Land Plant Anatomy Evolution - PDF
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Summary
This document presents information on the evolution of land plant anatomy, focusing on key characteristics like water maintenance, gas exchange, and physical support. It also details vascular tissues and the function of xylem. Excellent for students learning about plant structures.
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How has land plant anatomy evolved? • Critical Characteristics Include: -maintenance of cell water. -gas exchange in air and not in water. -physical support so that the plant can obtain light. -the ability to acquire nutrients from soil rather than water. -the ability to reproduce on land. -the abil...
How has land plant anatomy evolved? • Critical Characteristics Include: -maintenance of cell water. -gas exchange in air and not in water. -physical support so that the plant can obtain light. -the ability to acquire nutrients from soil rather than water. -the ability to reproduce on land. -the ability to control and coordinate growth. Vascular Tissues • Conducting tissues: • Xylem (transports water and minerals) • (physical support; wood) • Phloem • Products of photosynthesis • Hormones and other organic molecules Vascular tissue (bundle) The flow of water and solutes through the vascuar tissue Phloem Xylem Vessel An Isolated Vessel Member (from macerated stem tissue) End wall perforation Plasma membrane Galacturonic acid and Pectic acid Lignin: The second most biopolymer on earth Waterresistant Barrier to disease
