8.11C

What does biodiversity mean?

• Only one species in an area.
• The different amount of species in an area
• All abiotic life
• Nitrogen fixation

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(8.11C) Some scientists studying aquatic plants notice that flooding often leads to a decrease in the rate of photosynthesis among aquatic plants. Flooding causes more sediment to be suspended in the water. The increased sediment concentration decreases the amount of light that reaches the plants. Why does a decreased rate of photosynthesis lead to a decrease in a plant population?

• Less water is available for absorption.
• Less tissue is available for plant growth.
• Less energy is available for reproduction.
• Less soil is available for leave development.

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Copper compounds are used to control the growth of algae and other aquatic plants. Copper interferes with photosynthesis in these organisms. What would be the most likely result of an accidental spill of these compounds in an aquatic environment?

• Fish would grow larger than usual
• Zooplankton would increase
• Plants would increase in size and decrease in number
• The plant populations would be reduced

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Which process is responsible for carrying fertilizers that have been applied to crops into bodies of water, such as a river?

• Runoff
• Evaporation
• Ocean Currents
• Tectonic Plate movement

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During a period of drought, members of a community may volunteer to water their lawns every other day, rather than daily. The most important benefit of this action is -

• It conserves the groundwater supply.
• It reduces air pollution
• It fertilizes the soil
• It adds nitrogen to the soil

What do we call the land area that supplies water to a river system?

• runoff
• recharge
• watershed
• valley

What are all the factors that affect the amount of runoff?

• area receives, type of soil, shape of land, vegetation
• air, water, ice, dirt
• type of percipitation , shape of land, vegetation

How can we protect the coral reef even if we don't live near it?

• Don't do anything
• Go diving and take fish out
• Don't throw anything in the ocean
• Clean the reefs with soap

Who causes the most damage to coral reefs?

• Whales
• Fish
• Boats
• Humans

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a man made, underwater structure that promotes the growth of reef dwelling aquatic organisms.

• Corral reefs
• Artificial reefs
• organisms
• food

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