C4 8.11A Organisms and Populations in Ecosystems

Plants that live on the floors of densely populated forests must compete for sunlight. Which type of leaves are most likely found on plants that are best suited to living on the floor of a dense forest?

• Leaves that are needle-shaped

• Leaves that are the smallest

• Leaves that store the greatest amount of water

• Leaves with the greatest amount of surface area

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Students are investigating the characteristics of different plants. They record the characteristics in a table. Which plant would best compete for sunlight in a rain forest environment?

• Plant 1

• Plant 2

• Plant 3

• Plant 4

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According to this food web, which organisms would the bobcat and diamondback rattlesnake compete for if the mouse population and swamp rabbit population decreased?

• Raccoon and sparrow

• Raccoon and Eastern cottontail rabbit

• Sparrow and seeds

• Sparrow and Eastern cottontail rabbit

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Which statement best explains a difference between Plant 1 and Plant 2?

• Plant 1 obtains more water from the soil because of its root surface area and root depth.

• Plant 1 obtains more sunlight because of its root surface area and root depth.

• Plant 2 obtains more water from the soil because of its root surface area and root depth.

• Plant 2 obtains more sunlight because of its root surface area and root depth.

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Three different species of plants that live in the desert are shown. Species Z can successfully share the same environment with the other plants shown because species Z absorbs water —

• found deep underground, and species X absorbs water near the soil surface

• found deep underground, and species X absorbs water found deep underground

• near the soil surface, and species Y absorbs water near the soil surface

• near the soil surface, and species Y absorbs water found deep underground

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Immediately after a forest fire, the primary consumers in the area will compete most for which biotic factor?

• Food

• Space

• Oxygen

• Sunlight

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The graph below shows the range of water conditions preferred by three species of fish in an Ozark stream. Water with which of these conditions would cause the most competition for resources among all three species of fish?

• Very cold, very clear, and very fast

• Very warm, very clear, and very slow

• Mild temperatures, some suspended particles, flows very fast

• Mild temperatures, some suspended particles, flows at a medium speed

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The Prairies Region and the Cross Timbers are located in north-central Texas. The graph below shows information about eating habits of white-tailed deer in these regions. A Cross Timbers rancher is concerned about competition between the ranch animals and the deer. Based on the graph, which ranch animals compete for the most food with white-tailed deer?

• Cattle that eat grass and feed

• Goats that eat weeds and shrubs

• Turkeys that eat seeds and fruit

• Hogs that eat fruit, seeds, and feed

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Which organisms in the food web shown above compete for the same food source in this environment?

• Grasshoppers and snakes

• Hawks and frogs

• Frogs and snakes

• Decomposers and grasses

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A forest food web is shown. The population includes a Dragonfly, Frog, Buzzard, Fox, Ladybird, Snake, Butterfly, Chickadee, Mouse, Greenfly, Grasshopper, Rabbit, Berries, Plantain. Which change would most likely cause a decrease in the frog population?

• An increase in the ladybird population

• An increase in the snake population

• An increase in the butterfly population

• An increase in the number of producers

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