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Week Two Lecture Summary

by: Kiana Encinas

Week Two Lecture Summary Bot 105

Marketplace > Humboldt State University > Botany > Bot 105 > Week Two Lecture Summary
Kiana Encinas
General Botany
Frank Shaughnessy

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About this Document

This week we went over form and function of leaves and roots. There is also a small section covering what key skills we should have picked up from the lab on Thursday.
General Botany
Frank Shaughnessy
Class Notes
roots, stem, shoot, vascular bundle, leaves, leaf, botany
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This 2 page Class Notes was uploaded by Kiana Encinas on Saturday September 5, 2015. The Class Notes belongs to Bot 105 at Humboldt State University taught by Frank Shaughnessy in Summer 2015. Since its upload, it has received 61 views. For similar materials see General Botany in Botany at Humboldt State University.

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Date Created: 09/05/15
Botany Week Two in a nutshell 83192 and 94 Lectures Leaf function characteristics and tissues Main Function receives light and C02 for photosynthesis High surface area to volume ratio Parenchyma cell The most abundant cell in a plant vary in size and shape and usually thinwalled Mesophyll layer between the layers of the epidermis where the mesophyll cells are located mesophyll cells usually contain chloroplast Epidermis a leaf s outermost layer of cells Chlorenchyma Parenchyma cells that contain chloroplasts Xylem Vascular tissue that is a complex tissue that is characterized by the presence of tracheary elements Most of the water and minerals of the plant are conducted by the xylem Phloem vascular tissue in plants that transfers metabolic products and sugars down from the leaves Vascular bundle Tissue that contains primary Phloem and Xylem and that is enclosed by parenchyma cells Stomastomataplurala small opening in the epidermis of leaves that allows gasses such as C02 to pass through They have the ability to open and close to prevent water loss Leaves have adapted over time to t their environment For example a desert leaf may have a more waxy surface with less stomata to stop water from escaping Stems function characteristics and tissues Supports the plant Carries water to the leaves from the roots Raises the plant vertically to expose it to sunligt Stemleaf shoot A potato is a stem A downside to being higher up is that there is more plant to send nutrients and water to and the plant is more vulnerable to weather and herbivorous omnivorous predators Root function characteristics and tissues Rootcap protects the roots apical meristem Meristem point of cell division Lateral root aka branch root rootcap and root hairs Roots take in water to send to the rest of the plant They are the attachment point or anchor Epidermal tissue is responsible for protection and uptake e Pencycle production of branch roots Passage cells pump water by osmosis from the cortex into the closest arm of the xylem Passage cells do not exist above the root hairs to ensure there is no leaking Lab Review what to know Know the difference between a simple and compound leaf Be able to identify a modi ed leaf and explain its modi ed function Be able to identify a modi ed root and explain its modi ed function Be able to identify a modi ed stem and explain its modi ed function Primary root rst root produced by the embryo Secondary root root that extends from primary root Node where the leaf is attached to the stem Axillary bud point on stem that can either develop into a shoot or a ower Location of shoot the shoot is the stem and the leaves


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