This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
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Here are the answers to your questions about the food web: 2.1.1 A food web is a network of interconnected food chains that shows the feeding relationships between different organisms in an ecosystem. 2.1.2 Seaweed is regarded as a producer because it performs photosynthesis, converting light energy into chemical energy (food) for other organisms. 2.1.3 a) Secondary consumer: Octopus* (also Crab, Starfish) b) Herbivore: Periwinkles* (also Limpets) c) Secondary carnivore: Seal* (also Seagull) 2.1.4 Two decomposers normally present in any ecosystem are bacteria and fungi. 2.1.5 A food chain with four trophic levels including periwinkles: Seaweed → Periwinkles → Octopus → Seal* 2.1.6 If all the periwinkles died in the food chain Seaweed → Periwinkles → Octopus → Seal: The seaweed population would likely increase* due to a lack of consumers. The octopus population would decrease* significantly or die out due to their primary food source being eliminated. The seal population would also decrease* due to the reduction in their food source (octopus). 2.1.7 To calculate the percentage of energy passed from limpets to starfish: Step 1: Identify the energy values. Energy from Limpets = 7000 kJ Energy to Starfish = 600 kJ Step 2: Calculate the percentage of energy transferred. Percentage energy transferred = ( Energy to StarfishEnergy from Limpets ) × 100\% Percentage energy transferred = ( 600 kJ7000 kJ ) × 100\% Percentage energy transferred = 0.085714... × 100\% Percentage energy transferred = 8.57\% What's next?