Questions and Answers
In which trophic group should the three-toed sloth, Bradypus variegatus, be classified?
What accounts for the small numbers of animals in the highest trophic level of a food chain?
Which describes the nutrition of Euglena?
What is methane gas converted to in the atmosphere?
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What is the mode of nutrition of bacteria that recycle nutrients in ecosystems?
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What is the classification of an organism that is able to make organic compounds from inorganic nutrients?
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How is peat formed?
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What contributes to rising atmospheric concentrations of carbon dioxide and increases in average global temperature?
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What is the best definition of the greenhouse effect in the Earth's atmosphere?
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According to the precautionary principle, what should be done about greenhouse gas emissions?
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What is an appropriate method to determine the significance of a resulting difference in fish growth from differing diets?
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Which of the following describe(s) the female Golden Orb-weaving spider (Nephila plumipes)?
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Which hypothesis is supported by evidence from ecological research?
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Study Notes
Nutrition and Trophic Levels
- Three-toed sloth (Bradypus variegatus) is classified as a consumer, as it feeds on leaves, algae, and fungi in its fur.
- Animals at the highest trophic levels are fewer in number due to energy losses through the food chain and lower energy content of their food.
- Euglena exhibits autotrophic and heterotrophic nutrition, feeding on bacteria and using CO2 for carbon.
Bacteria and Decomposition
- Methanogens produce methane, which converts to carbon dioxide and water in the atmosphere.
- Bacteria play a crucial role in recycling nutrients by digesting organic waste and absorbing molecules; they are classified as saprotrophs.
Autotrophs and Organic Compounds
- Organisms that create organic compounds from inorganic nutrients are classified as autotrophs.
- Peat forms from partially decomposed organic matter in anaerobic and acidic conditions found in waterlogged soils.
Greenhouse Effect and Global Warming
- Rising atmospheric carbon dioxide levels and global temperature increases result from the combustion of fossil fuels.
- The greenhouse effect involves trapping longer wavelength radiation in the Earth's atmosphere.
Precautionary Principle
- To address greenhouse gas emissions linked with global warming, measures should be taken to lower emissions without waiting for additional evidence.
Research Methods
- To assess the significance of growth differences in fish populations fed different diets, a t-test is the appropriate method.
Species Classification
- The female Golden Orb-weaving spider (Nephila plumipes) grows up to 4 cm, is classified as a heterotroph and an arthropod.
Ecological Research Hypotheses
- Decomposers are recognized as contributors to energy recycling in food chains, supporting the hypothesis that decomposers help in nutrient cycling, crucial for producers.
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Description
Test your knowledge on nutrition, trophic levels, and the role of bacteria in ecosystems. Explore concepts such as autotrophs, saprotrophs, and the impact of the greenhouse effect. This quiz covers essential ecological principles and their implications for the environment.
