BIOL 111 Lecture Notes - Lecture 5: Sporophyte, Microphyll, Gametophyte

• School: McGill University
• Department: Biology (Sci)
• Course: BIOL 111
• Professor: Rajinder Dhindsa

Document Summary

Biol 111 lecture 5 evolution of land plants. Necessities of plant life: optimum hydration, protection of gametes, maintenance of physical structure and posture, obtain of water and nutrients, maximum photosynthesis, maximum body size. Diploid sporophyte (starts with fertilization (gametes fuse to create diploid zygote), ends with meiosis: isogamy (isogametes) if the two gametes are similar in appearance. Hetero-gametes sperms and eggs that are different in appearance: gametes are produced by gametophyte, no meiosis involved, but the formation of gametophytes involves meiosis, reproduction in plants, algae. -gametophyitc phase is predominant, sporophytic phase is limited to only the zygote: bryophytes (non-vascular plants including liverworts, mosses) -have motile sperms and eggs, gametes meet with the presence of water. -sporophyte is matrotrophic (parasitic) on the gametophyte: pteridophytes (first plants with vascular tissues, including club-mosses, ferns) -lower pteridophytes like club-mosses have microphylls, small leaves with single central vein. -higher pteridophytes like ferns have spores contained in sporangia, groups of sporangia are called sorus.