Answers FL-2000315-Biology 1 B-CRRelationships Among Organisms

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How do limiting factors most affect population size?

stop population growth

restrict population growth

increase population growth

decrease population growth

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Humans affect the carbon cycle in many ways through the use of fossil fuels, clear cutting of forests, and controlled burns. Which process can help counteract these human interactions?

photosynthesis

respiration

decomposition

building proteins

A population of wolves in Wyoming experienced a rapid decline. Scientists found that 20 wolves died from rabies, 15 wolves died from mange (a parasitic mite), and 10 wolves died from natural causes. Wyoming experienced a recent drought, and many populations, including deer, bison, and bear, have diminished in the past year. What is best described in this scenario?

Wolves reached their greatest population growth.

Wolves were exposed to too many limiting factors.

Wolves were unaffected by other populations in Wyoming.

Wolves’ breeding season was affected by the drought.

Which best describes the relationship between two species and a niche?

If two species have the same niche, one species will always become extinct.

Two species are able to occupy the same niche in the same habitat.

Two species cannot occupy the same niche in the same habitat.

If two species have the same niche, one species will always move.

The Great Pacific Garbage Patch is an area in the North Pacific Ocean that contains trash and causes harm to ocean life and those that consume that life. What lessons can be learned from this floating pile of trash?

There is no relationship between our daily activities and the environment.

There are more polluters in the Pacific Ocean than in the Atlantic Ocean.

There are areas of the ocean to avoid with boats.

There is a relationship among all living things on Earth.

A relationship in which one organism benefits while the other is neither harmed nor helped is called

predation.

parasitism.

commensalism.

mutualism.

How would a harsh winter most likely affect the rabbit population size?

population decreases

population increases

population reaches carrying capacity

population completely dies off

The tundra ecosystem of Alaska is known as a “cold desert.” It receives very little precipitation, about four inches annually. However, it is rich in wetlands due to permafrost, which traps moisture close to the surface. The temperatures vary widely, also producing persistent winds. Although treeless, the Arctic tundra is an abundant ecosystem. Many organisms find their niche here including many migratory bird species and mammals such as caribou, foxes, bears, and small rodents. Which factor of the tundra ecosystem is biotic?

wind

dead bird

carbon dioxide

temperature

What could explain the curve in this population growth graph?

an unlimited food supply

a natural disaster

a population crash

a reduction in predators

Humans process some foods by adding chemicals to reduce harmful bacterial growth. This allows foods to be edible for longer periods of time. Which best describes the advantages of food processing?

control of density-independent limiting factors such as disease spread

control of density-dependent limiting factors such as disease spread

control of density-dependent limiting factors such as predation

control of density-independent limiting factors such as predation

The size of a food chain can vary, but the number of levels that a food chain can reach is limited.Why does this limit exist?

Plants are not infinite in number.

Producers are limited by consumers.

Carnivores are too large to be eaten.

Energy is lost at each trophic level.

How could the loss of biodiversity affect humans?

It may cause an increase in the human population as competition is reduced.

It may lead to the loss of potential medicines, foods, and products.

It could lead to a decrease in infectious and other diseases that affect humans.

It could cause a decrease in the amount of pollutants on the planet.

Pandas eat bamboo for energy. What are pandas classified as?

producers

consumers

decomposers

autotrophs

What most likely happened to the population of deer in 1963 and 1964?

The population increased its death rate.

The population exceeded past carrying capacity.

The population crashed down to 0.

The population steadily increased to get closer to carrying capacity.

A muskrat population is growing exponentially. What might cause this population to enter logistic growth?

resources become scarce

birth rate increases

emigration decreases

carrying capacity is increased

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