IB Biology Topic 5.1 and 5.2

When a population sees more births than deaths the population is _____.

• growing

• Shrinking

• Not growing

• Emigrating

Monarch butterflies are found on the east and west side of the rockies. This is their _____.

• Population

• Geographic range

• age structure

• Population density

What is NOT a way we can describe a population?

• geographic range

• Age structure

• Distribution

• None of these

A scientist is using a computer to model to predict changes to a population of rabbits in a meadow. Identify the information about the rabbit population that should be included in the computer model.

• birthrate, death rate, rate of immigration, and rate of emigration

• geographic range and nothing else

Tags

NGSS.MS-LS2-4

Green lacewings are used to control aphids, which are pests of many crops. A population of 1000 green lacewings is released into a farmer’s field. The graph shows the change in the population over time. What is the most likely explanation for the approximately constant population of the lacewings after the eighth year?

• The lacewing population had reached the carrying capacity of the field.

• The birthrate of lacewings had increased, while the death rate remained constant

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following describes density- independent limiting factors?

• Environmental extremes

• Parasitism

• Commensalism

• Population increase

A team of scientists visits an island in the Caribbean Sea. They find a diverse community of turtles, lizards, birds, and a variety of trees, shrubs, and grasses. No humans live on the island. Several years later, the scientists return to the island. They find a much smaller community, with reduced populations of all of the species they had identified earlier. Some of the animals now appear to be absent from the island. Which is the most likely explanation for the changes that the scientists observed?

• A natural disaster, such as a hurricane, struck the island.

• Competition for resources caused all of the island populations to decrease at the same time.

Tags

NGSS.MS-LS2-4

On Isle Royale, wolves are the main predators of moose. The graph shows the changing wolf and moose populations on the island over a 50-year time span. Which statement provides the strongest explanation for the trends in the two populations?

• Predator-prey relationships act as density-dependent limiting factors on both predators and prey.

• Predation acts as a density-independent limiting factor on predators, but not on prey

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

How individuals are spaced out in their environment?

• Population distribution

• Age structure

• Population Density

• Immigration

• Emmigration

The amount of males and females at each age

• Population distribution

• Age structure

• Population Density

• Immigration

• Emmigration