These are some review homework questions to get you back into thinking in ecological terms. This homework is the first of the last marking period. Take the time to get 10 of 10...it is due back to me Friday, May 9th
Question #1: Which is a biotic factor that affects the size of a population in a specific ecosystem?
1) the average temperature of the ecosystem
2) the number and kinds of soil minerals in the ecosystem
3) the number and kinds of predators in the ecosystem
4) the concentration of oxygen in an ecosystem
Question #2: Which term includes all of the interactions that occur between the organisms and the physical factors in a pond environment?
1) population
2) ecosystem
3) abiotic
4) competition
Question #3: The amount of salt in the air and water of coastal areas determines which species can exist there. In these areas, salt functions as a
1) source of energy
2) biotic factor
3) food source
4) limiting factor
Question #4: In the biosphere, what are some of the major abiotic factors that determine the distribution and types of plant communities?
1) temperature, sunlight, and rainfall
2) humidity, location, and humans
3) soil type, soil bacteria, and soil water
4) insects, carbon dioxide, and nitrogen in the air
Question #5: An earthworm lives and reproduces in the soil. Through its feeding, excretion, and tunneling activities, the worm adds nutrients and allows air to enter the soil. Together, these statements describe the earthworm's
1) habitat
2) nutrition
3) niche
4) environment
Question #6 Among the populations of any natural community, the basic food supply is always a critical factor because it is:
1) produced by all the organisms of the community
2) synthesized from oxygen
3) a means of transferring energy
4) present in surplus amounts
Question #7 A consumer-producer relationship is best illustrated by:
1) foxes eating mice
2) leaves growing on trees
3) yes rabbits eating clover
4) fleas living on a cat
Question #8 Base your answers to the 3 questions below on the following food chain:{write the answer after the question letter}
rosebush–(eaten by)-aphid-(eaten by)-beetle-(eaten
by)-spider-(eaten by)-toad-(eaten by)-snake
A] Which orgainsm in this food chain can transform light energy into chemical bond energy?
B] At which stage in this food chain will the population with the smallest number of organisms probably be found?
C] If all of the aphid were killed off due to the spraying of pesticides, what would happen to the number of toads this ecosystem could support ?
Question #9 Which sequence illustrates a generalized food chain in a natural community? (read left to right)
1) autotroph--herbivore--carnivore
2) autotroph--herbivore--autotroph
3) heterotroph--herbivore--carnivore
4) consumer--autotroph--carnivore
Question #10: 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.
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