SCIENCE 7 - ECOSYSTEMS - TRUE FALSE TEST

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Producers are the source of all the food in an ecosystem

true

Producers release carbon dioxide as a result of photosynthesis

true

Scavengers and decomposers are part of the energy pyramid

true

Second level consumers may be carnivores or omnivores

true

The grass and other plants that the squirrel eats is a biotic factor

true

The greatest amount of energy is available at the producer level

true

The non living parts of a habitat are called abiotic factors

true

The two major groups of decomposers are mushrooms and bacteria

true

To be considered a community, populations must live close enough to each other to interact.

true

Water is needed by algae and plants to make food

true

Water is needed by all living things

true

photosynthesis is when plants and algae make their own food using water, sunlight and carbon dioxide

true

A group of organisms that are physically similar and can mate and produce offspring that can reproduce is called a species

true

All the bees in a hive is an example of a population

true

An ecosystem is the interaction of biotic and abiotic factors

true

An organism is a living thing that obtains food, water, shelter and other things it needs to live, grow a reproduce from its environment

true

An organism may play more then one role in a food web

true

Decomposers return raw materials to the environment.

true

Fish get oxygen from the water around them

true

About half the energy at one level is transferred to the next

false

All first level consumers are carnivores

false

All the trees is a forest is an example of a population

false

An organism that is killed is called a predator

false

At each higher level of the pyramid, there is more energy available

false

Every organism has a variety of adaptations that enable it to live in any kind of environment

false

If the birth rate is greater then the death rate the population will decrease.

false

Producers are at the top of the food web

false

Producers take in oxygen during photosynthesis

false

Soil, water, sunlight, temperature and oxygen are all examples of biotic factors

false

The soil that provides the squirrel with a home is a biotic factor

false


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