Populations - reteach 2024

A biologist reported that a sample of ocean water had 5 million diatoms of the species Coscinodiscus centralis per cubic meter. What was the biologist measuring?

• Biodiversity

• Density

• Population size

• Carrying capacity

Answer explanation

Because they are counting the population PER CUBIC METER, they are measuring population density.

Density = Population size/Area

Tags

NGSS.HS-LS2-2

A change in the amount of rain would be considered a ___________ factor.

• density-independent

• density-dependent

• biotic

• logistic

Answer explanation

The amount of rain is a density-independent factor as it is not strengthened in a denser population.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

If there are 40 foxes in a 5 sq km area, their population density is ____ foxes/sq km.

Organize these factors into the correct categories.

Groups:

(a) Density-dependent

,

(b) Density-independent

• natural disasters

• weather

• competition

• contagious disease

• predation

Tags

NGSS.MS-ESS3-2

NGSS.MS-LS2-2

Organize these factors into the correct categories.

Groups:

(a) Abiotic

,

(b) Biotic

• plant life

• weather

• water availability

• sunlight

• competitors

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

A group of individuals of the same species in an area is called a _________.

Organize these options into the correct category.

Groups:

(a) Is a population

,

(b) Is NOT a population

• Lions in Africa

• Sea otters in Monterey Bay

• Robins in Gaithersburg

• Crows and blue jays in Maryland

• Blue crabs in the Chesapeake Bay

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

A population has 500 individuals at the start of the month.  The following events occur in the population over the course of 1 month:

• 50 individuals are born

• 41 individuals die

• 9 individuals immigrate

• 4 individuals emigrate

How many individuals are in the population at the end of the month?

A population has 600 individuals at the start of the month.  The following events occur in the population over the course of 1 month:

• 22 individuals are born

• 30 individuals die

• 5 individuals immigrate

• 2 individuals emigrate

How many individuals are in the population at the end of the month?

Which sentence describes the relationship shown on this scatter plot?

• The more time spent training, the longer it takes to run 100 m.  
• As the time spent training increases, the time to run 100 m decreases. 
• As the time spent training decreases, the time to run 100 m decreases. 

Tags

NGSS.MS-PS3-1