Oxygen Cycles and The Food Chain Unit 2: Basic Plant Science
20 in 10 - PLANTS!!! • Label a piece of paper 1-20 • In addition to consumption, plants serve other purposes as well… • Come up with twenty items that you have used in the last several weeks that were made from or had plant products as one of the ingredients.
The Food Chain • Who loves to eat!?! • What is your favorite food? • Who knows what the food chain is or has seen a diagram of the food chain before? • Do you know what is at the basis of the food chain?
The Food Chain • Plants are the basis of the food chain for all living things. • Plants are essential to life on earth.
The Food Chain • The food chain can be divided into three categories: • Consumers • Can not produce their own food so must eat other organisms for energy. • Producers • Produce their own food. Like Plants! • Decomposers • Eat decaying matter - dead plants and animals and in the process they break them down and decompose them. When that happens, they release nutrients and mineral salts back into the soil - which then will be used by plants!
OXYGEN!!! • We breathe in oxygen • The oxygen is absorbed into our blood cells • It goes through our body • It is used up • The leftovers are then converted to CO2 (carbon dioxide) and released • Plants provide the oxygen we breathe.
OXYGEN • Plants balance the amount of oxygen and carbon dioxide in the air through two processes: • Transpiration • Respiration • What if the elements were not balanced?
Photosynthesis • Transpiration is a result of photosynthesis by which plants produce oxygen as a byproduct. • Photosynthesis: • The process by which plants use light to produce food for themselves. • We will discuss this topic further later….
Transpiration & Respiration • Transpiration: • the process of releasing water vapor containing oxygen in exchange for carbon dioxide. • Think of “perspiration” in humans! Sweat! • Respiration: • the exact opposite of photosynthesis and transpiration • Respiration is the process of using oxygen and producing carbon dioxide. • The oxygen is used to breakdown and use food resulting in the release of carbon dioxide, no light is required therefore this process occurs 24 hours a day
The Oxygen Cycle • Plants carry out minimal respiration • BUT animals and humans respire with every breath • When we respire, plants take in the carbon dioxide and convert it to oxygen which is then released. • This entire process is called the Oxygen Cycle! • What does it look like?
ACTIVITY • Create: • A chart of the Oxygen Cycle • Show the interaction between plants and humans • A food chain including: (label each) • A decomposer • A producer • A primary consumer • A secondary consumer (eats the primary consumer)