BIOL 371 Lecture Notes - Lecture 3: Endosperm, Megaspore, Pollen Tube
Document Summary
Embryo retained inside gametophyte exception:montropa uniflora) tissue. Cell walls (primary- all secondary: following fertilization, the embryo is retained on the female gametophyte some) All plant cells share certain features: primary cell wall surrounding plasma membrane and cell contents (cytoplasm and organelles, cellulose fibres in matrix of hemicellulose, rigid but flexible (some strength but still very flexible) Cellulose: (polymer of glucose) most abundant organic polymer and don"t enzymes to digest cellulose hard to degrade (there are some - ex. Hemicellulose: polysaccharides (simpler structure) than cellulose in the cell wall. Some plant cells have a secondary cell wall (xylem, sclerenchyma: cellulose fibres anchored with lignin, stronger and more ridged, creates a waterproof barrier. Alternation of generations in life cycle: between haploid and diploid generation during a. Haploid: gametophyte plant body that gametes. Diploid: sporophyte plant body that produces. Gametophyte: multicellular stage of the generation; goes through mitosis plants alternate single life cycle produces spores haploid.
