Plants and the Colonization of Land. AP Biology – Chapter 29. Evolution of Plants. There were NO PLANTS until about 500 million years ago. Until that time all life had been essentially aquatic… Terrestrial Earth – barren. It’s hard to Imagine…. Evolution of Plants.
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AP Biology – Chapter 29
It’s hard to Imagine…
Evidence for the
Cross-section through a leaf
Each of these circled branch points indicates some new adaptation that led to even more success on land…
A new period of adaptive radiation followed
Sperm must SWIM to egg
DIPLOID Sporophyte grows out of haploid female gametophyte
Fertilization In female gametophyte creates DIPLOID ZYGOTE
MEIOSISoccurs in spore capsule
Spore capsule opens and releases HAPLOID spores
Haploid spores germinate and grow into haploid gametophytes
Haploid spores land in suitable environment
____________occurs in spore capsule