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Biology
Plants and photosynthesis
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Cards (24)
What is photosynthesis?
A series of
enzyme
controlled reactions
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What role does chlorophyll play in photosynthesis?
It absorbs
light energy
for the reaction
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What is the organ of photosynthesis in plants?
The
leaf
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Why is water important in photosynthesis?
It is
needed
for
photosynthesis
and
transport
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How does water provide support to plant cells?
By filling cells and pushing against
cell walls
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What happens to leaves when they lack water?
They become
flaccid
and wilt
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What is transpiration in plants?
Loss of water from the
stomata
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What are the four limiting factors affecting photosynthesis?
Temperature, light intensity,
CO₂
, humidity
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How is the rate of photosynthesis usually measured?
By recording the amount of
oxygen produced
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How can light intensity be investigated in photosynthesis?
By moving a
plant
closer to a light source
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What does sodium hydroxide do in photosynthesis experiments?
It absorbs
CO₂
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What happens when CO₂ levels increase in photosynthesis?
The rate of photosynthesis becomes
constant
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How can temperature be controlled in a photosynthesis experiment?
By using an
air conditioner
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What is the first step in testing a leaf for starch?
Boil
the leaf to kill it
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What indicates the presence of starch in a leaf test?
A blue/black color with
iodine
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What are the three essential minerals for plant growth mentioned?
Nitrogen
,
potassium
,
phosphates
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What growth problem is caused by nitrogen deficiency?
Poor growth
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What growth problem is caused by potassium deficiency?
Yellowing
of leaves
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What growth problem is caused by phosphate deficiency?
Poor root growth
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What factors affect the rate of photosynthesis?
Temperature
,
humidity
,
wind speed
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What
direction does xylem carry water in plants?
Up the plant
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How do root hairs assist in water absorption?
They increase the
surface area
for absorption
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What process allows water to be drawn into root cells?
Osmosis
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Why do root cells require lots of oxygen?
Because they are actively
respiring
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