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Edexcel SNAB A Level Biology Topic 5 Specific Summary Notes

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Edexcel SNAB (Salters-Nuffield Biology A) A Level Biology Topic 5: On The Wild Side. Completed Cornell Notes that are spec-point specific. Contains concise notes that are mark scheme specific and high yield content. Perfect for cramming before an exam or to identify the key information in the specification.

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Topic/spec points:
5.1 Understand the terms ecosystem, community, population and habitat.
5.2 Understand that the numbers and distribution of organisms in a habitat are controlled by biotic and
abiotic factors.
5.3 Understand how the concept of niche accounts for distribution and abundance of organisms in a habitat.


Questions/Keywords/ Notes / diagrams:
definitions:




Write the definitions of the
following key words:
Community, Habitats,
Ecosystems, Populations,
Abiotic and Biotic factors

Explain the effect of pH
levels, light Intensity, Soils
Textures/compaction, and
temperature, on the
distribution of animals and
plants in an
ecosystem/habitat

State what anthropogenic
factors are and how they
might affect the
distribution of organisms
in an ecosystem

Explain how biotic
factors/relationships
affects the distribution of
organisms in a habitat
{Competition
[inter/intraspecific],
diseases [parasitism and
mutualism]

Draw a predator – prey
diagram and explain how
the abundance of each
population is affected by
each other

Define the word niche and
how it is linked to
behavioural, anatomical
and physiological
adaptation of organisms
within it



Summary:

,Topic/spec points:
5.4 Understand the stages of succession from colonisation to a climax community.




Questions/Keywords/ Notes / diagrams:
definitions:




Define Succession

Explain the stages in
primary and secondary
succession

Distinguish with examples
the differences between
pioneer species and
climax community

Explain the link between
deflected succession and
secondary succession

Explain why Deflected
succession is not primary
succession




Summary:

, Topic/spec points:
5.5 Understand the overall reaction of photosynthesis as requiring energy from light to split apart the strong
bonds in water molecules, storing the hydrogen in a fuel (glucose) by combining it with carbon dioxide and
releasing oxygen into the atmosphere.
5.9 Understand the structure of chloroplasts in relation to their role in photosynthesis.

Questions/Keywords/ Notes / diagrams:
definitions:




Label each constituent
part of a chloroplast and
state the function of each
part

Explain what
photophosphorylation,
photolysis and redox
reactions are

Apply the idea of redox
reactions to water
molecules in photolysis
and the formation of
NADPH in the light
dependent reaction




Summary:

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