Only 4 days to do these. Due back to me by the 18th. We have completed the first marking period. This homework will be the first for the 2nd marking period. Recall in class I changed the way homework is to be counted. All homeworks for the period will be counted as one test. This is like having an open book test...five questions a week. Make certain the answers are correct and you will get 100%..one of 3 test added together.
Here are the questions for this week.
Question #1: Before it was banned, the insecticide DDT was used to combat an organism called the red mite. An unexpected result of the use of DDT was that the population of the red-mite increased rather than decreased, While the population of insect predators of the red mite decreased. What can be inferred from this situation?
A) Environmental changes that affect one population can affect other populations.
B) The red mite and its insect predators were all competing for the same resources.
C) the red mites were immune to the effects of insecticides.
D) Using insecticides is a reliable way to eliminate all insect predators
Question #2: Chittenango Falls State Park in central New York State is the only know habitat for an endangered species of aquatic snail. Contaminatin of its water supply and reduction of its habitat have threatened the future of this snail. Which step could be taken to protect this species of snail?
A) banning human activities that damaged the habitat
B) introducing a new snail predator into the habitat
C) transferring the snail to a terrestrial environment
D) Crossbeeding the snail with another species
Question #3:Decomposition and decay of organic matter are accomplished by the action of
A) green plants
B) bacteria and fungi
C) viruses and algae
D) scavengers
Question #4: What is a characteristic of a stable environment?
A) It usually contains only one type of producer.
B) It usually contains a great diversity of species
C) It contains simple food chains that have more consumers than producers.
D) It contains complex food webs that have more heterotrophs than autotrophs.
Question #5: Which change would usually increase competition among the squirrel population in a certain area?
A) an epidemic of rabies among squirrels
B) an increase in the number of squirrels killed on the highways
C) a temporary increase in the squirrel reproduction rate
D) an increase in the number of hawks that prey on squirrels
Question #6: A predator affects the population of its prey, but a parasite may not have the same effect on its host population. Explain why? The answer is that the prey is dead as soon as the predator comes in contact with it and therefore it cannot breed..the parasite/host relationship on the other hand is a long term one, even though often the host does die, and therefore the host can breed at least once...thus the parasite does not have an affect on the population.
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