Transcript File

IT’S A
GREEN WORLD
Transport in plants
Starter
What weather conditions make a good
drying day?
Transport in plants
Learning objectives
Success criteria
Students should understand :
 Describe and explain
the factors that affect
the transpiration rate.
 the effects of different
conditions on the rate of
transpiration
 Understand how some
species are adapted to
reduce water loss by
transpiration.
 be able to describe how
this can be measured in
experiments
 relate plant structure to
environmental conditions
Transpiration
Water moving through a plant is a bit like the way
you drink liquid through a straw.
It is ‘sucked’ up from the top, with liquid being
replaced at the bottom.
A plants environment affects the
rate of transpiration:
 light intensity
 temperature
 air movement (wind).
 humidity (amount of moisture in the air)
Why does transpiration rate vary?
For each slide note down how these factors affect the
rate of transpiration.
Task
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Complete worksheet B4c5 -Plants and their locations
Leaf A is a normal leaf.
Leaf B is a grass leaf because it has stomata on
both surfaces; there are no upper and lower
surfaces in a leaf that grows vertically.
Leaf C is a water lily leaf because it has stomata on
the upper surface; if they were in the lower
surface the leaf would become water logged and
unable to transpire.
Leaf D is a cactus leaf because it is shaped as a
spine and has few stomata to reduce water loss.
Leaf E is a heather leaf because it has sunken
stomata to reduce water loss.
Leaf F is a Marram grass leaf because it has special
adaptations to reduce water loss, i.e. curled
leaves, hairs to trap moisture.
Plenary
Transport in plants
Learning objectives
Success criteria
Students should understand :
 Describe and explain
the factors that affect
the transpiration rate.
 the effects of different
conditions on the rate of
transpiration
 Understand how some
species are adapted to
reduce water loss by
transpiration.
 be able to describe how
this can be measured in
experiments
 relate plant structure to
environmental conditions