PCB 3044
PCB 3044 Cook Exam 3 |with Correct
Answers |Graded A+ 2026
Most carnivores have _______ diets, whereas a majority of herbivores have
relatively _______ diets.
Broad, narrow
What does predation result in?
A wide range of capture and avoidance mechanisms
What can cycle with their prey populations?
Predator populations
Predation can affect prey distribution and ______, in some cases causes a
______ from one community type to another.
Abundance, shift
Hudson Bay Co. Began buying beaver pelts from who and how many years ago?
Native Americans, over 200 years ago
Records indicate population cycles of
Snowshoe hares.
Snowshoe Hare Cycles: The populations peak about?
Every 10 years
Hare populations rise and fall in synchrony across
Broad regions of Canada.
Hare reproductive rates reach _____ levels several years _____ hare density
reaches a maximum.
Highest, before
Hare reproductive rates reach lowest levels ____ years after hare density peaks.
2-3
PCB 3044
,PCB 3044
What causes population cycles in hare and lynx?
1. Food supplies become limiting when hare population density is high.
2. Predation by lynx and other predators can explain drop in survival rates.
Predator/Prey relationships can....
-Drive evolution by natural selection in both the predator and prey
-Drive population cycles
-Shift entire ecological communities
Over _____ the species on Earth get energy by feeding on other organisms in a
variety of types of interactions.
Half
Predation is a ____ _____ where individuals of one species (a predator) benefits
by consuming and directly harming individuals of another species.
Trophic interaction
Carnivore
One animal kills and eats another animal, referred to as prey
Herbivore
Eats tissues of living plants or algae
Parasite
Lives in or on another organism (its host) , feeding on parts of it. Usually does
not kill the host; some are disease causing pathogens.
Not all organisms fit neatly into the category of?
Herbivores, Carnivores or Parasites
Some predators such as wolves also eat?
Berries, nuts and leaves (making them omnivore)
Parasitoids are?
Insects that lay eggs on or in another insect host. After hatching, larvae remains
in the host, which they eat and usually kill.
Parasitoids are unusual because?
PCB 3044
, PCB 3044
A predator usually only has one prey over a lifetime and parasite kills the host.
Predator tend to concentrate effort in areas that?
Yield abundant prey
Example of predators concentrating effort in areas that yield abundant prey:
Wolf packs follow seasonal migrations of elk herds.
Sit-and-wait predators such as spiders relocate from areas of scarce prey to
areas where?
Prey are abundant.
Most predators eat a _____ ______ of prey species in relation to their ______.
Broad range, availability
An example of generalists:
Guppies ate disproportionate amounts of whichever prey was most abundant
(flies or aquatic worms).
Specialists predators show a?
Preference
An example of specialists:
Hare constitute 20% of lynx available food, yet make up 60-80% of their diet
These predators may form a ____ _____ of the most common prey type and
switch toward targeting the most common prey.
Search image
Search image
The heightened ability of a predator to detect a target
After an animal _____ ________ with a particular species of prey it becomes
more efficient at capturing and handling that type of prey.
Gains experience
The animal begins to _____ ___ _____ on it, and ignores other prey that did not
fit the search image.
PCB 3044
PCB 3044 Cook Exam 3 |with Correct
Answers |Graded A+ 2026
Most carnivores have _______ diets, whereas a majority of herbivores have
relatively _______ diets.
Broad, narrow
What does predation result in?
A wide range of capture and avoidance mechanisms
What can cycle with their prey populations?
Predator populations
Predation can affect prey distribution and ______, in some cases causes a
______ from one community type to another.
Abundance, shift
Hudson Bay Co. Began buying beaver pelts from who and how many years ago?
Native Americans, over 200 years ago
Records indicate population cycles of
Snowshoe hares.
Snowshoe Hare Cycles: The populations peak about?
Every 10 years
Hare populations rise and fall in synchrony across
Broad regions of Canada.
Hare reproductive rates reach _____ levels several years _____ hare density
reaches a maximum.
Highest, before
Hare reproductive rates reach lowest levels ____ years after hare density peaks.
2-3
PCB 3044
,PCB 3044
What causes population cycles in hare and lynx?
1. Food supplies become limiting when hare population density is high.
2. Predation by lynx and other predators can explain drop in survival rates.
Predator/Prey relationships can....
-Drive evolution by natural selection in both the predator and prey
-Drive population cycles
-Shift entire ecological communities
Over _____ the species on Earth get energy by feeding on other organisms in a
variety of types of interactions.
Half
Predation is a ____ _____ where individuals of one species (a predator) benefits
by consuming and directly harming individuals of another species.
Trophic interaction
Carnivore
One animal kills and eats another animal, referred to as prey
Herbivore
Eats tissues of living plants or algae
Parasite
Lives in or on another organism (its host) , feeding on parts of it. Usually does
not kill the host; some are disease causing pathogens.
Not all organisms fit neatly into the category of?
Herbivores, Carnivores or Parasites
Some predators such as wolves also eat?
Berries, nuts and leaves (making them omnivore)
Parasitoids are?
Insects that lay eggs on or in another insect host. After hatching, larvae remains
in the host, which they eat and usually kill.
Parasitoids are unusual because?
PCB 3044
, PCB 3044
A predator usually only has one prey over a lifetime and parasite kills the host.
Predator tend to concentrate effort in areas that?
Yield abundant prey
Example of predators concentrating effort in areas that yield abundant prey:
Wolf packs follow seasonal migrations of elk herds.
Sit-and-wait predators such as spiders relocate from areas of scarce prey to
areas where?
Prey are abundant.
Most predators eat a _____ ______ of prey species in relation to their ______.
Broad range, availability
An example of generalists:
Guppies ate disproportionate amounts of whichever prey was most abundant
(flies or aquatic worms).
Specialists predators show a?
Preference
An example of specialists:
Hare constitute 20% of lynx available food, yet make up 60-80% of their diet
These predators may form a ____ _____ of the most common prey type and
switch toward targeting the most common prey.
Search image
Search image
The heightened ability of a predator to detect a target
After an animal _____ ________ with a particular species of prey it becomes
more efficient at capturing and handling that type of prey.
Gains experience
The animal begins to _____ ___ _____ on it, and ignores other prey that did not
fit the search image.
PCB 3044
