Energy Flow in Ecosystems Objectives 1 Describe the
Energy Flow in Ecosystems Objectives: 1. Describe the process of photosynthesis 2. Describe the process of cellular respiration 3. Explain how these processes are dependant on one another.
Energy • Organisms on Earth get most of their energy from the Sun in the form of radiant energy.
30% of the radiant energy is reflected into space. 70% of the radiant energy is absorbed by the hydrosphere and lithosphere and converted into thermal energy. Only 0. 023% of the absorbed energy is used by plants for photosynthesis.
Photosynthesis • Photosynthesis is the process that plants use to convert the Sun’s energy into chemical energy. Through the process of photosynthesis plants are able to make their own food.
Word Equation for Photosynthesis http: //grapevine. net. au/~gr unwald/une/KLAs/science/i rrigation-photosynthesis. gif
Cellular Respiration • Plants store energy in the form of sugar, when they want to use this energy they perform a process called cellular respiration. Cellular respiration converts sugar back into energy.
Word Equation for Cellular Respiration
• Organisms that make their own food are called producers. • Not all organisms can produce their own food so they obtain their energy by eating other organisms. These organisms are called consumers.
Investigation • Complete the investigation on p. 40. • After you have finished, complete questions A -F • H/W: p 41 #1 -3, 5, 6, 10, 11 • How do you think the processes of cellular respiration and photosynthesis are connected?
Plenary • On a sheet of paper write down, • 3 things you learnt in today’s lesson • 2 questions you still have about today’s lesson • 1 way you can find the answer to these questions
- Slides: 10