BIOL 1202 : Test 3 Notes

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15 Mar 2019
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Chapter 30: plant diversity ii: the evolution of seed plants. Concept 30. 1: seeds and pollen grains are key adaptations for life on land. Characteristics common to all seed plants: seeds, reduced gametophytes, heterospory, ovules, pollen. Gametophytes of see plants develop within the walls of spores retained within tissues of the parent sporophyte. No longer dependent on water for fertilization. An ovule consists of a megasporangium, megaspore, and protective integuments. 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. Develops from the whole ovule (figure 30. 3b) In seed bearing plants, microspores develop into _____. Concept 30. 2: gymnosperms bear naked seeds, typically on cones. Phylum coniferophyta: pines, firs, junipers, sequoias. A closer look at the life cycle of a gymnosperm.

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