Lab 10

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Cerritos College *

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200

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Biology

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Feb 20, 2024

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pdf

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Bio 200 Plant Anatomy Lab Objectives: • To become familiar with the different structures and tissues of plants. Addresses Lab SLO #3. • To distinguish between primary and secondary growth. • To distinguish between eudicots and monocot plants. General Questions: 1. What does the xylem transport? 2. What does the phloem transport? 3. Are tracheids and vessel elements part of the xylem or phloem? ROOTS (Types of root systems, 30.3) 1. Live material : Look at roots and root hairs of the radishes (a eudicot) that are in the wet paper towel. Stereomicroscope: Draw and label root, root hairs, & germinated seedling. Eudicot and Monocot Root slide 2. Sketch a smaller general view at 100 X of the eudicot. Then a larger (1/4) drawing at the 400X magnification to look at the vascular cylinder to label the xylem , phloem , and endodermis . 3. Sketch a general view at 100 X of the monocot. Then a larger (1/4) drawing at the 400X magnification to look at the vascular cylinder to label the xylem , phloem , and endodermis . MERISTEM (Ch 30.3) Coleus slide Coleus is a eudicot and shows the shoot apical meristem of the plant along with some young leaves. Sketch a general view at 40X and then focus at 100X to draw the apical meristem (bud at top). Realize that roots also have apical meristem at their tips. STEMS (Ch 30.2) Eudicot and Monocot Stem Slide 1. Sketch a general view at 100X of the eudicot. Then a larger (1/4) drawing at the 400X magnification to look at a closer view of the stem area. Draw a few vascular bundles . Sclerenchyma and collenchyma will be present in the vascular bundle along with the xylem and phloem (closer to the edge of the stem). 2. Sketch a general view at 100X of the monocot. Then a larger (1/4) drawing at the 400X to look at a closer view of the stem area. Draw a few vascular bundles. LEAVES (Ch 30.4) Eudicot and Monocot Leaves Slide 1. Eudicot leaves have veins in many directions. Draw the central vein and one side (at 400X) and label the various structures ( stomata , xylem, phloem, palisade and spongy parenchyma ). 2. Monocots have veins in parallel. Draw the central vein and one side (at 400X) and label the

various structures (stomata, xylem, phloem). SECONDARY GROWTH Tilia Stem slide (Figure 30.10) Draw and label (1/4 view) of the 3-year stem, use the model for help. In your drawing you need to label tracheids , vessel elements, vascular cambium/lateral meristem, phloem. Tracheids and vessel elements need to be clearly distinguishable from each other. Make sure you know the answers to the following: 1. Generally, what is the function of root hairs? 2. Be able to compare the arrangement of xylem and phloem in the vascular cylinder/ bundles between eudicots and monocots in the various structures: roots, stems, and leaves. 3. Why is vascular cambium/lateral meristem important? 4. You should be able to tell the age of a stem by looking at the number of growth rings present. 5. Know which plant groups have tracheids, vessel elements, both. 6. Apical meristem of a root. You should know that apical meristem is where all new primary growth starts and is found in shoots and roots .

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