Affiliate Marketing Secrets

1. Which of the following are biotic factors and which are abiotic factors? (1 point)
Rain and grass are biotic; wind and humidity are abiotic.
Algae and fungi are biotic; temperature and rainfall are abiotic.
Oxygen and sunlight are biotic; maple trees and spiders are abiotic.
Fish and whales are biotic; plankton and bacteria are abiotic.
2. Why is it useful for an ecologist to identify the keystone species in an ecosystem? (1 point)
The keystone species is only important in early stages of succession, and so the ecologist can safely ignore changes in its population at later stages.
The keystone species is the most susceptible to pollution, and so its numbers give an indication of the levels of pollutants in an area.
The keystone species is critical to maintaining the stability of an ecosystem, and changes in its population indicate changes in ecosystem health.
The keystone species is important for the cycling of matter and must be maintained or the biogeochemical cycles will be affected.
3. Competition over resources occurs between organisms (1 point)
participating in an herbivorous relationship.
forming a symbiotic relationship.
attempting to occupy the same niche.
initiating primary succession after a disturbance.
4. The lowest trophic level in an ecosystem (1 point)
has the lowest quantity of stored energy.
has the greatest biomass.
is made up of heterotrophs.
contains detritovores.
5. What is true of the energy that is passed from one trophic level to the next in a food chain? (1 point)
About 10% of the energy passed from one level to the next is released as heat.
About 10% of the stored energy of one level becomes stored energy at the next higher level.
The energy at each level increases by about 10% with each move up in trophic level.
The total energy at all trophic levels is constant, but only about 10% is available for use by organisms for life functions.
6. Autotroph is to producer as heterotroph is (1 point)
herbivore.
consumer.
decomposer.
carnivore.
7. Which of the following is true of population cycles? (1 point)
Population cycles signal an imbalance in an ecosystem.
Keystone species are necessary to establish population cycles.
A new species introduced to an ecosystem tends to stabilize population cycles in the ecosystem.
Population cycling helps maintain a healthy ecosystem.
8. An example of a pioneer species is (1 point)
a sparrow.
a lichen.
an earthworm.
a spider.
9. Why are human disturbances often of more concern than natural disturbances? (1 point)
Human disturbances last much longer than natural disturbances so that a damaged ecosystem may have little or no chance of recovery.
Human disturbances are stronger than natural disturbances and so the recovery needed is much greater.
Human disturbances often cover much wider areas than natural disturbances, which means that more ecosystems are affected.
Human disturbances affect all types of ecosystems, whereas natural disturbances are limited to certain types of ecosystems.
10. Suppose a particular community is concerned about a fox population that kills and eats chickens on the local farms. What is the best course of action by this community? (1 point)
Kill the foxes.
Trap and transport the foxes out of the region.
Introduce rabbits as an alternative source of food for the foxes.
Build enclosures for the chickens that the foxes cannot access.

A.) participating in a herbivorous relationship
B.) forming a symbiotic relationship
C.) attempting to occupy the same niche.
D.) initiating primary succession after a disturbance.

Making a study guide.
1. Predict the change in an ecosystem if an organism is removed or introduced.
2.Describe how the biological concept of a niche helps reduce competition.
3 What is colonization?
4.Communicate the need to prevent animal extinction.
5.Identify the ecological succession as a series of changes in a community in which new populations of organisms gradually replace existing ones form colonization to climax community and through secondary succession after a disaster.
Thanks to all that help!

describe four factors that affect population size
identify factors that limit population growth
explain the difference between primary and secondary succession
differentiate between habitat and niche

1. An organism’s ______ is the role it has in its habitat
A. niche
B. survival
C. succession
D. mutualism
2. The changes in an abandoned field over time are known as _____
A. weathering
B. succession
C. climax
D. homeostasis
3. ____ use the sun’s energy to make complex organic compounds
A. Consumers
B. Producers
C. Decomposers
D. Predators
4._____ are organism’s that break down organic wastes.
A. Consumers
B. Producers
C. Decomposers
D. Predators
5. Large populations of producers are needed to support a small population of
A. scavengers
B. parasites
C. decomposers
D. consumers
6. Which one of the following is an example of a second-order consumer?
A. deer
B. rabbit
C. fox
D. grasshopper
7. Animals that are fed upon by predators are called
A. game
B. mimics
C. populations
D. prey
8. Consumers that feed on dead organisms are
A. parasites
B. scavengers
C. predators
D. pathogens
9. _______ is an association between different species of organisms that is beneficial to both
A. Parasitism
B. Consumerism
C. Mitosis
D. Mutualism
10. A walking stick insect can be mistaken for a twig. This adaptation is
A. competition
B. mimicry
C. strategy
D. limitation
11. Which of the following is a physical factor in an ecosystem?
A. Community
B. water
C. plant
D. bacteria
12. The nitrogen cycle is important because all organisms need nitrogen
A. in the air
B. for photosynthesis
C. to produce ammonia
D. to make proteins
13. Some kangaroos in Australia graze on low-growing plants. Reindeer in the far north also eat low-growing plants. This shows that both have similar
A. niches
B. biomes
C. succession
D. habitats
14. Continued succession in a community will result in
A. natural selection
B. a forest
C. a new ecosystem
D. a stable community

1.
Cougars are predators that often eat weakened or diseased animals. This is a description of the _____ of cougars.
(1 point)
•habitat
•community
•niche
•none of these
3.
____________________ are characterized by complex food webs, many different species of organisms, and little or no succession.
(1 point)
4.
The first organisms to appear in an area undergoing succession are known as ____________________.
(1 point)
5.
The effect of movement of people between counties has _____ effect on total world population.
(1 point)
•a damaging
•little
•a great
no