152-Disc_Gilroy3_Assign-2024sp

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School

University of Wisconsin, Madison *

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152

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Biology

Date

Apr 3, 2024

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docx

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4

Uploaded by DeaconDinosaur4111

Intro Bio 152 – Discussion assignment for week of February 12 th In class, we learned about the three main tissue systems in plants: dermal, vascular, and ground. The dermal tissue system is the outermost layer of the plant that protects the plant and serves as an interface between the plant and the environment, the vascular tissue system moves liquids through the plant, and the ground tissue system is everything else. This homework will focus on the vascular and ground tissues. 1. Circle or highlight the correct answer below. An isolated plant cell can be cultured in a Petri dish and made to divide and produce a completely new plant. This is possible because some plant cells are in a permanently embryo-like state (i.e., can divide into any cell type in the plant), while others are capable of changing the patterns of gene expression in their nucleus from those of their current cell type (such as root cell, or leaf cell) back to this embryo-like state. Cells with an embryonic-like nature can divide to produce any of the structures of the plant and so are capable of dividing to make a complete new plant. All of the following cells would be able to regenerate an entire new plant EXCEPT for a/an: A. apical meristem cell B. parenchyma cell C. collenchyma cell D. sieve tube cell E. axillary meristem cell 2. For question #1, immediately above, why did you choose your answer? You don’t have to write about every option; just explain why you think the answer you chose is the correct one. Be specific in your answer – you can do so in 2-3 sentences. Sieve tube cells are part of phloem tissues which is responsible for moving food and sugars throughout the plant. Because of this, cells lose their nucleus when matured thus, unable to regenerate an entire new plant. 3. There are two main types of vascular tissue. Draw a picture of each tissue type below and complete the accompanying chart beneath. Be sure to label your drawings. For tissues with more than one type of structure, choose one example to draw, and be sure to tell us which you chose. Tissue Type 1: Page 1 of 4
What moves through this tissue type? Water and minerals move through the xylem tracheid. Direction of flow Water and minerals flow upward. Alive or dead at functional maturity? Dead at maturity so cannot preform photosynthesis. Types/components Xylem consists of tracheids, vessels, parenchyma, and fibers. Tissue Type 2: What moves through this tissue type? Food is moved through the phloem. Direction of flow Up or down, wherever through the plant. Alive or dead at functional maturity? It is alive since the phloem is required to carry food through the plant. Types/components Primary and secondary phloem. 4. Provide an example of each type of ground tissue that Dr. Gilroy did NOT use in lecture. You should use a search engine or other outside resource to find your example. Parenchyma: aerenchyma: spongy tissue that forms air channels in the roots and stems Collenchyma: lacunar collenchyma: found in the petioles of plants like Salvia. Page 2 of 4
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