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Summary OCR BIOLOGY A MODULE 1 DEVELOPMENT OF PRACTICAL SKILLS IN BIOLOGY
spider diagrams explaining and mapping out all the practical skills needed for OCR Biology A a level.
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BIOLOGY 1.1!
EMILY KINZLER
Emily Kinzler
, EVALUATION OF EXPERIMENTAL METHOD
limitations:
only sampled 1 tree of one species in 1 location
not sampled other vertical surfaces like walls
not used data loggers that can be left for period of time to monitor varying conditions
SOLVING PROBLEMS IN A PRACTICAL CONTEXT data not been statistically analysed to see if difference between north/south facing trees is
state which apparatus/equipment/technique needed significant
apply related knowledge correlation doesnt equal causation
identify+state iv/dv/cv
evaluate proposed method FURTHER INVESTIGATIONS
data shows result but not cause of result
light intensity? - use a light meter to measure light intensity @ sampling areas, would
have to be done on same day/time, on cloudy/sunny day, at same sampling height
temperature? - light heats surfaces so expect it to be hotter on south side of trunk, so
should measure temp at each sampling area, at same hight + day, cloudy/sunny
water availability? - tape test tube to trunk to collect rainwater, each tube must b left for
sme amt of time, sme sampling height, sme days of year, tubes collected @ sme time +
covered to prevent evaporation, measure water content by mass/vol
predation/infection? - is it prey, can it be infected
EXAMPLE OF PROBLEM
is the growth of the single celled green alga
pleurococcus affected by its geographical
position, e.g. north/south facing aspect? what
factors may influence its distribution?
PLANNING WHAT TO DO W/ DATA
bar chart for each individual
visual rep
VARIABLES TO BE CONTROLLED
APPLYING BIO KNOWLEDGE TO PROBLEM species
factors affecting distribution - temp, availability of water, minerals, food, space, mates, ecosystem
light intensity, pollution, competition height
green algae is photosynthetic so grows more where light intensity greater, but can be time of day/same day so weather + temp same
damaged by too strong light intensity, observations show they have greater abundance same person to assess density as subjective
in cooler areas w lower light intensity
"
cant draw conclusions w out investigation
EXPERIMENTAL DESIGN
think about type of data to be collected
belt transect
quadrats
VARIABLES
iv - aspect
dv - result of aspects
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