Unit 7: Why are fish food and not friends?

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Presentation transcript:

Unit 7: Why are fish food and not friends? DO NOW: Qs 1-3.  What is an appropriate title for this diagram (1) Energy Flow in a Community (2) Biological Evolution (3) Ecological Succession (4) A Food Chain 2. Explain the role of the bacteria in the food web pictured to the right. ________________________________________ ________________________________________________

3. Certain organisms are able to store energy from the Sun in energy-rich compounds. Which event best illustrates this activity? (1) A fox captures and eats a young rabbit. (2) A caterpillar is eaten by a blackbird. (3) Lettuce produces organic substances. (4) Bacteria change organic material into simple nutrients.

Energy Pyramid

Energy Pyramid for the following food chain: DandelionRabbitSnakeEagle

Is this a stable ecosystem? Why or why not?

HOLD THE PHONE… WHERE IS ALL THE ENERGY GOING?!

Organisms use some of the energy from their food and it is also lost as HEAT

STOP & THINK! Think, Pair, Share 1. In an ecosystem, one population of organisms has 987 members and another population has 300 members. Which population is the predators and which is the prey? How did you know? 2. You are stranded on a desert island. Decide which ONE type of organism you should eat considering the amount available and energy it would provide (not its taste ). Explain your answer. 3. Do you think energy is recycled in ecosystems? Why or why not?

Practice Problems An energy pyramid is shown below. Which graph best represents the relative energy content of the levels of this pyramid?

2. Which condition would most likely upset the stability of an ecosystem? (1) a cycling of elements between organisms and the environment (2) energy constantly entering the environment (3) green plants using sunlight to make organic compounds (4) a greater mass of animals than plants

3. The arrows represented as most likely indicate energy released into the environment as heat (2) oxygen produced by respiration (3) the absorption of energy that has been synthesized (4) the transport of glucose away from the organism

4. Bluegrass grows & covers the American Midwest Grasslands and is eaten by prairie dogs. Rattlesnakes often eat these prairie dogs. When not under cover, rattlesnakes are in danger of being swooped up and eaten by large birds of prey. (a) Write a food chain to represent this passage. (b) Draw an energy pyramid for this chain. Can give them a chain to start or use a web, or give them instructions to choose just 4 organisms from the web to make a pyramid.