BIO 320 EXAM 1
How do abiotic factors promote or limit the number of species living
in a region? - CORRECT REPLY>>>>>>-Light, water, oxygen, and
heat are three abiotic factors that influence the amount of life that
an area can sustain. Plants and algae require light to make
carbohydrates (glucose). The biomass in these photosynthetic
organisms supports the survival and reproduction of animals. Fungi
and bacteria rely on the biomass of plants and animals as well.
Therefore, the abundance of light will limit how many and which
species can survive in an area. Additionally, places with little water
will prevent many organisms from surviving. Too little or too much
heat will prevent organisms from surviving as well, because
metabolic reactions require a specific range of temperatures
How do interactions between species promote or limit the number of
species living in a region? - CORRECT REPLY>>>>>>-Competition
usually limits biodiversity. In most cases, competition between
species will prevent some species from persisting. In rare cases,
however, competition promotes speciation through disruptive
selection within populations.
Mutualism benefits all species involved, and therefore promotes the
persistence of those species. However, mutualism among one group
of species can help this group outcompete other species.
, Predation can help maintain diversity when a predator limits the
density of a dominant competitor. You may recall learning about such
keystone species in an introductory biology class.
Imagine that you visit a place for the first time. What metric(s) would
you use to decide whether the place contains a rich biodiversity? -
CORRECT REPLY>>>>>>-Biodiverse places have the following:
many different looking organisms
many species (even if they look similar)
many alleles within populations of species
heterogeneous distributions of life on a small scale (patchy texture)
Imagine two forests: a large forest with few gaps in the canopy; a
patchy forest interrupted by fields of grass.
Re-visit: How would you expect biodiversity to differ between of
these forests? Think about the differences in terms of species, genes,
and ecological processes. - CORRECT REPLY>>>>>>-Large forest
should contain larger populations of each species, reducing loss of
alleles by genetic drift
Large forest would contain only species that rely on resources in
forests, but patchy forest might contain a mixture of species
Large forest would represent fewer ecological processes, because of
one biome rather than a mixture of biomes
How do abiotic factors promote or limit the number of species living
in a region? - CORRECT REPLY>>>>>>-Light, water, oxygen, and
heat are three abiotic factors that influence the amount of life that
an area can sustain. Plants and algae require light to make
carbohydrates (glucose). The biomass in these photosynthetic
organisms supports the survival and reproduction of animals. Fungi
and bacteria rely on the biomass of plants and animals as well.
Therefore, the abundance of light will limit how many and which
species can survive in an area. Additionally, places with little water
will prevent many organisms from surviving. Too little or too much
heat will prevent organisms from surviving as well, because
metabolic reactions require a specific range of temperatures
How do interactions between species promote or limit the number of
species living in a region? - CORRECT REPLY>>>>>>-Competition
usually limits biodiversity. In most cases, competition between
species will prevent some species from persisting. In rare cases,
however, competition promotes speciation through disruptive
selection within populations.
Mutualism benefits all species involved, and therefore promotes the
persistence of those species. However, mutualism among one group
of species can help this group outcompete other species.
, Predation can help maintain diversity when a predator limits the
density of a dominant competitor. You may recall learning about such
keystone species in an introductory biology class.
Imagine that you visit a place for the first time. What metric(s) would
you use to decide whether the place contains a rich biodiversity? -
CORRECT REPLY>>>>>>-Biodiverse places have the following:
many different looking organisms
many species (even if they look similar)
many alleles within populations of species
heterogeneous distributions of life on a small scale (patchy texture)
Imagine two forests: a large forest with few gaps in the canopy; a
patchy forest interrupted by fields of grass.
Re-visit: How would you expect biodiversity to differ between of
these forests? Think about the differences in terms of species, genes,
and ecological processes. - CORRECT REPLY>>>>>>-Large forest
should contain larger populations of each species, reducing loss of
alleles by genetic drift
Large forest would contain only species that rely on resources in
forests, but patchy forest might contain a mixture of species
Large forest would represent fewer ecological processes, because of
one biome rather than a mixture of biomes
