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Adaptive Leaf Size Week Two (analysis). Hypotheses:. H 1 : Plants in wet soil do not have to conserve water, so they will be as warm as possible to maximize photosynthesis. H 2 : Plants in dry soil must conserve water, so they will be as cool as possible. Predictions :. Wet. Dry. - PowerPoint PPT Presentation
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Adaptive Leaf SizeAdaptive Leaf SizeWeek Two (analysis)
HypothesHypotheses:es:
H1: Plants in wet soil do not have to conserve water, so they will be as warm as possible to maximize photosynthesis. H2: Plants in dry soil must conserve water, so they will be as cool as possible. Predictions :
Predictions: Predictions:
Sunny
Shady
Wet Dry
In the sun, the air temp is the coolest the
leaf can be, so this leaf should be small to
reach air temp and conserve water: get
cool
In the sun, a leaf can be warmed above
the air temp by the sun, so this leaf
should be large to increase photosyn.:
stay hot
Decrease water lossIncrease photosynthesis
In the shade, the air temp is as warm as
the leaf can be, so this leaf should be the air
temp to increase photosyn.: get hot
In the shade, the leaf can get below air temp
(due to evaporative cooling), so this leaf should be large to
conserve water: stay cool
AssumptionsAssumptions::
o Temperature : Temperature : Photosynthesis (to a Photosynthesis (to a point)point)
o Temperature : Temperature : Water lossWater loss
Fun with Fun with Statistics!Statistics!
o We will do 4 We will do 4 t-testst-tests
o DonDon’’t forget where you predicted the t forget where you predicted the larger vs. smaller leaf!larger vs. smaller leaf!
t-test…t-test…
t = X X
sn
sn
1 2
12
1
22
2
t = t-test valueX = group means = st. dev.n = sample size
Food for thought…Food for thought…o According to the model, what environmental factors determine leaf According to the model, what environmental factors determine leaf size?size?
o What other environment factors could influence leaf size?What other environment factors could influence leaf size?
o Why is the model applied to vine-like plants?Why is the model applied to vine-like plants?
o What assumptions did you make to test the model?What assumptions did you make to test the model?o Do you think they were valid?Do you think they were valid?
o Which lab measurements were:Which lab measurements were:o Qualitative?Qualitative?o Quantitative?Quantitative?
Sunny
Shady
Wet Dry
What is important in the wet habitat?
What is important in the dry habitat?
Will this leaf be large or Will this leaf be large or small? WHY?small? WHY?
Sunny
Shady
Wet Dry
Decrease water loss
Increase photosynthesis
Will this leaf be large or Will this leaf be large or small? WHY?small? WHY?
Sunny
Shady
Wet Dry
Decrease water lossIncrease photosynthesis
Sunny
Shady
Wet Dry
Decrease water lossIncrease photosynthesis
Sunny
Shady
Wet Dry
Decrease water lossIncrease photosynthesis
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