Multiple Choice Answers

Which of the following is likely to have the lowest numbers in an ecosystem?
Producers
Carnivores
Herbivores
Consumers

Each trophic level represents approximately a _____ percent energy _____.
10; loss
90; transfer
50: loss
90; loss

Which of the following would be at the highest trophic level?
A lion
A grasshopper
A mushroom
A grass plant
Pests that eat the same type of food as humans are part of our
Producers
Food web
Food chain
All of these answers are true
Which of the following is NOT a community?
A group of different species living in a pond
A forest
A population of rabbits
A pine tree and the organisms that live on it

Of the choices below, the most energy is contained within the ____ .
Human
Frogs
Plants
Each group contains identical amounts of energy.
Carbon first becomes part of a living thing as a result of
Nitrogen-fixing bacteria
Decomposer organisms
Photosynthesis
Aerobic respiration

____ is a biotic factor in an ecosystem.
Water
Light
Soil
A bacterium

Whether an area of the country will be a desert or a grassland is primarily determined by
The average temperature
The average rainfall
The length of the winter
The kinds of animals in the area
Which one of the following is NOT true of biomass?
Biomass is greatest in producers
Biomass is a measure of productivity
Biomass is the dry weight of organisms
Biomass shows a loss of 10% at each trophic level
The majority of biomass is contained within the
Plants
Insects
Birds
Mammals
Ammonia (NH3) is converted to nitrite (NO2-) by
Decomposers
Nitrogen-fixing bacteria
Nitrifying bacteria
Denitrifying bacteria
A community
Is a population living in a certain habitat
Is a portion of a species making its home within a certain habitat
Includes those animals that only visit a habitat for food and drink
Includes all organisms within its boundaries at a given time
Which of the following is an example of a biome?
AlaskaThe lawn at your college
Sugar cane fields
Australia
Acacia trees often have ants that live on them. The ants feed on materials produced by special structures called nectaries, which the tree produces. The ants will attack other animals that begin to feed on the tree and will even cut off small branches of other trees that come in contact with “their” tree. The relationship between Acacia trees and ants is called
Mutualism
Competition
Predator/prey
Parasite/host
Some animal populations are kept in check by
Hosts
Decomposers
Amensalism
Predators
If a forest fire destroys a region of the forest,
Secondary succession will occur
Primary succession will occur
A climax community is present in the burned area
None of these answers is correct
The term “ecological succession” refers to
The flow of energy from producers to consumers
Replacement of one plant community by another
Successive seasons of the year that guide the growth of ecosystems
An unending series of geological events that occur in all areas
An animal that feeds on living material but does not kill the animal it feeds on is a
Prey
Host
Parasite
Predator
The last stage of succession is the
Early community
Climax community
Biome community
Pioneer community
A ____ is a pioneer organism.
Shrub
Lichen
Tree
Raccoon
An organism serving the role of host is a part of the interaction called
Competition
Mutualism
Parasitism
Predation
An organism that carries a disease between hosts is a
Parasite
Predator
Vector
All of these answers are true
All of the following are examples of symbiotic relationships EXCEPT
Algae and fungi living together as a lichen
The protozoa that live in the intestine of termites and digest cellulose that termites cannot digest
The amoeba that consumes bacteria.
The malaria parasite that lives in the liver of humans
Animal A kills animal D for food; animal C lives in animal D but does not harm D; animal B lives on the surface and sucks blood from D. The animal(s) that is(are) a parasite on animal D is(are):
A
A and C
B
B and C.