#1
What is an Ecosystem?
All living organisms + the nonliving environment in a certain geographical location.
Secondary consumers are those that eat primary consumers, tertiary consumer on secondary and so on…
True or false?
True!
The number of transfers of energy or nutrients from the base to the top of a food web is often called...?
The food chain length
This occur when predators limit the density and/or behavior of their prey and thereby enhance survival of the next lower trophic level. What is...?
Trophic cascades
Pioneer species are not the first species to populate the area. True or false?
False
pioneer species are the first species to populate the area
Compare and contrast biotic and abiotic
Biotic=Living things-Abiotic=Non living things
Biotic components=
Primary producers
herbivores
omnivores
carnivores
detritivores
Abiotic components
sunlight
temperature
water or moisture
rainfall
soil
Residing at the top of a food chain upon which no other creatures prey. What is......?
This does not depend on location! True or false?
Predator
False
This depends on location!
How does island size and distance influence food chain length?
History of community organization (biogeography)
resource availability
limited resources
habitat stability
ecosystem size
Producers= autotroph
True or false?
True
series of changes that occur in an area where the ecosystem exists but has been disturbed (after a fire)
Example: fire – plant growth – mature plants
What is...?
Secondary succession
This describes a single pathway that energy and nutrients may follow in an ecosystem. There is one organism per trophic level, and trophic levels are therefore easily defined. They usually start with a primary producer (autotrophs) and end with a top predator.
What is...?
Food chain.
Scavengers are animals that kill for a meal, but pick on “leftovers” from other animals.
True or false?
False!
Scavengers are animals that do not kill for a meal, but pick on “leftovers” from other animals
food web/food chain = energy
true or false?
true
An ecological community does not consist of all the interacting populations in an ecosystem.
true or false?
False
An ecological community consist of all the interacting populations in an ecosystem.
Organisms that eat plants are called secondary consumers.
True or false?
AND
Primary consumers are NOT herbivores – they only eat plant material.
False!!
Organisms that eat plants are called primary consumers.
Primary consumers are herbivores – they only eat plant material.
Decomposers or detritivores are organisms that do not degrade or decompose dead or organic material in simpler molecules.
True or false?
Fungi and bacteria are not decomposers.
True or false?
False!
Decomposers or detritivores are organisms that degrade or decompose dead or organic material in simpler molecules
Fungi and bacteria are decomposers
a species of animal or plant that is seriously at risk of extinction.
What is...?
Endangered specie
Ecological succession is the process of change in the species structure of an ecological community over time.
True or false?
True!
what are considered to be heterotrophs?
primary consumers
A combination of different food chains is called a ......?
Food web
Producers can produce their own food.
True or false?
True
What is primary succession?
Ans.
series of changes that occur in an area where no soil or organisms exist