Aquatics Final Review

Why do scientists use sampling?

• To create new habitat

• Because each part of an ecosystem is connected to and depends on all the others

• Because ecosystems may change in response to natural or human-caused events

• To estimate populations without having to count each organism

Answer explanation

Samples are easier to collect data from because they are practical, cost-effective, convenient, and manageable.

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Which of the following is not a way that wetlands improve our environment?

• Wetlands are not good places to be used as a nursery or spawning ground

• Wetlands maintain water quality by filtering out pollutants in runoff

• Wetlands help reduce flood damage by acting like a sponge

• Wetlands help to recharge aquifers because they slow down the flow of rainwater

Answer explanation

Also known as “nature's nurseries,” wetlands provide a rich, environment for the development of young amphibians, fish, birds, insects, and mammals.

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What is biodiversity?

• A complex web of relationships between living and non-living things

• The variety and number of different organisms and populations, and the way they live together

• The kinds of aquatic ecosystems found in Texas

• None of the choices are the correct answer

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Which of the following statements describes the oxygen level in a pond?

• The amount of oxygen dissolved in the water stays pretty even over a 24- hour period.

• The water is too deep for plants to grow on the bottom, making it oxygen poor.

• Oxygen levels are high each day while the sun is shining and plants are photosynthesizing, but they can drop dramatically at night

• None of the answers given are correct.

Answer explanation

Dissolved oxygen increases during daylight hours when photosynthesis is occurring and decreases at night when respiration continues but photosynthesis does not.

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Some human activities that reduce aquatic biodiversity include _____.

• Draining a wetland

• Damming a river

• Pumping water out of an aquifer

• All of the answers given are correct

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A ______ is a partly enclosed body of water along the coast where one or more streams or rivers enter and mix freshwater with seawater, while ________ is a body of water enclosed by land that is directly open or connected, to the ocean

Which of the following does not explain how freshwater inflow effects bays and estuaries?

• Provide freshwater for plants

• Provide for many niches (roles) in an estuary ecosystem

• Provide nutrients to feed fish, wildlife, and invertebrates

• All of answers given are incorrect

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How are estuaries connected to oceanic organisms?

• Estuaries provide provide a nursery grounds for oceanic organisms

• Estuaries provide sunlight for oceanic organisms.

• Estuaries provide primary food for oceanic organisms.

• Estuaries provide excess dissolved oxygen for oceanic organisms.

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Why is ocean water denser that fresh water?

• Ocean water contains more salt than fresh water

• Ocean water is deeper that most bodies of fresh water

• Ocean water has waves that move the water around

• Ocean water contains more organisms than fresh water

Which letter represents the intertidal zone?

• A

• B

• C

• D

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