60 Questions
What is the primary source of energy for life on earth?
Energy derived from the sun
What is the annual rate of sugar fixation through photosynthesis?
250 billion tonnes
What is the byproduct of photosynthesis that is responsible for the rise of atmospheric oxygen?
O2
What is the primary source of food for humans and animals?
Plants only
What is the process by which organisms can harvest energy from the sun?
Photosynthesis
What is the source of the therapeutic drug aspirin?
Bark of willow trees
What is the term for the process by which organisms can survive for extended periods without eating?
Endosymbiosis
What is the key component of the light reactions in photosynthesis?
All of the above
What is the pigment responsible for absorbing light that powers photosynthesis?
Chlorophyll a
What is the organelle in which photosynthesis takes place?
Chloroplast
What is the primary function of the proton gradient in photosynthesis?
To drive the ATP synthase to generate ATP
What is the purpose of switching photosystem 1 into cyclic mode?
To generate more ATP without producing NADPH
What is the significance of cyclic photophosphorylation in C4 plants?
It provides an ATP source in the bundle sheath chloroplasts
What is the primary function of rubisco in photosynthesis?
To fix carbon dioxide
What is the consequence of rubisco fixing oxygen instead of carbon dioxide?
Photorespiration
What is the role of malate or aspartate in C4 plants?
To shuttle CO2 from mesophyll cells to bundle sheath cells
What is the characteristic of CAM plants that helps them conserve water?
Closed stomata during the day
What is the function of carbonic anhydrases in algae?
To facilitate inorganic carbon uptake
What is the primary difference between C4 and CAM plants?
C4 plants shuttle CO2, while CAM plants store CO2 as malic acid
What is the result of the electron transport chain in photosynthesis?
Production of oxygen
What is the role of carotenoids in photosynthesis?
To pass absorbed light energy to chlorophyll a and provide photo protection
What is the result of the oxygen evolving complex catalysing the splitting of two water molecules?
H2O = H+ + O2 + 4E-
What is the process by which PS1 can generate more ATP without producing NADPH?
Cyclic electron flow
What is the primary function of the proton gradient in photosynthesis?
To drive the ATP synthase to generate ATP
What is the purpose of the electron transport chain in photosynthesis?
To generate ATP and NADPH
What is the type of photosynthesis used by some C4 plants?
C4 pathway
What is the net equation of photosynthesis?
CO2 + H2O = CHO + O2
What is the result of rubisco fixing oxygen instead of carbon dioxide?
Photorespiration
What is the process by which algae take up inorganic carbon?
Inorganic carbon uptake system
What is the role of chlorophyll a in photosynthesis?
To absorb light energy and power photosynthesis
What is the primary role of photosynthesis in the global carbon cycle?
To fix carbon dioxide into organic compounds
What is the annual rate of sugar fixation by photosynthesis?
250 billion tonnes
Which of the following organisms is an example of endosymbiosis?
Green marine sea slugs
What is the primary source of energy for the production of therapeutic drugs such as Vinblastine and Vincristine?
Plants
What is the byproduct of photosynthesis that is responsible for the rise of atmospheric oxygen?
Oxygen
What is the key component of the light reactions that absorbs light energy?
Pigments
What is the primary function of the chloroplast in photosynthesis?
To absorb light energy
What is the role of photosynthesis in the production of food for humans and animals?
To produce glucose
What is the consequence of the rise of atmospheric oxygen due to photosynthesis?
The possibility of aerobic respiration
What is the primary function of photosynthesis in the ecosystem?
To provide energy for living organisms
What is the energy fate that involves the transfer of energy from a negative charged high-energy electron to another nearby molecule?
Transferring energy from a negative charged high-energy electron to another nearby molecule
What is the pigment that absorbs light in the blue-violet range, passes absorbed light energy to chlorophyll a, and provides photo protection?
Carotenoids
What is the process by which the proton gradient drives the ATP synthase to generate ATP?
Electron transport chain
What is the function of the oxygen evolving complex in photosynthesis?
Catalysing the splitting of two water molecules
What is the term for the process by which some organisms can survive for extended periods without eating?
Kleptoplasty
What is the source of energy for life on earth?
Photosynthesis
What is the pigment responsible for absorbing light that powers photosynthesis in plants, algae, and cyanobacteria?
Chlorophyll a
What is the byproduct of photosynthesis that is responsible for the rise of atmospheric oxygen?
O2
What is the process by which organisms can harvest energy from the sun?
Photosynthesis
What is the organelle in which photosynthesis takes place?
Chloroplast
What is the primary role of the proton gradient in photosynthesis?
To drive the ATP synthase to generate ATP
What is the outcome of the coupling of PS2 and PS1?
Boosting of electrons to produce NADPH
What is the significance of cyclic photophosphorylation in C4 plants?
It generates ATP
What is the result of rubisco fixing oxygen instead of carbon dioxide?
Photorespiration
What is the role of carbonic anhydrases in algae?
To facilitate inorganic carbon uptake
What is the primary function of malate or aspartate in C4 plants?
To shuttle CO2 from mesophyll cells to bundle sheath cells
What is the characteristic of CAM plants that helps them conserve water?
Stomata remain shut during the day
What is the primary difference between C4 and CAM plants?
C4 plants have a different mechanism of CO2 fixation
What is the outcome of the electron transport chain in photosynthesis?
Generation of ATP
What is the role of the proton gradient in cyclic electron flow?
To generate ATP
Explore the crucial role of photosynthesis in supporting life on Earth, from producing oxygen to fueling the global carbon cycle. Learn how it affects our food and energy sources. Test your knowledge of this vital biological process!
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