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BIOL 1104 Final Exam
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BIOL 1104 Final Exam
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BIOL 1104 Final Exam4 basic mechanisms of evolution Correct Answer 1. Mutation
2. Natural selection
3. Genetic drift
4. Migration
4 postulates of natural selection Correct Answer 1. A trait (i.e.
characteristic) varies
2. This trait is heritable
3. Only some individuals in a population reproduce
4. Individuals with some traits produce more
offspring than others
Abiotic Correct Answer physical/chemical components
abscisic acid Correct Answer • Keeps seeds and buds dormant
• Produced by roots in response to water stress
• Stimulates closure of stomata
• Inhibits growth
Aggressive mimicry Correct Answer the evolution of a
predatory organism to resemble a harmless animal or a part of
the environment, thus gaining access to prey.
allopatric speciation Correct Answer most common mechanism
the process by which new species arise following physical
separation of parts of a population (geographical isolation).
Analogous traits Correct Answer structures that have similar
functions and superficially similar appearance but very different
, anatomies, such as the wings of insects and birds. The
similarities are the result of similar environmental pressures
rather than a common ancestry.
apical meristem Correct Answer the cluster of meristem cells at
the tip of a shoot or root (or one of their branches).
Auxins Correct Answer a plant hormone that influences many
plant functions, including phototropism, gravitropism, apical
dominance, and root branching.
Auxins control tropisms. How? Correct Answer Auxin
concentrations are changed in a stem in response to
environmental stimuli.
- Cells exposed to higher concentrations of auxin elongate more
quickly than those exposed to lower concentrations.
- The stem bends as one side of stem lengthens faster than the
other.
Biological Species Concept Correct Answer Species are
interbreeding or potentially
interbreeding natural populations which are
reproductively isolated from other such groups
Biotic Correct Answer living components
carbon cycle Correct Answer the steps by which carbon moves
from its reservoirs in the atmosphere and oceans through
producers and into higher trophic levels, and then back to its
reservoirs.
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