Unit 3 Life On Earth End Unit Check Test
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Define the terms biodiversity, ecosystem, community, habitat, population, niche
Biodiversity: is the range of species present in an ecosystem Ecosystem: is all of the organism living in a particular habitat Community: refers to all the living organisms in a habitat or ecosystem Habitat: a place where organisms live Population: is the total number of one type of species in an ecosystem Niche: is the role that an organism plays within a community
What are the definitions of producer, consumer, herbivore, carnivore, omnivore, predator, prey
Producer: is a green plant which can make it’s own food from sunlight Consumer: a animal that gains its energy by consuming other organisms Herbivore: a animal that only eats plants Carnivore: a animal that only eats other animals Omnivore: a animal that eats both plants and animals Predator: a animals that hunts and kills prey Prey: a animal that is hunted and killed by another animal
When does competition in an ecosystem occur
Competition in an ecosystem occurs when their is a shortage of recources
What are examples of resources that are fought for during competition
Plants: light, nutrient, water and space animals: food, shelter, water and mates
what are the TWO DIFFERENT types of COMPETITION.
Interspecific competition occurs amongst individuals of different species for one or a few of resources they require Intraspecific competition occurs amongs individuals of the same species and is for all the resources they require
which competition is more intense
intraspecific is more intense as you will be competing for identical things than compared to interspecific which only some resources may be the same
what is a food chain
a food chain is a diagram that shows how energy moves from one organism to another in an ecosystem energy moves along the food chain when one oprganism eats another
what is the order of a food chain
The food chain starts with a producer and is then consumed by the primary consumer (first consumer in the chain). The second consumer eats the first consumer and is called the secondary consumer
what do the arrows represent in the food chain
the arrows in a food chain represent the direction of the energy flow
does the energy flow in seprate indipendent food chains
no it doesn’t it goes through many interlocking and interdependent food cahins this is called a food web
what can you see in the food webs
you can see the interactions between different organisms like how mice and grasshoppers primary consumer eat grains a producer which are then eaten by the owls a secondary consumer
what happens to the energy when it is passed from one level to the next
energy is lossed when it is passed on from one level to the next
why is the enrgy in the food chain lost for and what is the energy not being lossed used for
the enrgy in the food chain being lossed is in movment, heat and undigested material the enrgy not being lossed is used for growth
what happens to a pyramid of numbers is a single producer is present in the pyramid of numbers
it becomes a irregular shape where it becomes smaller on the bottom section
what happens, to the pyramid of numbers if parasites are present
if poarasites are present then the sections representing the parasites become alot bigger than the middle and bottom sections
what is the energy of pyramids measured in
kJ/m2/year
what is a biotic factor
a biotic factor is a living factor that can influence the population of organisms like competition for resources, disease, food availability, grazing and predation.
what happens when predation on prey increases
if predation on prey increases the opulation of prey will decrease.
what happens when grazing is at a low level.
if grazing is at a low level it decreases biodiversity as the dominant plants will outcompete the other species
what happens if grazing is at a high level
if grazing is at a low level biodiversity will increase because dominant polants will be kept in check allowing less dominant plants to grow
what happens if grazing is at a very high level
if garzing is at a very low level biodiversity will decrease as all plants will be eaten and nothing wll be given a chance to grow.
what is a abiotic factor
a abiotic factor is a non-=living factor that can affect the distribution and abundance of plants like light intensity, moisture, pH and temprature
why is light intensity important
light intensity is important because it is required for photosynthesis and light intensity affects the rate of photosynthesis high light intensity=higher rate of photosynthesis low light intensity= lower rate of photosynthesis
what does a plant use moisture for
a plant uses moisture for photosynthesis so a high moisture level will increase the rate of photosynthesis and it helps keep cells in a turgid condition lack of moisture will result in slow rate of photosynthesis and wilting