predator prey

In this tundra food web, if grasses were removed what would happen to the sustainability of the ecosystem?

• There would be an overpopulation of arctic hares and lemmings.
• Polar bears would move to a new ecosystem.
• The ecosystem would collapse, because it lost its main producer.
• Wildflowers would die out from the ecosystem.

Which graph shows a situation in which the number of predatorss in a population depends on the number of prey?

• Graph F
• Graph G
• Graph H
• Graph J

Which organism is a primary producer?

• phytoplankton
• krill
• copepods
• carnivorous plankton

All of the following statements concerning characteristics of predator-prey relationship are correct EXCEPT:

• The population of predators most often eliminates the population of prey
• A rise in the population of predators is followed by a decrease in the population of prey.
• A rise in the population of prey is often followed by a rise in the population of predators.

In the aquatic food web below, which two organisms have a predator-prey relationship?

• Shad and sturgeons
• Sturgeons and blue crabs
• Blue crabs and rangia clams
• Phytoplankton and amphipods

Which two types of organisms have a producer-consumer relationship in this African savanna?

• Zebras and hyenas
• Hyenas and cheetahs
• Trees and elephants
• Fungi and dung beetles

Which human activity has had a negative impact on ocean systems?

• Monitoring
• Over-fishing
• Creation of artificial reefs
• Reduction in coastal developments

A constant input of energy from the Sun is necessary to maintain any ecosystem. What contributes to the sustainability of an ecosystem?

• Small population sizes
• Lack of adaptations
• Biodiversity
• Unstable environment

Plants are known as producers, because they produce or make their own food. How do producers receive the energy for this process?

• By consuming soil nutrients
• By absorbing sunlight
• By releasing water
• By producing oxygen

Which of the following describes a predator/prey relationship in a marine environment?

• Phytoplankton in the sea make food from sunlight.
• Sharks consume smaller fish they catch in the ocean.
• Frogs in a pond catch and eat flying insects.
• Fish of the same species compete for plants to eat.