BIOL 111 Lecture Notes - Lecture 5: Antheridium, Lycopodiopsida, Microphyll

• School: McGill University
• Department: Biology
• Course: BIOL 111
• Professor: Rudiger Krahe

Document Summary

Some are sure to survive and find partners. 3. no problem in maintaining physical structure and posture as water provides buoyancy. Organisms in water don"t have to support their weight. 4. water and minerals enter the plant body by simple diffusion through the body surface. 5. photosynthesis is limited by attenuation of light intensity under water: in general body size is limited. Plants living on land: water availability frequent problem, thus evolution of special organs for absorption of water and minerals through roots. So, roots well-developed: water conservation through controlled loss through regulated openings. Hence, origin of stomata: special pathways evolved for distribution of water, minerals and photosynthetic products through long-distance transport. Hence, origin of xylem and phloem tissues: gametes are protected. Female gamete is kept anchored inside a protective structure. During evolution, sporophyte become the dominant phase of life cycle. Gametes and all cells in the gametophyte are haploid.