Natural Science - Term 1 - Week 4

Application tasks are designed to help students use their knowledge in practical situations. This week, we will focus on applying what we have learned about ecosystems, energy transfer, and the scientific method. By engaging in these tasks, students will develop critical thinking skills and learn to connect theoretical knowledge with real-world scenarios.

Consider a simple food chain: grass → rabbit → fox. In this example, grass (a producer) converts sunlight into energy through photosynthesis. The rabbit (a primary consumer) eats the grass and gains energy, while the fox (a secondary consumer) eats the rabbit. This illustrates energy transfer in an ecosystem. When discussing this example, students should identify the roles of each organism and the energy flow between them.

In small groups, students will receive a diagram of a local ecosystem. They will label the producers, consumers, and decomposers within the ecosystem. Each group will then present their diagram to the class, explaining the role of each component and how energy flows through the system. This activity encourages collaboration and reinforces vocabulary related to ecosystems.

Students will write a short paragraph reflecting on what they found easy and challenging during the guided practice. They should consider questions such as: What did you learn about energy transfer? Which part of the task did you enjoy the most? What vocabulary did you find difficult? This reflection will help students consolidate their learning and identify areas for improvement.

• An organism that eats other organisms
• An organism that makes its own food
• An organism that decomposes dead matter
• An organism that absorbs nutrients from the soil

Answer: An organism that makes its own food

Producers, such as plants, create their own food through photosynthesis.

• Grass
• Rabbit
• Fox
• Decomposer

Answer: Rabbit

Primary consumers are herbivores that eat producers, like rabbits eating grass.

Answer: A decomposer is an organism that breaks down dead organic material, returning nutrients to the soil.

Decomposers play a crucial role in nutrient cycling within ecosystems.

• Water
• Soil
• Sunlight
• Wind

Answer: Sunlight

Sunlight is the primary energy source that drives photosynthesis in producers.

Answer: Consumers obtain energy by eating other organisms.

Consumers are essential for energy transfer in food chains.

• Energy is lost at each level
• Energy is gained at each level
• Energy remains constant
• Energy is created

Answer: Energy is lost at each level

As energy moves up the food chain, some is lost as heat, making it less available to higher trophic levels.

Answer: Decomposers recycle nutrients back into the soil, which supports plant growth.

Without decomposers, ecosystems would accumulate dead matter and lack essential nutrients.