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Worksheets8 plants food
Total questions: 20
Worksheet time: 10mins
If you want to buy a colored light bulb for your indoor plants, the least effective color would be
red
blue
green
yellow
orange
If the hydrogen atoms of water are radioactively labeled, which products of photosynthesis, if any, will also have this radio-labeled hydrogen?
water and oxygen gas both
water only
sugar only
water and sugar both
water, sugar, and oxygen gas
Where does photosynthesis occur in eukaryotes?
plasma membrane
Golgi bodies
cytosol
mitochondria
chloroplasts
Choose the most correct statement about the two phases of photosynthesis.
The light-dependent reactions occur in the cytosol; the light-independent reactions occur in the stroma.
The products of the light-dependent reactions are ATP, NADPH, and O2; the products of the light-independent reactions are ADP, NADP+, and sugar.
The light-dependent reactions occur during the daylight hours; the light-independent reactions occur when it is dark.
The light-dependent reactions produce water as a by-product; the light-independent reactions produce carbon dioxide as a waste product.
The products of the light-dependent reactions are ADP, NADP+, and O2; the products of the light-independent reactions are ATP, NADPH, and sugar.
Fluorescence occurs when
a high-energy electron returns to its ground state by releasing energy in a photon.
a low-energy electron moves to a high-energy state by absorbing heat.
a high-energy electron leaves its nucleus and moves to a different molecule.
a pigment molecule accepts a high energy electron and releases a photon of energy
the energy from an electron is transferred to a different molecule while the electron returns to the ground state.
The molecule of chlorophyll a in photosystem II's reaction center is known as P680 because
it absorbs 680 photons per minute.
it absorbs photons with a wavelength of 680 nm.
there are exactly 680 accessory pigments in the photosystem.
it will generate 680 molecules of ATP per photon absorbed.
there are 680 electrons that can be energized by light.
In the light-dependent reactions of photosynthesis, an excited electron from photosystem II is passed along an electron transport chain to _?_.
NAD+
NADH
photosystem I
oxygen
water
The chemical structure of chlorophyll is based on a complex organic ring structure, a long hydrophobic side chain and an atom of _?_ in the center of the ring.
carbon
manganese
magnesium
iron
nitrogen
All of the following processes are associated with photosystem I EXCEPT
ATP synthesis.
NADPH synthesis.
cyclic electron flow.
accepting electrons flowing from the electron transport chain.
splitting of water.
The primary purpose of the light-dependent reactions is to
provide electrons and energy for the light-independent reactions.
generate O2 gas.
make ADP in cyclic photophosphorylation.
transfer electrons to the primary electron acceptors.
produce sugars such as glucose.
The purpose of the Calvin cycle is to
produce sugars using CO2 as a carbon source.
recover electrons lost when water was split.
capture photons of light.
counteract increasing atmospheric CO2 concentrations (global warming).
generate O2 gas for cellular respiration.
Where does the Calvin cycle occur?
thylakoid membrane
thylakoid lumen
stromal lamellae
cytosol
stroma
Which Calvin Cycle products are used in the light reactions?
G3P, ATP and NADPH
O2, water and ATP
ADP, Pi and NADP+
electrons from CO2
protons and Pi
You extract all of the proteins of a leaf and measure the percentage that is rubisco. You find that rubisco comprises what percentage of the leaf proteins?
10%
25%
50%
75%
100%
Why is photorespiration more likely in warm weather?
Plants require warm weather (at least 23 degrees C) to drive photosynthesis.
Plants are more likely to close their stomata in the daytime heat than at night when it is cool.
Plants are more likely to dehydrate in warm weather, forcing them to close the stomata to conserve water; this prevents CO2 from entering the leaf.
The rubisco enzyme is very temperature sensitive and becomes less selective in warmer temperatures, allowing it to fix O2 instead of CO2.
Plants use up the water in their central vacuoles in warm weather which inhibits the water-requiring light reactions; this in turn alters the activity of rubisco.
During which of the following time periods does a CAM plant use rubisco?
daylight only
in darkness only
noon to midnight
midnight to noon
all 24 hours of a standard calendar day
During which of the following time periods does a C4 plant use rubisco?
daylight only
in darkness only
noon to midnight
midnight to noon
all 24 hours of a standard calendar day
Where can you find ATP synthase in a plant cell?
in the thylakoid membrane
in the mitochondrial inner membrane
embedded in the plasma membrane
only in the nucleus
thylakoid and inner mitochondrial membranes
If you put chloroplasts in the dark, they can continue to make sugar if provided with
NADPH, ATP, and CO2
NADPH and ATP
CO2 and ATP
NADPH, CO2 and ADP
water and ATP
Standard photosynthesis (C3) plants are more susceptible to photorespiration than either C4 or CAM plants, so why do most plants lack the C4 pathway?
Rubisco is more efficient in C3 plants when compared to rubisco C4 and CAM plants.
Photorespiration is not a serious problem for most plants.
Most plant species do not have vacuoles in their cells to store the malate generated from CO2 taken in during the night.
There is an energetic cost to C4 and CAM pathways which only makes them advantageous in very hot and/or arid environments.
Switching between C3, C4, and CAM photosynthesis is very difficult for most plants.
