BIOL 1541L Chapter Notes - Chapter 30: Pinophyta, Pollen Tube, Stamen
6 Apr 2017
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Occur at the region of the nodes, between the cells of the main axis. Male and female reproductive structures grow at the nodes. Coleochaete grows on at aquatic surfaces such as rocks in streams. Key feature in the evolution of plants was the protection of the zygote. Land plants also protect and nourish the resulting embryo. Megaphylls: large leaves that increase the surface area for photosynthesis. Gymnosperms were the rst plants with seeds. Seeds contain the embryo and supportive nutrients within a protective coat. All plants have a life cycle that includes this. 2 multicellular individual"s alternate, each producing the other. The 2 individuals are a sporophyte, which represents the diploid (2n) generation. And a gametophyte, which represents the haploid (n) generation. Sporophyte: the structure that produces spores by meiosis. Haploid reproductive cell that develops into a new organism without needed to fuse with another cell. In plant life cycle, a spore undergoes mitosis and becomes a gametophyte.
