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10 questions
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- Q1Carbon dioxide is returned to the atmosphere primarily by thefallout from solar flares.eruption of volcanoesrespiration of consumersprocess of photosynthesis.30s
- Q2All organic molecules have what element in common?phosphoruscarbonnitrogensulfur30s
- Q3CO2 is returned to the atmosphere by all methods EXCEPTrespirationdecomposition.combustion.photosynthesis.30s
- Q4Which is the correct sequence of events in the nitrogen cycle?atmospheric nitrogen→bacteria→plants→animalssoil nitrogen→atmospheric nitrogen→plants→animalsatmospheric nitrogen→plants→animals→Soil nitrogensoil nitrogen→animals→plants→fungi30s
- Q5According to the diagram of the water cycle, what happens to the water in the oceans before it becomes water in the atmosphere?It turns into precipitation.It becomes a liquid.It evaporates.It is sent to the sun.30s
- Q6The dissolved oxygen in a reservoir was monitored for one year. Based on this data, what might greatly reduce the available dissolved oxygen in an aquatic habitat?fertilizer run-offdecrease in pH due to acid rainincreased water turbiditythermal pollution30s
- Q7Sulfur and phosphorus compounds enter bodies of water, such as ponds, lakes, and riversfrom the decomposition of rocks found on the bottom of bodies of water.as by-products of photosynthesis carried out by aquatic plants.as a by-product of algal blooms.as run-off containing fertilizers and detergents.30s
- Q8Carbon dioxide is constantly exchanged among the atmosphere, ocean, and land. Carbon dioxide is produced and absorbed by microorganisms, plants, and animal by natural processes which help maintain a natural balance. However, since the beginning of Industrial Revolution, human activities have contributed substantially to Carbon dioxide gases in the atmosphere. Which conclusion might be drawn between the relationship found in the graphs of Global Carbon Emissions and Global Temperatures over the past 150 years.decreased Carbon emission from human activities are directly correlated to increased global temperaturesdecreased Carbon emission from human activities are directly correlated to decreased global temperaturesincreased Carbon emission from human activities are directly correlated to increased global temperaturesincreased Carbon emission from human activities are directly correlated to decreased global temperatures30s
- Q9Consider the aquatic phosphorus cycle. Phosphorus is the limiting nutrient for aquatic organisms. Decomposition naturally returns phosphorus to the aquatic cycle, but phosphates from fertilizers, sewage and detergents can cause pollution in lakes and streams. Over-enrichment of phosphate in freshwater can lead to __________ which, when they die and decay, leads to _____________.increased decomposition; poor growing conditionsalgal blooms; eutrophicationa lower pH; acidificationturbidity; decreased photosynthesis30s
- Q10The majority of Earth's atmosphere is nitrogen, N2. The percentage of nitrogen in Earth's atmosphere remains constant as prescribed by the law of conservation of matter and because it is a reasonably non-reactive gas. Like carbon, nitrogen is cycled through Earth's spheres. However, nitrogen can be converted into forms usable by plants and animals, either by lightning or bacteria. Once converted to usable forms, nitrogen is able to cycle the rest of the way through the ecosystem. Much like carbon, the recycling of nitrogen through Earth's spheres relies heavily on what type of organism?decomposersautotrophsparasitesproducers30s
