Natural Sciences - Term 2 - Week 7

An ecosystem is a community of living organisms, such as plants, animals, and microorganisms, interacting with their physical environment. These interactions can be complex and include relationships like predator-prey, symbiosis, and competition. Ecosystems can be as small as a puddle or as large as a forest or ocean. Each ecosystem has its own unique characteristics, including climate, soil type, and the types of organisms that live there.

Consider a pond ecosystem. In this ecosystem, you might find fish, frogs, algae, and insects. The fish eat insects, while frogs may eat both fish and insects. Algae provide oxygen and food for fish. This example illustrates how different organisms depend on each other for survival and how they interact with their environment.

As a class, we will discuss local ecosystems that students are familiar with, such as parks, gardens, or rivers. Each student will share one organism they have observed in these ecosystems and describe its role. For example, a student might mention a bird and explain how it helps control insect populations. This discussion will help reinforce the concept of interdependence within ecosystems.

Students will create a simple model of an ecosystem using materials available at home or in the classroom. They can choose any ecosystem, such as a desert, rainforest, or ocean. The model should include at least three different organisms and a brief description of how they interact. Students will present their models to the class, explaining the components and relationships within their chosen ecosystem.

• A group of similar plants
• A community of living organisms interacting with their environment
• A type of animal
• A specific location on Earth

Answer: A community of living organisms interacting with their environment

An ecosystem includes both living organisms and their physical environment, highlighting the interactions among them.

• Plants
• Animals
• Weather
• Cars

Answer: Cars

Cars are human-made objects and do not belong to the natural components of an ecosystem.

Answer: Desert; a cactus.

Deserts are ecosystems characterized by dry conditions, and cacti are well-adapted plants found in these environments.

• They consume other organisms.
• They produce energy through photosynthesis.
• They decompose dead matter.
• They compete for resources.

Answer: They produce energy through photosynthesis.

Producers, such as plants, convert sunlight into energy, forming the base of the food chain.

Answer: Interdependence refers to how different organisms rely on each other for survival.

In ecosystems, organisms depend on one another for food, shelter, and other needs, creating a network of relationships.

• A bee and a flower
• A lion and a zebra
• A tree and a bird
• A fish and algae

Answer: A lion and a zebra

In this relationship, the lion (predator) hunts and eats the zebra (prey).