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No Brain Too Small BIOLOGY

AS91603
Demonstrate understanding of the responses of plants and animals to their external
environment
Level 3 5 Credits External

This achievement standard involves demonstrating understanding of the responses of plants and animals
to their external environment.
Achievement Criteria
Achievement Achievement with Merit Achievement with Excellence
Demonstrate understanding of
the responses of plants and
animals to their external
environment.
Demonstrate in-depth
understanding of the responses
of plants and animals to their
external environment.
Demonstrate comprehensive
understanding of the responses
of plants and animals to their
external environment.

Describing plant and animal responses to their external environment.
the process(es) within each response
how the responses occur
the adaptive advantage provided for the organism in relation to its ecological niche.
why the responses provide an adaptive advantage for the organism in relation to its ecological
niche.
Responses are selected from those relating to:
o orientation in space
tropisms,
nastic responses,
taxes,
kineses,
homing,
migration
o orientation in time
annual,
daily,
lunar,
tidal rhythms
o interspecific relationships
competition for resources,
mutualism,
exploitation including herbivory, predation, and parasitism
o intraspecific relationships
competition for resources,
territoriality,
hierarchical behaviour,
cooperative interactions,
reproductive behaviours
External environment will include both biotic and abiotic factors.

No Brain Too Small BIOLOGY

Learning Outcomes:
At the end of this topic I can
Describe the environment in terms of biotic and
abiotic factors.
Distinguish between a tropism and a nastic
response.
Explain the adaptive value of tropisms and nastic
responses.
Explain the role of plant hormones in controlling
plant responses to environmental factors.
Interpret historical experiments relating to
phototropism.
Describe the effect of specific plant hormones on
plant growth and development.
Distinguish between learned and innate behaviour.
Distinguish between a taxis and a kinesis.
Describe the adaptive value of taxes and kineses.
Distinguish between migration and homing.
Identify the environmental cues involved in
triggering migration and homing.
Describe how animals navigate during migration and
homing.
Explain the adaptive value of migratory behaviour
and homing.
Describe how the astronomical cycle creates
environmental cues.
Describe the function of a biological clock.
Use examples to distinguish between the differing
biological rhythms.
Explain the two parts of the mechanism underlying
biological rhythms.
o The endogenous part.
o The exogenous part.
Interpret activity diagrams of organisms, using the
following terms: free running period, phase shift,
entrainment, zeitgeber.
Explain the adaptive value of biological timing.
Define photoperiodism.
Distinguish between short and long day plants.
Explain the role of phytochrome in photoperiodism.
Explain the adaptive value of vernalisation,
dormancy and abscission.
Explain the importance of ritual in preventing
fighting.
Distinguish between territory and home range.
Discuss the adaptive value of territoriality.
Define hierarchy.
Describe how rank is communicated.
Describe the significance of social dominance.
Use field data to determine a linear hierarchy.
Discuss mechanisms by which plants and animals
reduce intraspecific competition.
Define co-operative behaviour.
Describe survival value of group co-operative
behaviour.
Describe the role of courtship behaviours in
breeding.
Explain the adaptive advantage of the pair bond.
Explain the variability in the degree of parental care
in different species.
Explain how having a specific niche reduces
interspecific competition.
Using a predation/prey graph describe the
relationship between predator and prey.
Describe techniques of predation.
Describe strategies used by prey to avoid predators.
Describe plant physical and chemical defences
against herbivores.
Define the terms mutualism, commensalism,
exploitation including herbivory, predation and
parasitism using examples to illustrate definition.

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