AGRC1021 Lecture Notes - Lecture 8: Phragmoplast, Peroxisome, Sporopollenin
6 Aug 2018
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Document Summary
For the first 3 billion years of earth"s history, the land was lifeless. Thin coatings of cyanobacteria existed on land about 1. 2 billion years ag. About 500 million years ago, plants, fungi, and animals joined them. More than 290,000 species of plants inhabit earth today. Most plants live in terrestrial environments, including deserts, grassland. Some species, such as sea grasses, have returned to aquatic hab. The presence of plants has enabled other organisms to survive on land. Plant roots have created habitats for other organisms by stabilizing. Plants are the source of oxygen and the ultimate provider of food for lan. Concept 29. 1 land plants evoled from green algae. Researchers have identified a lineage of green algae called charophyce. Many key characteristics of land plants also appear in a variety of algal. But red, brown, and some green algae also fit this description. So do green algae, dinoflagellates, and brown algae. Plants have chloroplasts with chlorophyll a and b.
