BOT 2000 Chapter Notes - Chapter 9: Phloem, Chromosome, Meiosis
18 Apr 2016
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Document Summary
Humans are dependent on plants for life and have influenced our anatomy, culture and society. After the evolution of photosynthesis where a eukaryotic organism engulfed a chloroplast which was a free-living photosynthetic prokaryote, plants were able to make their own food and generate oxygen which oxygenated the planet for other organisms. The first land plants did not produce seeds and their gametes were restricted due to need of moisture. Fossils of non-human hominids show that ancestors of homo sapiens possessed teeth for both tearing and grinding suggesting omnivorous diets. Of the 250,000 to 350,000 species of flowering plants about 20,000 to 30,000 are edible. Humans have eaten about 2,500 with regularity and 150 are in the world of commerce. Green, possess roots, stems, leaves, flowers, and fruits. Over simplisitic definition as we tend to focus on flowering plants that are most useful to humans and some have obsure features.
