Thriving in Terrestrial Environments

Answer 1

1. Numerous genera that inhabit soil can form resting stages that enable survival in dry periods 2) Endospores, cysts, fruiting bodies, and mycelium are examples of resting stage structures 2.1) Bacillus and Clostridium species produce endospores 2.2) Azobactor species produce cysts 2.3) Myxobacteria species form fruiting bodies 2.4) Streptomyces species form mycelium 3) Endospores tend to be more resistant to environmental insult than cysts or fruiting bodies 4) Organisms produce numerous mechanisms for nutrient acquisition and retention 4.1) Clustering within a sheath -> Bacteria form chains encased in tubes which enables them to find favorable habitat -> Includes genera Sphaerotilus and Leptothrix 4.2) Derive nutrient from other organisms 4.2.1) Bdellovibrio prey on other organisms 4.2.2) Bioluminescent bacteria establish relationships with other animals for food and protection 4.2.3) Legionella live inside protected confines of protozoa