© Oxford University Press España S.A., 2013

Natural Sciences 2

Un

it 12

Matter and energy in ecosystems

© Oxford University Press España S.A., 2013

What is an ecosystem?

What is the relationship between the biotope, biocenosis and ecosystem?

Water in ecosystems

How is water’s property as a solvent related to the life functions of ecosystems?

Biotic factors

What type of families are shown in each photo?

Interspecific relationships

What type of interspecific relationship is shown in this photo?

Matter and energy in ecosystems

What does this diagram represent?

Trophic levels in an ecosystem

What is the role of decomposers in an ecosystem?

Food chains

Describe the main similarities between these two food chains.

Food webs

What are the primary, secondary and tertiary predators in this food web?

Food webs

What is the primary producer in this food web?

The carbon cycle

Describe the three ways that the carbon from organic remains is returned to the atmosphere.

The nitrogen cycle

How do consumers obtain nitrogen and release it into the environment?

The water cycle

What role does the Sun have in the water cycle?

Sustainable development

What can we do to avoid starting forest fires?

What have we learned?

What type of interspecific relationship is shown in image 1?

How is acid rain produced? What effect does it have on ecosystems?

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