BIOL 2200 Lecture Notes - Lecture 16: Meiosis, Flowering Plant, Motility
24 Feb 2017
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Document Summary
Decomposers = break down cellulose and lignin. Releases carbon and other minerals back into the environment. Commensal no effect on any plant. Endophytes produce toxins that protect the plant from herbivores. Ants feed fungi leaves, and then the ants eat some of the fungi. Rust, smut, blight, wilt different fungal parasites. General overlap between plants and all algae: Phragmoplast = unique structure of cell division. Leaves have waxy cuticles to prevent water loss. Have stomata (pores) to help with gas exchange. Desiccation-resistant spores that do not shrivel up and die. Gametangia (male/female) are structures that produce gametes. 1) gametophyte = haploid multicellular life stage. 2) gametophyte undergoes mitosis to produce two haploid cells. 3) gamete from another plant fuses and fertilization occurs. 4) diploid zygote forms and undergoes cell division. 6) sporophyte undergoes meiosis and releases haploid spore. Unlike animals, plant gametes are formed by mitosis. 90% of which are angiosperms (flowering plants)
