Share Exam #3 Review Honors Biology
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A variable that influences an individuals probability of survival and reproduction in a manner that depends on the size of the population
density-dependent limiting factor
Which of the following would be a limiting factor for a population? (decrease in competition, fewer predators, reduction of disease, loss of habitat)?
loss of habitat
What is the term for something that controls the growth or size of a population?
limiting factor
What is a factor that can increase the growth of the population?
any acceptable answer (births, immigration, abundant resources, etc.)
What is a factor that would cause a decrease in population growth?
Any acceptable answer (deaths, disease, emigration, etc.)
As resources in a population become less available, the population is reaching___.
its carrying capacity
Where on the graph would indicate where the hare reached its carrying capacity?
student points at correct spot on graph
How is the movement of matter through the biosphere different from the movement of energy?
energy - flows in one direction (producers to top consumer; matter - is recycled within and between ecosystems through a series of events
Why are decomposers in soils and water important to ecosystems?
they recycle nutrients
How does transpiration play a role in the water cycle?
it returns water vapor to the atmosphere from a plant
What type of organisms are responsible for "fixing" nitrogen or helping to put it in a form so other living things can use it?
bacteria
Why are nutrient cycles described as being a closed loop?
elements pass between organisms and physical spaces within the biosphere
Why do farmers add fertilizers to their crops?
it contains usable nitrogen and phosphorus that plants can use to grow
How does cellular respiration in plants and animals used in the carbon cycle?
returns carbon dioxide to the atmosphere
Why should farmers be concerned about unused nitrates, from fertilizer use, contaminating surface water and groundwater supplies?
Excessive amounts of nutrients speed up the eutrophication process
What process removes carbon from the atmosphere?
photosynthesis
