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bioenergetics
photosynthesis
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Created by
Millie Rosbon
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Cards (35)
What type of organisms are plants classified as in terms of food production?
Autotrophs
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Why are plants referred to as producers in food chains?
Because they can make their own food using light, water, and
carbon dioxide
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What type of reaction is photosynthesis classified as?
Endothermic reaction
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Where does most photosynthesis take place in a plant?
In the leaves, specifically in specialized
mesophyll
cells
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What is the role of chlorophyll in photosynthesis?
To absorb
light
energy
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What are the products of photosynthesis used for in plants?
To make all substances a plant needs and for
respiration
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What is the word equation for photosynthesis?
Carbon dioxide
+ Water →
Glucose
+
Oxygen
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What is the balanced symbol equation for photosynthesis?
\( 6CO_2 + 6H_2O \rightarrow
C_6H_{12}O_6
+ 6O_2 \)
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How do plants obtain the materials needed for photosynthesis?
From the
environment
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Why is photosynthesis essential for food chains on Earth?
It is the
primary source
of energy for most food chains
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What are the three main factors that a plant needs to photosynthesize?
Light, water, and
carbon dioxide
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How does the availability of light affect the rate of photosynthesis?
More
light
increases
the rate of photosynthesis
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Why is water not considered a limiting factor for photosynthesis?
Because the amount needed is relatively small compared to
transpiration
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What environmental factors can affect the rate of photosynthesis?
Temperature and the amount of
chlorophyll
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How does temperature affect the kinetic energy of particles in photosynthesis?
Higher temperatures increase kinetic energy, leading to more
collisions
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What happens to enzymes at higher temperatures during photosynthesis?
They can be
denatured
, reducing the overall rate of photosynthesis
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How does light intensity affect the rate of photosynthesis?
More light increases the rate until another factor becomes
limiting
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What occurs at low light intensities regarding the rate of photosynthesis?
Increasing
light intensity initially increases the rate of photosynthesis
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How does carbon dioxide concentration affect photosynthesis?
More carbon dioxide
increases
the rate of photosynthesis
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What factors can affect the amount of chlorophyll in plants?
Diseases
, lack of
nutrients
, and loss of leaves
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What are the interactions of limiting factors in photosynthesis?
More than one limiting factor can affect the rate of photosynthesis
Rate increases with light intensity, temperature, and
carbon dioxide
Limiting factors can change as conditions vary
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What does the inverse square law state about light intensity and distance?
As distance
increases
, light intensity
decreases
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How does the inverse square law relate to light intensity when the distance doubles?
The light intensity decreases to
one-fourth
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What is the formula to calculate light intensity based on distance?
Light intensity = \( \frac{1}{
d^2
} \)
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If a plant is 30 cm from a lamp, what is the light intensity?
Light intensity = \( \frac{1}{30^2} =
0.001
\)
au
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Why do commercial horticulturists use greenhouses?
To control
limiting factors
of
photosynthesis
To maximize crop yield and profit
To manage costs effectively
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What are the benefits of growing plants in a greenhouse?
Increased
yield
and more frequent harvesting
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What is the aim of investigating the effect of light intensity on the rate of photosynthesis?
To measure the volume of
oxygen produced
by
aquatic organisms
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What is the most common method to measure the rate of photosynthesis?
Measuring the
oxygen
released
from aquatic plants
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What should be done to improve the accuracy of measuring oxygen production in photosynthesis experiments?
Use a
gas syringe
to collect the volume of gas produced
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What are the main uses of glucose produced in photosynthesis?
Used for
respiration
Converted into
insoluble starch
for storage
Used to produce fat or oil for storage
Used to produce
cellulose
for cell wall strength
Combined with nitrate ions to produce
amino acids
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How can starch be tested in a leaf to show photosynthesis has occurred?
By using
iodine solution
to test for the presence of starch
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What does a positive starch test indicate about a plant?
That
photosynthesis
has been taking place
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When do plants photosynthesize?
During the
day
if conditions are right
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When do plants always respire?
Plants always respire to release
energy
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