Ecosystems Part 1

What is the correct definition of an ecosystem?

• Groups of individuals of the same species.

• Made up of the different populations living together.

• All the organisms living in a habitat AND the non-living parts of the habitats e.g. an ocean.

• Trying to get enough resources.

What is the correct definition of a population.

• Groups of individuals of the same species.

• Made up of the different populations living together.

• All the organisms living in a habitat AND the non-living parts of the habitats e.g. an ocean.

• Trying to get enough resources.

Which of the following factors do plants compete for?

• Light, space, water & mates

• Water, mates, space & mineral ions

• Space, water, mineral ions & light

Organisms that make up the living part of an ecosystem.

• abiotic
• biotic factors
• ecology
• ecosystems

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which of the following is a list of abiotic factors?

• light intensity, predators, pH levels

• temperature, moisture levels, oxygen levels

• pathogens, soil pH, light intensity

Tags

NGSS.MS-LS2-3

Which of the following is a herbivore?

• cricket
• frog
• hawk
• shrew

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Below is an example of a simple food chain.

Acorn → Squirrel → Fox → Mountain Lion 

What will most likely happen if squirrels are removed from the food chain?

• The fox will eat acorns
• The fox population will decrease
• The trees will produce fewer acorns.
• The mountain lion population will increase

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

How do the population sizes of predator & prey change in a stable community?

• The size of the predator population continuously increases.

• The size of the prey population continuously decreases.

• The sizes of both populations rise and fall in cycles.

The graph below which shows the changes in the population sizes of two species (X and Y) in a habitat over a period of time.

(b) What is the ecological relationship between X and Y?

• predation

• competition

• mutualism

• parasitism

What can a quadrat be used to measure?

• length

• weight

• population density

• volume

• time