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Page 1

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Topic 5: On the Wild Side

Suggest reasons why 95% of the light hitting the surface of a leaf is not used by the chloroplasts.
(2)*Reflection; *incorrect wavelength/colour/ frequency; *light doesn't hit the chloroplast/
chlorophyll, it is transmitted; *light being in excess e.g. at max. photosynthesis so no more…

Page 2

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Topic 5: On the Wild Side

Suggest why the development of plants depends on the rate of carbon fixation. (3)
*Carbon fixation produces {GP / eq}, this *product is converted to glucose/ starch/ eq. *The faster
the C- Fixation the faster the glucose/ starch production, as the *rate of growth…

Page 3

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Topic 5: On the Wild Side

Because *there is not enough data to *confirm its reliability (*may be place specific). The fact that
there are *great fluctuations in most climate change data suggest that there is no real trend (as
scattered) and thus *poor representation of raw data. *A scatter…

Page 4

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Topic 5: On the Wild Side

Suggest how global warming may affect the distribution of species (3)
*Global warming will increase the temperature (especially at the latitudes) *so that the
temperature may become too high for any of the current species. *This new temperature may be
above the maximum to…

Page 5

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Topic 5: On the Wild Side

increase *because there is less competition for food (from lizards), however the *lizards' predator
may decrease/eat other prey/migrate.

Suggest why an increase in temperature may cause an increase in NPP. (2)
*The rate of (bio)chemical/metabolic/photosynthetic reactions increases due to an *increase in
movement/kinetic energy…

Page 6

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Topic 5: On the Wild Side

shrubs to grow, *these may also out-compete the other species by interspecific competition for
(a)biotic resources. *As the plants continue to lose leaves and die/decay they will *increase the
amount of organic matter/humus.

Why is a climax community stable? (4)
*A climax community is…

Page 7

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Topic 5: On the Wild Side

*restriction of gene flow *between extremes of the population. Each habitat would have different
environmental factors and so different selection pressures. *Mutations may then have arisen
(*causing a change in the allele frequency) and *other plant features so that the *plants adapted
to a…

Page 8

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Topic 5: On the Wild Side

What tissue would form the vessels in a root, following differentiation? Xylem

hydrogen and glycosidic bonds are what would need to be broken to digest cellulose.

Describe the chemical nature of cellulose. (3)
Cellulose is a *polysaccharide with an *unbranched/ straight chain. The cellulose…

Page 9

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Topic 5: On the Wild Side

cytoplasm, where *translation occurs (expand with ribosomes, codon-anticodon interaction).
*tRNA will carry an amino acid and *peptide bonds form between the amino acids on different
tRNA molecules; this I is the *sequence/ order of amino acids is the primary structure of a protein.


Page 10

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Topic 5: On the Wild Side

*Fibrous­ long/linear/straight chains and *Globular­ compact/spherical; *Globular are folded and
fibrous are not; *Globular are soluble and fibrous are not; Fibrous are involved in structural
functions (keratine) and globular are not; *Globular are involved in catalysis/metabolism
(enzymes) and fibrous are not.

Explain how…


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