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.

1. Organisms with overlapping niches probably have which type of relationship?
a. commensal
b. competitive
c. mutualistic
d. parasitic
2. Analyze each of the sequences in the primary succession of species colonizing a newly formed volcanic island and select the option in the correct order.
*** is it: bare rock, lichens, small annual plants, perennial herbs and grasses, shade tolerant tree?!
if its not that order…plz give me the right order….thnxx!!
3. How does an enzyme influence a biological reaction?
a. It increases the net energy difference between reactants and products.
b. It decreases the activation energy necessary to initiate the chemical change.
c. It increases the kinetic energy of reactants, thereby increasing their tendency to collide.
d. It decreases the kinetic energy of reactants, enabling them to undergo chemical change more easily.
4. A student set up four test tubes containing starch solution in which to perform starch digestion. Supplies included amylase (enzyme that digests starch) and an incubator. In which tube listed starch digestion proceed most quickly?
a. Tube 1: No amylase, room temperature (25*C)
b. Tube 2: No amylase, body temperature (37*C)
c. Tube 3: Amylase present, room temperature (25*C)
d. Tube 4: Amylase present, body temperature (37*C)
5. What occurs during the process of meiosis in humans that cans lead to a child which the conditions of Down Syndrome?
a. production of a duplicate chromosome set
b. production of gametes which are diploid
c. production of gametes with one duplicate chromosomes
d. production of gametes of gametes with one duplicate sex chromosome.
6. Which of the following is the explanation of why bird wings and reptile forelegs are evidence of evolution?
a. Similar functions point to a common ancestor.
b Analogous structures indicate a common ancestor.
c. Vestigial structures point to a common ancestor.
d. Homologous structures point to a common ancestor.
thnx so much guys…nd plz no comments that does not relate to this ok! <3