Matter in ecosystems 9th Grade

Indicate which option has a secondary consumer, a primary consumer and a tertiary consumer, in this order:

• A chameleon, a deer, a fox.

• A dog, a trout, a wild boar.

• A cat, a frog, a bear.

• A duck, a rabbit, a chimpanzee

Which is the last trophic level of the ecosystem?

• Decomposers.

• Consumers.

• Producers.

• Parasites.

How do the flows of matter and energy circulate in the ecosystem?

• Open and closed respectively.

• Both closed.

• Closed and open respectively.

• Both open.

In an ecosystem, who normally feeds on the producers?

• Primary consumers.

• Predators.

• Parasites.

• Decomposers.

Indicate which series of organisms does not belong to a trophic chain:

• Bracken, goshawk, mouse.

• Oak, wolf, earthworm.

• Grasshoppers, violet, frog.

• Fox, chestnut, rabbit.

Indicate which trophic chain of the ecosystem fungi occupy:

• Decomposers.

• Producers.

• Primary consumers.

• Parasites.

The chemical elements that make up the living matter of the ecosystem:

• Are continuously recycled.

• Are not recycled, they are exchanged with other ecosystems.

• Need to be continuously replenished.

• Need to be replenished every so often.

Secondary production in an ecosystem is:

• The biomass which can be used as energy source by heterotrophic organisms.

• The amount of organic matter caused by secondary consumers.

• The amount of energy stored in the tissues of heterotrophic organisms.

• The biomass caused by heterotrophic organisms.

Trophic pyramids are represented by:

• Triangles.

• Rectangles.

• Prisms.

• Pyramids.

A biogeochemical cycle is:

• The circulation of a chemical element from the biosphere and the geosphere and vice versa.

• None of the above.

• The passage of a chemical element from some organisms to others within the ecosystem.

• The circulation of a chemical element through the atmosphere, the hydrosphere, the geosphere and the biosphere, which means it can be used over and over again.