BIOL 1002 Chapter : Chapter 21
Document Summary
Pleasure: origin of plants, the ancestors of plants (like other organisms) originated in water, benefits: Fertilization by flagellated sperm: ancestors were similar to modern green algae (below). The features of plants: rafflesia arnoldii- the corpse flower, the features of plants: Chlorophyll, but not all ps: multicellular dependent embryos. *heteromorphic alternation of genes between haploid (gametophyte) and diploid (sporophyte) *between gametophyte and sporophyte generations: heteromorphic means different forms", so the sporophyte and the gametophyte have a different overall appearance, difference between diploid and haploid. Lignin is a material that is added to the cell walls of woody plants. It increases the stiffness of the cells and allows better support for the leaves: external protection- cuticle. Cuticle is a layer of waxy material on the epidermal layer of plants that helps prevent water loss or desiccation: mechanism for gas exchange- stomata. And later using pollinators: use of seed dispersers. Plants are either: vascular tracheophytes , with conductive tissues, non-vascular- bryophytes .
