Ecology 1: Populations, Communities, Ecosystems Question Preview (ID: 56903)

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Which diagram best illustrates the relationship between humans (H) and ecosystems (E)?

a) 1

b) 2

c) 3

d) 4

One biotic factor that affects consumers in an ocean ecosystem is

a) temperature variation

b) number of autotrophs

c) pH of water

d) salt content

One biotic factor that limits the carrying capacity of any habitat is the

a) level of atmospheric oxygen

b) amount of soil erosion

c) availability of water

d) activity of decomposers

Abiotic factors that characterize a forest ecosystem include

a) temperature and amount of available water

b) pH and number of heterotrophs

c) light and biodiversity

d) types of producers and decomposers

In an ocean, the growth and survival of seaweed, small fish, and sharks depends on abiotic factors such as

a) number of herbivores, carbon, and food

b) sunlight, temperature, and minerals

c) number of decomposers, carbon dioxide, and nitrogen

d) sunlight, pH, and type of seaweed

Which of the following terms describe temperature in the investigation shown?

a) abiotic factor and dependent variable

b) biotic factor and dependent variable

c) abiotic factor and independent variable

d) biotic factor and independent variable

Based on the data provided, at which temperature would the plants most likely use the greatest amount of carbon dioxide?

a) 20° C

b) 40° C

c) 10° C

d) 30° C

Based on the data shown, how much oxygen will plants that live in water at 10° C most likely produce?

a) the same amount of oxygen produced at 40° C

b) the most oxygen produced at any temperature

c) twice the amount of oxygen produced at 20° C

d) more oxygen than is produced at 30° C

The reason that organisms can not produce populations of unlimited size is that

a) there is no carrying capacity on Earth

b) species rarely compete with one another

c) the resources of Earth are finite

d) interactions between organisms are unchanging

What impact do the amounts of available energy, water, and oxygen have on an ecosystem?

a) They recycle the residue of dead organisms.

b) They act as limiting factors.

c) They control environmental temperature.

d) They are used as nutrients.

Which information concerning a desert is provided by the quotation below?

a) identity of a limiting factor and behavior of heterotrophs

b) type of nutrition in animals and distribution of autotrophs

c) daily temperature range and types of autotrophs

d) time of rainy season and type of food used by heterotrophs

Which factors limit environmental carrying capacity in a land ecosystem?

a) A, C, and D, only

b) A, only

c) A, B, C, and D

d) B, C, and D, only

Which letter indicates the carrying capacity of the environment for this population?

a) A

b) B

c) C

d) D

Ten breeding pairs of rabbits are introduced onto an island with no natural predators and a good supply of water and food. What will most likely happen to the rabbit population?

a) It will decrease and then increase indefinitely.

b) It will increase until it exceeds carrying capacity.

c) It will die out due to an increase in the mutation rate.

d) It will remain relatively constant due to equal birth and death rates.

After a rabbit population reaches the carrying capacity of its habitat, the population of rabbits will most likely

a) decrease, only

b) remain unchanged

c) alternately increase and decrease

d) increase, only

The size of a frog population in a pond remains fairly constant over a period of several years because of

a) environmental carrying capacity

b) decreasing competition

c) the depth of water

d) excessive dissolved oxygen

Which letter indicates the part of the graph that represents the carrying capacity of the environment in the jar?

a) A

b) B

c) C

d) D

On which day did the population represented in the graph below reach the carrying capacity of the ecosystem?

a) day 5

b) day 3

c) day 11

d) day 8

The size of a mouse population in a natural ecosystem tends to remain relatively constant due to

a) the lack of natural predators

b) the carrying capacity of the environment

c) increased numbers of decomposers

d) cycling of energy

The section of the graph labeled A represents

a) a population becoming extinct

b) a population at equilibrium

c) biodiversity within the species

d) nutritional relationships of the species

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