Unit 1 Ecology Part 1 Interaction of Organisms

A flea leaps onto a dog and settles into the dog's fur. The flea bites the dog and drinks the dog's blood for a meal. What type of symbiosis relationships between the flea and the dog this is?

• Mutualism

• Parasitism

• Commensalism

• Competition

How does an increased population size affect the amount of competition between organisms?

• It increases the competition as the fitness of all involved organisms increases.

• It decreases the competition because additional organisms create more resources.

• It increases the competition because there are more organisms requiring the same resources.

• It decreases the amount of competition as organisms will alter their requirements for survival.

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What is a niche?

• A niche is the role an organism plays in the ecosystem.

• A niche is the long-term relationship between two different species.

• A niche is a group of organisms living in the same area at the same time.

• A niche is a group of different species and the environment they live in.

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Dragonflies eat an average of 40 mosquitoes a day. The graphs below display a population of dragonflies and a population of mosquitoes in a wetland area. Based on the graphs, what best describes the relationship between the dragonfly and mosquito populations?

• As the number of dragonflies increases, the number of mosquitoes decreases.

• As the number of dragonflies decreases, the number of mosquitoes decreases.

• As the number of dragonflies stays constant, the number of mosquitoes increases.

• As the number of dragonflies stays constant, the number of mosquitoes decreases.

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Look at the data table below. What is a commonality amongst these organisms’ diet?

• They both are herbivores.

• They both are omnivores.

• They do not have any commonalities in diet.

• They both are carnivore.

The graph below shows population levels for rabbits and bison in a preserve over a 10-year period. Which statement best explains the changing levels of bison in relation to rabbit population levels?

• When bison populations are large, they compete with rabbits for food on the preserve.

• When rabbit populations are large, they attract natural predators of the bison.

• Rabbit populations are stable except when bison populations are increasing.

• Bison populations are stable except when rabbit populations are increasing.

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Owls and mice are in a predator-prey relationship because owls _____

• help mice find food.

• protect mice from predators.

• compete with mice for food.

• hunt and eat mice.

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The picture shows a forest environment with a stream passing through it. The trees in this picture are best described as _____ factors that absorb nutrients from the _____ soil.

• abiotic, biotic

• biotic, biotic

• biotic, abiotic

• abiotic, abiotic

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An insecticide is used to destroy most of the leaf beetles. What will most likely happen?

• The population of large birds will die out completely.

• Leaf beetles will multiply rapidly and provide more food for small birds.

• Small birds will avoid poisoned insects by preying on grass frogs.

• The grasshopper population will have more available food.

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Many small fish hide from predators in the roots of mangrove trees that grow along the shoreline. The mangrove trees are not affected by the fish. Which type of species interaction is exemplified in this situation?

• predation

• mutualism

• parasitism

• commensalism