Biology Forums - Study Force

Biology-Related Homework Help Environmental and Conservation Biology Topic started by: oram on Oct 16, 2012



Title: 1. A species that influences an ecosystem to a larger extent than would be expected by?
Post by: oram on Oct 16, 2012
a. climax speciesd. primary producer
b. tertiary consumere. a and b only
c. keystone predator

2. Ecological succession is
a. the changes in species over time
b. the buildup of soil nutrients
c. the process by which a species becomes abundant
d. the changes in a forest as the trees grow larger
e. the gradual process by which the species composition of a community changes

3. How does phosphorus normally enter the atmosphere?
a. respiration
b. photosynthesis
c. rock weathering
d. geological uplifting
e. it does not enter the atmosphere in biologically significant amounts

4. The producers in ecosystems include which of the following?
I. Photosynthetic protists (algae)
II. Cyanobacteria
III. Plants
a. I only
b. II only
c. III only
d. I and III only
e. I, II, and III

5. All of the following statements about energy flow are correct EXCEPT
a. secondary productivity declines with each trophic level
b. only net primary productivity is available to consumers
c. about 90% of the energy at one trophic level does not appear at the next
d. eating meat is probably the most efficient way of tapping photosynthetic
    productivity
e. only about one thousandth of the chemical energy fixed by photosynthesis
    actually reaches a tertiary-level consumer

6. In the nitrogen cycle, the bacteria that replenish the atmosphere with N2 are
a. cyanobacteria d. methanogenic protozoans
b. nitrifying bacteria e. nitrogen-fixing bacteria
c. denitrifying bacteria

7. In which cycle are bacteria important for processes other than decomposition?
a. nitrogen cycle d. phosphorous cycle
b. hydrologic cycle e. energy cycle
c. carbon cycle

8. Primary consumers are
a. autotrophic d. also called herbivores
b. heterotrophic e. b and d only
c. also called producers

9. The concept of trophic structure of a community emphasizes the
a. prevalent form of vegetation
b. keystone predator
c. feeding relationships within a community
d. effects of coevolution
e. species richness of the community

10. According to the ___________, no two species can occupy the same ecological niche
a. mutualism concept
b. competitive exclusion principle
c. pyramid of energy flow
d. resource partitioning hypothesis
e. principle of competing symbionts


Title: 1. A species that influences an ecosystem to a larger extent than would be expected by?
Post by: Zyoxronin on Oct 16, 2012
Content hidden


Title: Re: 1. A species that influences an ecosystem to a larger extent than would be expected by?
Post by: emmajp on Jun 13, 2020
thx