Science STAAR Review

a body system that controls growth and homeostasis by secreting hormones from glands.

• skeletal system

• nervous system

• endocrine sytem

• integumentary system

How would a reduction in the snail population effect this ecosystem?

• It would cause decreased competition between spiders and owls.

• It would cause decreased competition between spiders and wood mice.

• It would cause increased competition between grasshoppers and beetles.

• It would cause increased competition between wood mice and shrews.

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Which fill in the blank list is correct and in order

Organisms in an ecosystem must ____ for resources such as water, sunlight, and food. Because of competition, _____ may be limited or depleted in an ecosystem. _______ factors include water, light, and quality of the soil. _______ density can lead to _______ depletion.

• hunt

  resources

  Biotic

  Population

  resource

• compete

  resources

  Biotic

  Population

  resource

• compete

  resources

  Abiotic

  Population

  resource

• compete

  resources

  Abiotic

  Niche

  resource

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Based on the table, native organisms will be negatively affected by competition with lionfish if they-

• hunt in fresh water.

• live on land.

• are longer than 45 centimeters.

• eat invertebrates.

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One explanation for the increasing wild hog population is -

• they are able to escape hunters.

• other wildlife populations have been reduced.

• food supplies have increased across the state.

• they are able to survive in a variety of environments.

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There are three species of birds on an island. Bird A has a pointed bill for eating insects. Bird B has a heavy bill for eating seeds. Bird C has a sharp bill for eating seeds and insects. If the insect populations suddenly disappeared one season, which bird would probably be the least affected that season?

• Bird A

• Bird B

• Bird C

• Bird B and Bird C

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This graph illustrates the effect of pesticides on mosquitoes. Pesticides are applied to the mosquito population every year. Was this a short-term or a long-term change to the environment?

• short-term

• long-term

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Which table correctly categorizes short- and long term changes?

• A

• B

• C

• D

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Artificial reefs, such as old ships placed in the ocean by humans, affect the ecosystems of the ocean. How can these artificial reefs change the ecosystem?

• Artificial reefs provide less protection to small fish.

• Artificial reefs provide a new habitat for organisms.

• Artificial reefs provide more oxygen to organisms.

• Artificial reefs provide additional locations to drill for oil.

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How might the information (in the picture) most directly affect the ocean?

• Fish populations increase along the coasts.

• Runoff from coastal cities carries more pollutants.

• More artificial reefs appear off the coasts.

• Shark attacks decrease.

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