BIOL 1202 : Exam 3 BIOL 1202
Document Summary
Covers chapters: 30, 35, 36, 37, & 38. Plant diversity ii: the evolution of seed plants. Concept 30. 1: seeds and pollen grains are key adaptions for life on land. Characteristics common to all seed plants: seeds, reduced gametophytes, heterospory, ovules, pollen. Figure 30. 2: gametophytes of seed plants develop within the walls of spores retained within tissues of the parent sporophyte, no longer dependent on water for fertilization. Ovules and production of eggs: an ovule consists of a megasporangium, megaspore, and protective integuments. Pollen and production of sperm: microspores develop into pollen grains, contain male gametophyte, pollen can be dispersed by air or animals, eliminates the need for water in fertilization. It gives rise to a pollen tube that discharges sperm into the female gametophyte within the ovule. A seed: develops from the whole ovule. Q: in seed bearing plants, microspores develop into ___. Concept 30. 2: gymnosperms bear naked seeds, typically on cones.
