cells, sclerenchyma fibers, sieve tube members, and companion cells; this tissue type is specialized for the transport of dissolved organic materials throughout the plant.
Image of page 1

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

View Full Document Right Arrow Icon
The basic structure of herbaceous monocot stems is very similar to that of herbaceous dicot stems. In cross section, you should be able to identify the epidermis, supporting layers of collenchyma tissue, the ground tissue composed of parenchyma cells, and the vascular bundles.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the 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