HeMS Quizizz 8.11A Ecosystems & Competition

Which of the following are Abiotic factors in a marine ecosystem? (select all that apply)

• Sunlight

• Crabs

• Fish

• Zooplankton

• Ocean water

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The diagram below shows the feeding relationships between organisms in an area. Using only the diagram, which of the following populations of organisms would be affected if the number of grasshoppers changed?

• Only the spider population would be affected

• Only the populations of plants, spiders, and owls would be affected

• Only the populations of spiders, shrews, wood mouses, and owls would be affected

• The populations of all the organisms shown could be affected

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A forest area of California experienced a wildfire 3 years ago. Since the fire, secondary succession has taken place. Researchers have observed the following numbers of different sized plants. What is the best explanation for the recent decline in the number of grasses on the forest floor?

• The small trees and shrubs now cast shadows on the ground and grasses can no longer get the sunlight they need to thrive

• The grasses can no longer get the amount of water they need to thrive

• The small trees have taken up all the space in the soil

• The average temperatures have risen too high for the grasses to continue to grow

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Which of the following must be true in order for competition to take place (select all that apply)?

• The competing organisms must be a part of the same ecosystem

• Only two individual organisms can compete for the same resource

• The competing organisms must compete for the same limited resource

• The competing organisms must compete for only biotic factors

• The competing organisms must compete for only abiotic factors

Anna recorded the growth of several backyard plants last summer. She noted the amount of sunlight and water needed for each plant. This summer there are strict water restrictions because of a drought. Using the information in Anna's chart, which of the following is the most likely result for her backyard in a drought?

• The Sedges and Rosemary will compete for light resources

• Only the Fountain Grass and Easter Redbud will survive the drought

• The Fountain Grass will replace the Honey Mesquites and Sedges

• The Sedges and Honey Mesquites will be the only plants to survive

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Black walnut trees produce a nontoxic chemical that becomes highly toxic when it is exposed to air or soil. How does this chemical help black walnut trees compete with plants growing nearby?

• By attracting herbivores to the other plants

• By suppressing the growth of the other plants

• By increasing the photosynthesis rates in the other plants

• By limiting the amount of water available to the other plants

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Fish in a lake have to compete for space. Different fish have different optimal temperature ranges. The graph below show the temperature ranges of four fish species. At which temperature range will there be the most competition for space amount these fish species?

• 5°C to 10° C

• 10° to 15°C

• 15° to 20°C

• 20° to 25°C

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Using the energy pyramid pictured below, which sentence best describes how energy flows through this pyramid?

• Energy is transferred down each level of the pyramid.

• The energy lost at each level is consumed by the organisms at the top of the pyramid.

• The organisms at the bottom level provide energy directly to organisms in all the other levels.

• Energy is transferred from organisms in one level to the organisms one level above.

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Which of the following are biotic factors in a desert ecosystem? (select all that apply)

• Sand

• Coyote

• Rattlesnake

• Cactus

• Rocks

Use the partial grassland food web pictured. Which of the following best describes a relationship in this grassland?

• Badgers are top predators because they eat upland sandpipers and beetles.

• A producer-consumer relationship exists between lupines and ants..

• A predator-prey relationship exists between beetles and ground squirrels.

• Upland sandpipers are primary and secondary consumers because they eat grasses and grasshoppers

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