Starter https www youtube comwatch voRBHfj Zs UQ
Starter �https: //www. youtube. com/watch? v=o_RBHfj. Zs. UQ
Energy and matter in ecosystems
Objectives �Identify the reasons for energy loss from one level to another in a food chain �Define biomass and biomass pyramid
�Who can remind me what do the arrows show in a food chain?
Energy pyramid �Why do we show energy in a pyramid? 4⁰ CONSUMERS 3 CONSUMERS 2 CONSUMERS 1 CONSUMERS PRODUCERS
�If we have 1000 ants feeding on 1 tree. �We have much more ants. �Does that mean we have more energy in the consumer level than the producer? �That’s why we calculate the biomass
Biomass �It is the dry mass of living things
Transfer of Energy �When a lion eats a zebra, it does not get all of the energy from the zebra. �Energy lost from chain “link” to “link” is significant! �Where does that energy go? �Think among your group for 1 minute and come up with as much answers as you can.
Energy is lost for 3 reasons �Not all individuals in one level are eaten by the upper level (energy is lost to decomposers) �Not all of what is eaten by the consumer is absorbed in the body (energy lost into waste) �Not all of what is absorbed into the body of the consumer is converted to biomass (energy lost in respiration)
Worksheets �Energy flow worksheet �Energy transfer in biomes worksheet
Questions �Why can’t we have more than 5 to 6 levels in a food chain? �Why do we rarely see large carnivores?
Plenary
- Slides: 14