Plant Biology - Plant Evolution and Structure

Plants are believed to have evolved from common ancestors: ancient green alga. Plants are multicellular photoautotrophic eukaryotes. The plant cells are grouped to form functional tissues and different tissues are grouped to form organs of the plant body. Plants are considered as Cormophytes, i.e....

Plants are believed to have evolved from common ancestors: ancient green alga. Plants are multicellular photoautotrophic eukaryotes. The plant cells are grouped to form functional tissues and different tissues are grouped to form organs of the plant body. Plants are considered as Cormophytes, i.e. possess an erect stalk. They are all multicellular plants; their cells contain vacuoles and are surrounded by cellulosic walls. They are autotrophic and feed by photosynthesis (the main photosynthetic pigments are chlorophyll a and b, as well as carotenoid accessory pigments) and their carbohydrate is stored in the form of starch in chloroplasts and other plastids. Plants are for the majority terrestrial except for some groups, the aquatic plants, that have evolved back with adaptations to the aquatic environments.