ESS 2 Ecosystems Distinguish between autotroph and heterotroph

ESS 2. Ecosystems

Distinguish between autotroph and heterotroph How would you separate these into 2 groups?

Distinguish between autotroph and heterotroph l Autotrophs (producers) are able to make their own organic molecules as food from inorganic molecules (i. e. via photosynthesis: light energy + H 2 O + CO 2 C 6 H 12 O 6) l Heterotrophs (consumers) obtain an organic food source from other organisms (i. e. autotrophs or from other heterotrophs)

Distinguish between consumers, detritivores and saprotrophs. l We are consumers! This means we ingest living organisms or recently killed organisms as a source of food. But what happens to waste? l Detritivores eat non-living/dead organic matter

Distinguish between consumers, detritivores and saprotrophs. l Saprotrophs live on or in non-living organic matter. They secrete digestive enzymes and absorb the products of digestion. They break down waste material

Describe what is meant by a food chain, giving three examples, each with at least three linkages (four organisms). l Food chain uses arrows ( ) to show the direction of energy flow from one species to another based on feeding relationships energy Task: In your notes, create a food chain with at least four organisms. You will share with the class in 5 min.

Describe what is meant by a food web. l Food web is an interconnecting series of food chains. This better represents the variety of food that an organism eats.

Define trophic level l A trophic level refers to its position in the food chain. Trophic level What are they? T 5 Quaternary consumer Eat tertiary consumers T 4 Tertiary consumer Eat secondary consumers T 3 Secondary consumer Eat primary consumers T 2 Primary consumer Eat producers T 1 Producer Plants/photosynthetic organisms T 1 T 2 T 3 T 4 T 5

Deduce the trophic level of organisms in a food chain and a food web. l A trophic level refers to its position in the food chain. Trophic level T 5 Quaternary Example Lion or None T 4 Tertiary Lion, kite T 3 Secondary Jackal, wild cat, owl T 2 Primary Goat, rabbit, mouse T 1 Producer Green plant/tree Task: Give at least 1 example of each trophic level using the food web given.

Construct a food web containing up to 10 organisms, using appropriate information. Task: Create a food web using the information below: • Plants are eaten by mice and grasshoppers • Tree leaves are eaten by rabbits, squirrels, and grasshoppers • Grasshoppers are eaten by mice and frogs • Fox eats mice and rabbits • Owls and snakes eat frogs • Snakes eat rabbits *Remember, the arrows ( ) show direction of energy flow

Construct a food web containing up to 10 organisms, using appropriate information. Task: Label the diagram as T 1, T 2, T 3, T 4, and T 5