22-1 What is a Plant? p634

Characteristics of Plants Kingdom Plantae Eukaryotes Carryout photosynthesis Most are autotrophs

Q: What do plants need to survive? Sunlight Gas Exchange Water and Minerals

History & Evolution of Plants Q: How did plants adapt to life on land? A: Over time, the demands on life on land favored the evolution of plants more resistant to the drying rays of the sun, more capable of conserving water, & more capable of reproducing without water. Origins in the Water-Algae The First Plants & 4 Main Groups Mosses (bryophytes), Ferns (pteridophytes), Cone-Bearing (gymnosperms) Flowering(angiosperms)

Q: What feature defines most plant life cycles? A: The life cycle of land plants has two alternating phases, a diploid (2N) phase and a haploid (N) phase.

The Plant Life Cycle Alternation of generations-the shift between haploid & diploid Sporophyte-diploid phase spore-producing plant Gametophyte-haploid phase gamete-producing plant