Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 44, Problem 4MC
Summary Introduction

Introduction:

The process of absorbing water through root hairs by the means of capillary action and transpiration pull is water absorption. The water from the roots moves from the various cells until it reaches vascular tissues, from where the water moves to leaves (photosynthetic center).

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Minerals dissolved in watera. enter root epidermal cells by active transport.b. take an extracellular pathway through roots to thevascular cylinders.c. are transported up through phloem to the leaves.d. enter root cortex cells by diffusion.
After sucrose enters sieve tubes,a. it is removed by the source.b. water follows passively by osmosis.c. it is driven by active transport to the source, which is usuallythe roots.d. stomata open so that water flows to the leaves.e. All of these are correct.
(b) Water absorbed by plant roots travels by different pathways from the root hairs to the xylem. Figure 5 shows these pathways in a plant root. cell A xylem vessel root hair key pathway B Tissue D Tissue E * pathway C Figure 5: Schematic representation of water movement through the tissues of a plant root (PLEASE TURN OVER) Page 6 CONT'D from Page 5 i. Explain how water moves from the root hair to the xylem vessels in the root. ii. Identify cellA, pathway B, pathway C, tissue D and tissue E in Figure 5.

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