1. Carbon dioxide and oxygen are important resources in
ecosystems and are
5. The diagram below represents various factors in an
area.
A) recycled through the activity of living and
nonliving systems
B) stored in the animals of the ecosystem
C) lost due to the activities of decomposers
D) released by the process of photosynthesis
2. Which two processes are responsible for keeping the
percentage of atmospheric oxygen at relatively
constant levels?
A)
B)
C)
D)
circulation and coordination
respiration and coordination
respiration and photosynthesis
photosynthesis and circulation
3. Which processes are involved in the water cycle?
A) respiration and photosynthesis, only
B) transpiration and excretion, only
C) respiration, photosynthesis, evaporation, and
condensation, only
D) respiration, photosynthesis, transpiration,
excretion, evaporation, and condensation
4. Many bacteria and fungi are important in the
environment because they
A) return energy to the environment, making it
available for plants
B) recycle nutrients, making them available for
other organisms
C) produce glucose through the process of
respiration
D) reverse the flow of energy in the ecosystem
The diagram best represents
A)
B)
C)
D)
the recycling of energy in a forest community
ecological succession after climatic changes
competition for limited resources in a population
the flow of materials in a forest community
6. Which group of organisms in an ecosystem fills the
niche of recycling organic matter back to the
environment?
A) carnivores
C) producers
B) decomposers
D) predators