IB ESS Topic 2.1 Species and Populations

IB ESS Topic 2.1 Species and Populations

Applications and skills

• Interpret graphical representations or models of factors that affect an organism's niche

• Explain population growth curves in terms of numbers and rates

Multiple Choice

If an area has all the wolves that it can support, the wolf population has reached its _____________.

• carrying capacity

• population density

• immigration

• death rate

Multiple Choice

Which of the following is the amount of organisms in a given amount of space?

• Carrying capacity

• Limiting factor

• Emigration

• Population density

Multiple Choice

When a population grows past the ecosystem's carrying capacity, what happens to the population?

• Continues to grow

• The population starts to die off to return to carrying capcity

• The population will go extinct due to lack of resources

• The population grows then finds a new carrying capacity

Multiple Choice

What limits Population Growth?

• birth rates increasing

• resources being used up

• natural selection taking place

• none of the above

Multiple Choice

Exponential population growth can be described as

• growth when resources are limited

• a j-shaped curve

• a s-shaped curve

• growth that reaches carrying capacity

Multiple Choice

Look at this image- What is the carrying capacity of this population?

• 21

• 5000

• 2000

• 1000

Multiple Choice

Look at this image- What is the carrying capacity of this population?

• 21

• 5000

• 2000

• 1000

Multiple Choice

Carrying capacity of a habitat is determined by

• population growth rate

• limiting factors

• j versus s type population growth

• r and k survival strategies

Multiple Choice

A species' realized niche is different from its fundamental niche because of

• abiotic factors of the environment like sunlight

• interspecies interaction like competition and predation

• population fluctuating around an equilibrium level

• carrying capacity of the environment changing over time

Multiple Choice

A fundamental niche is

• all conditions in which a species could survive

• the actual conditions in which a species survives

• trophic level, i.e. primary producer, secondary consumer, etc.

• the number of individuals an environment can support sustainably

Multiple Choice

Which organism do the owl and the weasel compete for in the food web?

• Hawk
• Spider
• Grasshopper
• Shrew

Multiple Choice

Why are decomposers necessary?

• Because we compose too much...

• To take basic materials and make them more complex...

• To take complex materials and break them down to basic stuff...

• So demusic can be really good...

Multiple Choice

At which trophic level can you find an herbivore?

• 1st Level

• 2nd Level

• 3rd Level

• 4th Level

Multiple Choice

In a forest ecosystem, a food chain might look like this:
green plants → rabbit → fox → panther

If the green plants are destroyed in a forest fire, which short-term effect will this have on the organisms in this food chain?

• There would be fewer rabbits for the foxes to eat. 
• The panthers would have to begin to eat green plants.
• There would be an increase in the fox population
• There would be more green plants for the rabbits to eat

Multiple Choice

According to the food web shown, what would occur if there were a drastic decrease in the squirrel population?

• There would be fewer vultures
• There would be more nuts and seeds.
• There would be fewer vultures & there would be more nuts and seeds.
• There would be more grass.

Multiple Choice

Why are food chains, such as the one shown, limited to 4-5 organisms?

• There are not more organisms in the ecosystem
• Organisms must share resources
• Energy transfers are inefficient
• They are only limited when organisms are living on land.

Multiple Choice

Autotrophs are organisms that

• rely on other organisms for their energy & food supply.
• consume plant & animal remains and other dead matter.
• use energy they take in from the environment to convert inorganic molecules to organic molecules.
• obtain energy by eating only plants.

Multiple Choice

All life on Earth exists in a region known as 

• an ecosystem
• a biome
• the biosphere
• ecology

Multiple Choice

An important abiotic factor in ALL ecosystems is the 

• ecology
• climate
• plants
• animals

Multiple Choice

The living factors of an ecosystem, such as plants, animals, & fungi are called

• biotic factors
• abiotic factors
• ecosystem
• population

Multiple Choice

The non-living parts of an ecosystem, such as water, sun, & oxygen are called

• habitat

• abiotic factors

• biotic factors

• ecology