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paper 1
B2
organisation in plants
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Created by
Jade cookson
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Cards (35)
Why is a leaf considered an organ?
Many
tissues
work together for
photosynthesis
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How is the upper epidermis adapted for its function?
Transparent cells
allow
light
to
pass
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How is the palisade mesophyll adapted for its function?
Tightly packed cells absorb light for
photosynthesis
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How is the spongy mesophyll adapted for its function?
Air spaces increase
surface area
and allow
diffusion
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What is the function of the guard cells?
Control the opening/closing of the
stomata
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What is the function of the xylem?
Transport water and
mineral
ions
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How are xylem cells adapted to their function?
Made of
dead cells
, no
end walls
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What strengthens the xylem cell walls?
Lignin
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What is the function of the phloem?
Transport dissolved
sugars
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What is the purpose of translocation?
Transport dissolved
sugars
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What is transpiration?
Loss of water from the
leaf
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What are plant walls made of?
Dead
cells
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What isn't found between plant cells?
End wall
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What chemical strengthens plant cell walls?
Lignin
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What does lignin enable plant cell walls to withstand?
Water pressure
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What is transported from the leaves to the rest of the plant?
Dissolved sugars
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Where are dissolved sugars transported from the leaves?
Other parts of the
plant
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What processes do plants use dissolved sugars for?
Respiration
,
growth
, and
storage
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What moves water from the roots to the leaves?
Xylem
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What does water provide to keep plant cells turgid?
Keeps
cells
turgid
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What does water provide for photosynthesis?
Water
for
photosynthesis
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What does the xylem transport to the leaves?
Mineral ions
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What environmental factors affect the rate of transpiration?
Temperature
Light intensity
Humidity
Wind speed
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How do higher temperatures affect the rate of transpiration?
Increase
the
rate
of
transpiration
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How do higher humidity levels affect the rate of transpiration?
Decrease
the
rate
of
transpiration
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Why do stomata open wider?
To let
more
carbon dioxide
in
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What process is aided by the entry of carbon dioxide into the leaf?
Photosynthesis
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What do open stomata allow?
Diffusion
of
gases
in
and
out
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Where are stomata primarily located on leaves?
Underside
of
leaves
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What is reduced by the stomata location on the underside of leaves?
Water
loss
through
evaporation
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What is transpiration measured by?
Change in mass
of a plant
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What is transpiration measured by?
Volume of water
absorbed by plant
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What instrument is used to determine the rate of transpiration?
A
potometer
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What does a potometer measure to determine the rate of transpiration?
Volume of water absorbed
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How can the volume of water absorbed be calculated using a potometer?
Measuring the
distance
traveled by air
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