ACTIVITY 3.3.2: HOMEWORK/ CLASS WORK (GPOUP WOPK) FOOD ChAINS AND I OOD Whes N1025 you should do kesd the following extract carefully and answer the questions set. Nany organisms live on the sand dunes and in the valleys between the dunes, forming a desert community. Ants, crickets, beetles, beelle larvae and termites all feed off seeds and bits of organic matter which larvae which hide in the sand Spiders The ants are eaten by ant-lion eat beetle-larvae and spiders. Sun spiders, which termites. Scorpions devour the scorpions as well as the beetles and beetle larve spiders, eat spiders, beetles and sun spiders. The side-winder ladie. Lizards the lizards. 1. Draw a food web to represent all the feeding relationships in the desert community. (10) 2. Using the food web drawn, now write down any food chain containing:- a. 3 trophic levels b. 4 trophic levels (7) \( [17] \)

To solve the problem, we will first extract the known conditions from the provided text and then proceed to create a food web and identify food chains. ### Known Conditions: 1. Organisms in the desert community: - Producers: Seeds and organic matter (not explicitly mentioned but implied) - Primary consumers: Ants, crickets, beetles, beetle larvae, termites - Secondary consumers: Ant-lions, spiders, sun spiders, scorpions - Tertiary consumers: Lizards 2. Feeding relationships: - Ants, crickets, beetles, and termites feed on seeds and organic matter. - Ant-lions eat ants. - Spiders eat ants and beetle larvae. - Sun spiders eat spiders, beetles, and sun spiders. - Scorpions eat beetles and beetle larvae. - Lizards eat scorpions. ### Step 1: Draw a Food Web We will represent the feeding relationships in a food web format. - **Producers**: Seeds and organic matter - **Primary Consumers**: Ants, crickets, beetles, beetle larvae, termites - **Secondary Consumers**: Ant-lions, spiders, sun spiders, scorpions - **Tertiary Consumers**: Lizards The food web can be represented as follows: ``` Seeds/Organic Matter | v Ants <----> Crickets | v Ant-lions | v Spiders <----> Beetle larvae | v Sun spiders | v Scorpions | v Lizards ``` ### Step 2: Identify Food Chains Now, we will identify food chains containing 3 and 4 trophic levels. #### a. Food Chain with 3 Trophic Levels 1. Seeds → Ants → Ant-lions 2. Seeds → Beetles → Spiders #### b. Food Chain with 4 Trophic Levels 1. Seeds → Ants → Ant-lions → Spiders 2. Seeds → Beetles → Sun spiders → Lizards ### Summary of Answers 1. **Food Web**: (As illustrated above) 2. **Food Chains**: - a. 3 Trophic Levels: - Seeds → Ants → Ant-lions - Seeds → Beetles → Spiders - b. 4 Trophic Levels: - Seeds → Ants → Ant-lions → Spiders - Seeds → Beetles → Sun spiders → Lizards This completes the task of drawing the food web and identifying the food chains.