Ecosystem: Organization & Competition

1. Organisms in an ecosystem have specific roles, also known as _______ . Organisms in the same area may compete for ________.

Which terms, in order, best complete the sentences?

• niches; unlimited abiotic and biotic resources

• niches; limited abiotic and biotic resources

• habitats; limited abiotic resources only

• habitats; limited biotic resources only

Tags

NGSS.MS-LS2-1

Which best describes how an organism’s niche impacts competition?

• Niches always increase the amount of competition.

• Niches make competition more scarce.

• Species with overlapping niches compete for resources.

• Niches of producers compete with niches of consumers.

Which of the following is an example of organisms competing for resources?

• A bear and an owl eat different foods in the same area.

• Two populations of bears eat the same foods in the same areas.

• Flamingos return to the same area every day to eat brine shrimp.

• Owls eat moths or beetles at night.

Tags

NGSS.MS-LS2-1

Which describes a competitive relationship in the ecosystem as shown in the image?

• Two organisms competing for biotic resources

• Two populations competing for biotic resources

• Two organisms competing for abiotic resources

• Two populations competing for abiotic resources

1. Which option correctly shows the hierarchy of an ecosystem from the lowest level to highest level?

• Organisms, populations, communities, ecosystem

• Ecosystem, communities, populations, organisms

• Ecosystem, populations, organisms, communities

• Organisms, communities, populations, ecosystem

Which best describes how ecosystems are broken down?

• Ecosystems are broken down into communities made of organisms, which are made of populations that live in the same area.

• Ecosystems are broken down into communities made of populations, which are made of organisms that live in the same area.

• Populations are made of communities of the same species that live in the same area.

• Ecosystems are made of communities that live in the same area.

Which is NOT a population in the ecosystem shown below?

• Two or more fish

• A group of seahorses

• A single fish

• 1. A group of seahorses and their young

Tags

NGSS.MS-LS2-1

3. All the white-tailed deer in the Texas Hill Country make up a ________ , while all the plants and animals in the Texas Hill Country make up a _________.

Which terms, in order, best complete the sentence?

• community; population

• ecosystem; community

• population; ecosystem

• population; community

In some forested areas a single species of tall trees will dominate over all of the other species. What would be a reason for the lack of tree diversity?

• lack of rain
• length of growing season
• competition for light
• temperature fluctuations 

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The job or role of a plant or an animal in the ecosystem.

• carnivore

• niche

• consumer

• habitat