PIN1 mediates vertical transport of IAA from the shoot to the root along the embryonic apical–basal axis and creates an auxin sink that drives basipetal auxin transport upward from the root apex via PIN2 efflux carriers.

TLS Online TPP Program

#Id: 9576

#Unit 11. Evolution and Behavior

Pre Cambrian- Earliest eukaryotes and multicellular eukaryotes. Oxygen levels increase

TLS Online TPP Program

#Id: 9577

#Unit 11. Evolution and Behavior

Cambrian - Most marine invertebrates. Ozone layer forms

TLS Online TPP Program

#Id: 9578

#Unit 11. Evolution and Behavior

Ordovician - Primitive plants and fungi colonize land, first jawless vertebrates,  Mass extinction at end of period

TLS Online TPP Program

#Id: 9579

#Unit 11. Evolution and Behavior

Silurian - Origin of jawed fishes and arthropods, Invasion of land by primitive land plants

TLS Online TPP Program

#Id: 9580

#Unit 11. Evolution and Behavior

Devonian - First amphibian and first seed plant appear, and insects Mass extinction late in period

TLS Online TPP Program

#Id: 9581

#Unit 11. Evolution and Behavior

Carboniferous - First reptile