Nutrition System

• Autotrophism is a mode of nutrition where living organisms make their own food
• Heterotrophism is a mode of nutrition where living organisms depend on outside sources for food
• Photoautotrophic organisms use sunlight and other inorganic substances to form organic food
• Examples of photoautotrophs are plants and some forms of bacteria and protists
• Chemoautotrophic uses energy derived from chemical reactions for food
• Examples of Chemoautotrophs are non green plants, bacteria, and archaea
• Xylem transports water and mineral nutrients from the roots to the rest of the plant
• Phloem transports organic substances from the leaves to the rest of the plant
• Transportation in Xylem is called cohesion-tension theory
• Transportation in Phloem is called Translocation
• Dicot plants have a vascular system organized in a ring with the xylem inside surrounded by the phloem
• Monocot plants have the xylem and phloem paired into bundles scattered throughout the stem
• Saprotrophic organisms obtain their nutrients from dead organic matter which include fungi and bacteria
• Parasitic organisms take food from another organism
• Ectoparasitism happens outside of the body of the host
• Endoparasitism happens inside of the body of the host
• Holozoic organisms digest food and absorb nutrients by the body