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An ecosystem is a community that contains living organisms and nonliving things that interact with each other. Which of the following is an example of a nonliving thing in an ecosystem?

أ.

• Plants

• Decomposers

• Air

• Animals

  
  

What is the primary source of energy for almost all life on Earth?

• Water

• Volcanoes

  
  

• The Sun

  
  

What is the main role of a producer in an ecosystem?

• To eat other animals to get energy

  
  

• To make its own food using sunlight

  
  

• To hunt other organisms for food

  
  

• To break down dead organisms

  
  

Which term is used to describe an animal that eats only plants?

• Herbivore

• Decomposer

• Predator

In a food chain, how does the energy flow between a plant, a rabbit, and a hawk?

• Plant →rightarrow$ Rabbit → rightarro → Hawk

• Hawk →rightarro→ Plant →rightarro→Rabbit

What happens to the energy of a living organism when it dies?

• It disappears completely from the ecosystem.

  
  

• It is transferred to decomposers and returned to the soil.

  
  

A snake eats a mouse. The mouse is a primary consumer because it eats grass. What role does the snake play in this food chain?

• Secondary Consumer

  
  

• Primary Consumer

  
  

• Decomposer

  
  

• Producer

  
  

Which of these is considered a decomposer?

• Fungi

  
  

• Grass

  
  

• Rabbit

  
  

• Hawk

  
  

A food chain shows how energy passes from one organism to another. What do the arrows in a food chain represent?

• The type of ecosystem

  
  

• The flow of energy

  
  

• The amount of food available

  
  

• The movement of organisms

  
  

If all the plants in a simple ecosystem suddenly died, what would be the first major problem for the animals in that ecosystem?

• The amount of water would decrease rapidly.

  
  

• The primary consumers (herbivores) would lose their energy source.

  
  

• The Sun would no longer be the primary energy source.

  
  

• A sudden increase in decomposers.