Environmental Changes

Ch 3: Interactions in Ecosystems 

Lesson 3: Relationships in Ecosystems

Students are expected to:

- Explain how organisms and populations compete for resources.

- Explain how organisms avoid competition  for resources.

- Explain how living organisms depend on each other through symbiosis, mutualism, commensalism, and parasitism

Multiple Choice

A limited supply of food and shelter in the same habitat will lead to -

• mutualism
• parasitism
• competition
• environmental changes

Multiple Choice

True or False: The population size of predators are equal to the population size of prey.

• True

• False

Multiple Choice

Grass is an example of a

• secondary consumer

• primary consumer

• producer

Multiple Choice

A rabbit is an example of a

• secondary consumer

• primary consumer

• producer

Multiple Choice

The specific environment in which all the biotic and abiotic factors in an area interact.

• Ecosystem

• Organism

• Struggle

• Competitive Interaction

Multiple Choice

Hawks and owls eat the same type of food and struggle with one another to get their food. What is this an example of?

• Competition

• Biotic factor

• Symbiosis

• Population

Multiple Choice

What is another word for something that is ALIVE or was ONCE LIVING

• Biotic

• Abiotic

Multiple Choice

Which of the following would INCREASE the carrying capacity of an ecosystem?

• increase in predators
• disease
• increase in available food
• drought

Multiple Choice

The largest number of individuals that an environment can support long term is...

• carrying capacity

• emigration

• immigration

• population density

Multiple Choice

What happens when an environment reaches its carrying capacity?

• Populations will decrease
• Resources such as food, water, and space will be unlimited
• Populations will increase
• Nothing, everything will stay the same.

Multiple Choice

If a disease destroying barley plants swept through an ecosystem, what would happen to the bird population that eat barley plants?

• The bird population would stay the same

• The bird population would infinitely increase

• The bird population would decrease

Multiple Choice

Any thing or organism that regulates the size of a population of another organism is known as __________.

• a limiting measure
• a limiting factor
• factorization
• materialization of precipitation

Multiple Choice

Limiting factors are sometimes helpful because they can keep the population from getting too large.

• True
• False

Multiple Choice

What is the habitat of a Scorpion?

• arctic

• aquatic

• desert

• forest

Multiple Choice

What is the main reason why Penguin belongs to arctic?

• They like to play with snow

• There's plenty of fish in the sea to eat

• There's lots of snow

Multiple Choice

Racoons eat nuts, fruits, and bird eggs. They like to live in dens or holes. Which of the following habitats would the racoon have the best chance of survival?

• a large, deep lake
• a jungle tree
• a treeless beach
• a wooded forest

Multiple Choice

All habitats are the same 

• True 
• False 

Multiple Choice

A desert habitat is cold and wet.

• True
• False

Multiple Choice

Fish, dolphins, whales, sea turtles, and plants live here. What habitat is this describing?

• Stream
• Polar Region
• Rainforest
• Ocean

Multiple Choice

• polar region

• mountain

Multiple Choice

• polar region

• desert

Multiple Choice

• forest

• mountain

Multiple Choice

• river

• mountain

Multiple Choice

True or False. Many Plants and Animals share the same habitat.

• True

• False

Multiple Choice

Where does this animal live?

Multiple Choice

Where does this animal live?

Multiple Choice

Where does this animal live?