Affiliate Marketing Secrets

1.) A population migrated to a new area where there was little competition. The population increased quickly for a period of time and then leveled off. Which statement best explains why the population changed very little after it leveled off?
A.) another species occupied the same niche
B.) the amount of food available stayed the same
C.) the producer population increased
D.) a predator moved out of the area
2.) If humans remove carnivores from an ecosystem which of the following will happen first?
A.) the producers will increase
B.) the population of herbivores will increase
C.) the population of herbivores will grow beyond carrying capacity
D.) fungus will fill the empty niche
3.) Which statement describes forest stratification?
A.) many organisms live in a forest
B.) the forest is divided into layers of different heights
C.) trees will change location
D.) different trees grow in different forests
4.) When certain pesticides are sprayed there is often a large increase in the population of spider mites. which of the following statements best explains this outcome?
A.) the spider mite feeds on pesticide
B.) the pesticide kills the spider mite
C.) the pesticide doesnt kill insects
D.) the insecticide kills the predators of the spider mite
5.) Three species of mice live in the same field. Which best explains the reason they do not compete over resources?
A.) they share food with each other
B.) the mice are able to make their own food
C.) the field has a limited supply of food
D.) the mice occupy different niches
6.) When a population lives in a n environment with limited resources the most likely result is
A.) intraspecific competition
B.) that the population will become extinct
C.) a new population will immigrate to the environment
D.) the population will make new resources
7.) Different plants are able to occupy different areas of a forest because they have different needs for
A.) oxygen
B.) wind
C.) light
D.) carbon dioxide
8.) An organisms relationship to an ecosystem is its
A.) niche
B.) resource
C.) biomass
D.) adaptation
9.) Geographic Information Systems (GIS) can be used by population biologist to
A.) produce more resources
B.) map the areas in which populations live
C.) grow crops
D.) destroy ecosystems
10.) Invasive species can overtake an ecosystem because they
A.) have no natural enemies
B.) are stronger than native species
C.) have natural protection
D.) make their own niche
Short Answers
In one suburban community the deer population has grown much too large. The deer are found in areas near homes and on busy streets. There have been many proposals to reduce the deer population. One method proposed is the ‘bait and shoot’ method, in which food is placed out as deer bait, then a certain number of deer are killed each year.
11.) State two possible reasons the deer population has grown so large. [4]
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12.) Describe one problem the deer may cause in the community. [2]
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13.) How is the bait and shoot method similar to population control in nature? [2]
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14.) State one possible problem with the bait and shoot method. [2]
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15.) Two other proposed methods for population control are:
> trapping and relocating some deer
> treating the deer with birth control drugs
For each of these methods, suggest one possible reasons it was not chosen. [4]
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16.) This is one pond food chain
algae —> rotifer —-> worms —> fish
Describe what will happen to the other three populations if the worm population decreases.
Give one reason for the change in each population. [6]