Ecology Populations

If 50 crabs were captured and marked and then released and then a few days later 25 were caught and of those 5 were marked. What would the estimate of the population be?

• 500

• 250

• 75

• 200

Tags

NGSS.MS-LS2-1

Why do scientists use sampling techniques to gather population data?

• their lazy

• it is not possible to count an entire population

• it is possible to count an entire population

• they like to make estimations

If I wanted to know how many blades of grass are inside the track, which sampling method could I use?

• count every blade of grass

• Mark a random number of blades of grass, return two days later and recapture the blades

• Divide the grassy area into 1 inch sections, randomly pick several sections to count, average them together and multiply that by the total square inches.

A marine biologist wants to count the population of salmon in a nearby river. What is the best method for him to use

• Random Sampling

• Capture - Mark - Release - Recapture

• Actual Counting

What is the correct order for this food chain?

• Owl, Mouse, Grasshopper, Grass

• Grass, Mouse, Owl, Grasshopper

• Grass, Owl, Grasshopper, Mouse

• Grass, Grasshopper, Mouse, Owl

Tags

NGSS.MS-LS2-3

In an ecosystem, there are populations of moose, rabbits, grass, and pine trees. Suddenly, a fire blazes through the area, which kills all of the populations. As the months go on, new species of grass begin to take root. This attracts animals, and eventually the ecosystem is restored.

What type of ecological succession happened?

• Primary succession

• Secondary succession

• Tertiary succession

• None of the above

Tags

NGSS.MS-LS2-4

Members of a species in a defined area

• Ecosystem

• community

• biodiversity

• population

What may happen if the snowshoe hare was removed from the food web pictured?

• The insects in the habitat would increase.

• The shrew population would decrease due to being only hawk food source.

• The willow tree population would decrease.

• Foxes would dies due to no food source. 

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

What happens if a population grows past its carrying capacity?

• The population keeps growing

• The population starts to die off

• The entire species will go extinct

• The carrying capacity just increases

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What's missing from the food web?

• decomposers

• producers

• consumers

• autotrophs

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4