KS3 Ecosystems

An ecosystem is:

• plumbing and wiring in a house that uses less water and energy than older systems

• all the different physical environmental factors that affect a habitat

• all the different types of organisms in a habitat

• All the organisms in a habitat together with the physical environmental factors.

What do lizards eat?

• mice

• grasshoppers

• hawks

• grass

What might happen if all the rabbits died?

• There would be more hawks because there are fewer rabbits in competition with them.

• There would be fewer lizards because the hawks would eat more of them.

• There would be less grass because the grasshoppers would eat it.

• There would be more snakes because they would not compete with the rabbits.

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The arrows in a food chain show:

• the flow of energy

• the loss of energy

• how animals use energy to move around in a habitat

• how plants make their own energy.

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Using the food web, choose the organisms in the correct order.

• microscopic plants > water fleas > small fish > perch

• microscope plants > perch > water flease > small fish

• perch > waterboatmen > small fish > tadpoles

• microscopic plants > tadpoles > water boatman > perch

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The process by which plants make food from sunlight is called.....

• Respiration

• Photosynthesis

• Transpiration

• Using food webs

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Which group do fungi, bacteria, and termites belong to?

• decomposers
• producers
• herbivores
• omnivores

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Which organism make their own food through the process of photosynthesis? 

• decomposer
• consumer
• herbivore
• producer 

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Field mice eat corn. Which would most likely happen if the field mouse population grew?

• There would be more corn to feed the field mice.
• There would be less corn due to the mice eating it.
• The habitat would get overpopulated because the mice woudl eat too much.

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If the population of prey increases, the population of predators will ________because of the availability of food.

• decrease
• stay the same
• increase

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