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idk ecology
| Question | Answer |
|---|---|
| When individuals in a population reproduce at a constant rate, it is called | exponential growth |
| Which of the following tells you population density? | the number of bacteria per square millimeter |
| Which of the following has a direct role in the nitrogen cycle? a | all of the above |
| The unequal heating of Earth’s surface | all of the above |
| The lowest level of environmental complexity that includes living and nonliving factors is the | ecosystem |
| What does the range of a population tell you that density does not? | the areas inhabited by a population |
| Which of the following is a density-independent limiting factor? | earthquake |
| Which of the following can influence the climate in a small area within a biome? | natural features such as a lake |
| Each of the following is a density-dependent limiting factor EXCEPT | seasonal cycles |
| All of the following factors contribute to Earth’s climate EXCEPT | longitude |
| All of the following are limiting factors EXCEPT | immigration |
| The symbiotic relationship between a flower and the insect that feeds on its nectar is an example of | mutualism because the flower provides the insect with food and the insect pollinates the flower. |
| Nitrogen fixation is carried out primarily by | bacteria |
| In which way does Figure 3–2 differ from a typical model of trophic levels? | First-level consumers outnumber producers. |
| One of the main characteristics of a population is its | geographic distribution |
| The trophic levels in Figure 3–2 illustrate | the relative number of individual organisms at each level. |
| Which of the following descriptions about the organization of an ecosystem is correct? | Species make up populations, which make up communities.This is the correct answer. |
| Which one of the following statements is NOT true of freshwater wetlands? | The water in freshwater wetlands is always brackish. |
| As resources in a population become less available, the population | reaches carrying capacity. |
| The photic zone | extends to a depth of about 200 meters. |
| Which of the following is NOT likely to be a limiting factor on the sea otter population? | drought |
| The movements of energy and nutrients through living systems are different because | energy flows in one direction and nutrients recycle. |
| Which are two ways a population can decrease in size? | decreased birthrate and emigration |
| In a logistic growth curve, exponential growth is the phase in which the population | grows quickly |
| Carbon cycles through the biosphere in all of the following processes EXCEPT | transpiration. |
| A limiting nutrient is to ecosystem productivity as a limiting factor is to population | growth rate. |
| The tendency for warm air to rise and cool air to sink results in | global wind patterns. |
| Most of the energy available to a consumer trophic level is used by organisms for | respiration, movement, and reproduction. |
| The total amount of living tissue within a given trophic level is called the | biomass |
| Demographic transition is change from high birthrates and high death rates to | a low birthrate and a low death rate. |
| Primary succession can begin after | a lava flow |
| If a nutrient is in such short supply in an ecosystem that it affects an animal’s growth, the | substance is a limiting nutrient. |
| Which is most likely to be a limiting nutrient in a freshwater pond? | phosphorus |
| The various growth phases through which most populations go are represented on a(an) | logistic growth curve. |
| When the exponential phase of a logistic growth curve of a population ceases, | population growth begins to slow down. |
| If a population grows larger than the carrying capacity of the environment, the | death rate may rise. |
| A biome is identified by its particular set of abiotic factors and its | characteristic ecological community. |
| Aquatic ecosystems are classified by all of the following EXCEPT | organisms that live there. |
| What is one difference between primary and secondary succession? | Secondary succession begins on soil and primary succession begins on newly exposed surfaces. |
| Which of the following is NOT recycled in the biosphere? | energy |
| Which of the following statements is NOT true about the open ocean? | The open ocean begins at the low-tide mark and extends to the end of the continental shelf. |
| Why must wildlife biologists consider immigration and emigration when studying certain animals? | Animals leave the area in which they were born in search of mates, food, and new territories, and other animals arrive from outside a population for the same reason. |
| How does emigration affect population size? | Emigration is the movement of individuals out of a population, and it reduces population size if all other factors are equal. |
| Describe an important role that pioneer species play in primary succession. | In primary succession, pioneer plants help rocks to break up in the process of soil formation and contribute organic material to the forming soil in which plants can grow. |
| What are greenhouse gases? | Greenhouse gases are atmospheric gases, such as carbon dioxide, methane, and water vapor, that trap heat energy. |
| What is a limiting factor? Give two or three examples. | A limiting factor is a factor that causes population growth to decrease, such as competition, drought, predation, or disease. |
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