ORGANISMS AND THE ENVIRONMENT - day two
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Copper compounds are used in large amounts 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?
The fish would grow larger than usual.
The zooplankton population would increase.
The plants would increase in size but decrease in number.
The plant populations would be reduced.
Galveston Bay, an estuary in Southeast Texas, is shown here. The amount of salt in the water changes with the tides. Sometimes the water is mostly freshwater, and sometimes it is mixed with saltwater. Various plant species live in this environment and provide a habitat for other organisms. To successfully live in an estuary, a plant species must have an adaptation that allows it to......
produce large amounts of food
absorb large amounts of water
store excess gases
filter excess salt
Which of these human activities is most likely to cause the excessive growth of phytoplankton in the world's oceans?
The use of chemical fertilizers that are carried by runoff into rivers
The logging of old-growth forests, which results in erosion
The spraying of chemical herbicides that reduce carbon dioxide in the air
The mining of fossil fuels, which requires digging underground tunnels
The graph here shows the percent of seeds from TWO plant species that sprout when grown in water containing different amounts of salt. Which of the following best summarizes the effect of saltwater on these plant species?
Species 1 can sprout only in freshwater, and Species 2 can sprout only in saltwater
Both species can sprout in freshwater and saltwater, but Species 2 can sprout in a higher salt concentration than Species 1.
Both species need salt in their water, but Species 2 needs more salt than species 1
Species 1 can sprout only in water with a low salt concentration, but Species 2 is not affected by the salt concentration.
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