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Chapter 36 - Ecology
Ecology test
36
Biology
10th Grade
05/23/2010

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Term
What is a community?
Definition
An assemblage of all the populations of organisms living close together for potential interactions.
Term
What is bio-diversity?
Definition
Describes the variety of different kinds of organisms that make up an eco-system.
Term
What are the two parts of bio-diversity?
Definition
  1. Species richness: total number of species in a community
  2. Relative abundance:  the amount of a single species.
Term
What are the (3) properties of community?
Definition
  1. Bio-diversity
  2. Prevalent form of vegitation
  3. Response to disturbances (fire, flood...)
Term
Which eats the other? Predator/Prey
Definition
Predator eats prey.
Term
What is a tick an example of when speaking of relationships?
Definition
Parasitism.
Term
What are (3) examples of defensive adaptations?
Definition
  1. poison
  2. camoflage
  3. mimicry
Term
Given example of Batesian mimicry.
Definition
A palatable/harmless flower mimics a unpalatable/harmful flower.
Term
Example of mullerian mimicry.
Definition
Two bees of different species mimic each other (shape/color)
Term
Example of a "keystone species" and why is it so.
Definition
Orca whale, because they control the population of tertiary consumers.
Term
What is the effect of a lack of a keystone species?
Definition
Other species in the food chain can overproduce.
Term
Define a symbiotic relationship.
Definition
Interaction between two or more species that live together in direct contact.
Term
What is commensalism?
Definition
When one partner benefits without significantly affecting the other. Ex. barnicles on whales.
Term
What is mutualism?  Ex.
Definition
When both species benefit.  Ex. oxen cleaned of bugs by birds.
Term
Give (4) examples of disturbances.
Definition
  1. Storms
  2. Fires
  3. Floods
  4. Overgrazing
Term
What is ecological succession?
Definition
When a different species thrives after a large disturbance.  Ex. Nukes and cockroaches.
Term
What is the difference between primary and secondary succession?
Definition
Primary is the succession when there was virtually no life before. Secondary is when disturbance destroys an already active community.
Term
Why is a fire in a pine forrest likely to destroy mature trees if it occurs in a area that has been protected from fire for many decades?
Definition
Since fuel accumulates on the ground in the form of un-decomposed materials... the fire is hot enough to destroy mature trees.
Term
Define "ecosystem"
Definition
A biotic community and the abiotic environment with which it interacts.
Term
What is an example of a producer?
Definition
Algae.
Term
Who is the consumer of all life in the food chain?
Definition
Detritivores (decomposers)
Term
What is the amount of living organic material in the ecosystem called?
Definition
Biomass.
Term
Why is a pound of bacon so much more expensive than a pound of corn?
Definition
It takes 10 lbs of feed corn to produce 1 lb of bacon.
Term
How many more times of energy is needed to produce the meat we eat rather than the plants themselves?
Definition
100 times.
Term
Give (4) examples of abiotic reservoirs.
Definition
  1. water vapor over the sea
  2. water vapor over the land
  3. surface and ground water
  4. oceans
Term
How does the movement of chemicals in an ecosystem differ from the movement of energy?
Definition
Chemical are recycled between abiotic reservoirs and organic matter. 
Term
What drives the global water cycle?
Definition
The sun.
Term
How much wood could a woodchuck chuck if a woodchuck could chuck wood?
Definition
4-5 cords depending on the pay.
Term
What would happen to the carbon cycle if all the detritivores stopped working?
Definition
Carbon would accumulate in organic mass, the atmospheric reservoir of carbon would decline, and plants would be starved of CO2.
Term
What are nitrogen-fixing bacteria?
Definition
Bacteria that change nitrogen into usable form for plants.  NO3 and NH4.
Term
What is the main abiotic resevoir of nitrogen?
Definition
The atmospheric supply of N2.
Term
What is the main abiotic reservoir of phosphorus?
Definition
Rocks.
Term
What is the relationship between the amount of trees and the amount of nitrates in the soil/water?
Definition
Less trees, more nitrates and vice versa.
Term
Define "eutropication"
Definition
An increase in productivity in an aquatic ecosystem.  Ex. phosphates in a lake lead to overproduction of aquatic life.
Term
Define a "zoned reserve".
Definition
An extensive region of land that includes one or more areas undisturbed by humans.
Term
What is co-evolution?
Definition
When a change in one species affects the selective force (how well they can survive) of another species.
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