Question Questions On Biodiversity

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Register to read the introduction… 11. What factors usually limit terrestrial populations?
On land, precipitation and soil nutrients are often limiting factors.
12. What factors usually limit aquatic populations?
In water, temperature, sunlight, nutrient availability, dissolved oxygen content, and salinity are limiting factors.
13. What is the overall chemical reaction for photosynthesis?
6CO2 + 6H2O (+ light energy) C6H12O6 + 6O2.
14. What is the overall chemical reaction for respiration?
C6H12O6 + 6O2 ---> 6CO2 + 6H2O + 36 ATP
15. Why are decomposers so significant to an ecosystem?
They recycle the nutrients that make life possible throughout the ecosystem.
16. Why is biodiversity one of our most important renewable resources?
Biodiversity provides us with natural resources, natural services, pleasure, and keeps the balance of the food web.
17. Describe 4 key components of
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Summarize two approaches to sustaining biodiversity.
The ecosystem approach protects populations of species in their natural habitat by preserving sufficient areas of habitats in different biomes and aquatic systems. The species approach protects species from premature extinction by indentifying endangered species and protecting their critical habitats.
20. What trophic level do decomposers consume from?
Decomposers process detritus from all trophic levels.
21. What form of energy is transferred from one organism to another?
Stored energy in the tissues of the organism.
22. Why would the earth be able to support more people if we ate at a lower trophic level?
The energy intake would be higher because there is less loss of energy.
23. Why are there rarely more than 4 or 5 trophic levels within an ecosystem?
Because the food web would not be able to sustain that great of an energy loss in successively higher levels.
24. What is the significance of net primary productivity?
NPP measures how fast producers can provide the food needed by other organisms in an ecosystem.
25. What might happen to us and to other consumer species as the human population grows over the next 40-50 years and per capita consumption of resources such as food, timber, and grassland rises sharply? What are the three ways to prevent this from
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Consider the diagram on page 67 (figure 3-22). Explain why desertification is so significant of an issue and relate that to the significance of net primary productivity.
Dry land ecosystems are already such fragile ecosystems, and many of these delicate ecosystems have the most net productivity.
27. Describe the four types of soil horizons.
The surface litter layer (O horizon) is the top layer and consists of freshly fallen undecomposed or partially decomposed leaves, twigs, crop wastes, animals waste, fungi, and other organic material. It is normally brown or black. The topsoil layer (A horizon) is a porous mixture of the partially decomposed bodies of dead plants and animals, called the humus and inorganic materials such as clay, silt, and sand. The B and C horizons (subsoil and parent material) contain most of a soils inorganic material and lies on bedrock.
28. How does color relate to the quality of the topsoil?
The color of the topsoil suggests how useful a soil is for growing crops. Dark brown or black soil is rich in organic matter and nitrogen. Gray, bright yellow or red topsoils are the opposite.
29. What are the significant properties of

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