1. 22-1 What is a Plant?
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2. Characteristics of Plants
Kingdom Plantae
Eukaryotes
Carryout photosynthesis
Most are autotrophs

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

4. 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)

6. 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.

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