22 Questions
What is the main function of sieve tube members in Angiosperm cells?
To transport sugars from source to sink
How do sugars primarily travel from the source to the sink in Angiosperm cells?
Via active transport using companion cells and sieve tube members
Where does the Dark Reaction of photosynthesis take place?
In the stroma
What is the main function of chlorophyll a and b pigments in photosynthesis?
Absorb light energy for photosynthesis
In which season do we primarily see yellow/orange/red colors in leaves due to beta keratin pigment?
Fall
Why does the Sieve tube members actively transport sugars from source to sink?
Due to water entering sieve tube members by osmosis
What is the function of the epidermis in a leaf?
To protect the leaf and control what moves in and out
What happens when light energy hits pigment molecules in photosynthesis?
Electrons in pigment molecules get excited and absorbed
Which molecules are the primary electron acceptors in the reaction center during photosynthesis?
Primary acceptors donate electrons to Fd molecules
Why is having two photosystems with different maximum absorption wavelengths beneficial for photosynthesis?
To enhance the range of light wavelengths absorbed
What is the role of NADPH in the light reactions of photosynthesis?
To accept high-energy electrons and become reduced
What do sieve tube members do in the context of plant physiology?
Transport organic compounds from source to sink
What is the main purpose of the process called chemiosmosis in photosynthesis?
To convert light energy into chemical energy
In the Calvin cycle, what is the role of RUBISCO?
Grab CO2 and bind them to 6 RUBP molecules
Why do C3 plants experience a decrease in photosynthesis rate when there is an abundance of oxygen?
RUBISCO prefers O2 over CO2
What is the main reason C4 plants have evolved separate pathways for carbon fixation?
To avoid binding of oxygen by RUBISCO
Which pathway involves fixing CO2 at night and storing it for use during the day to minimize water loss?
CAM pathway
In cellular respiration, where does glycolysis occur?
Cytoplasm
Which process involves oxidative phosphorylation and substrate-level phosphorylation to produce ATP?
Krebs cycle
What is the primary function of the Electron Transport Chain (ETC) in cellular respiration?
Produce ATP through redox reactions
Which organelle has cristae that increase surface area for cell respiration to occur?
Mitochondrion
What happens when electrons move down the Electron Transport Chain (ETC)?
Energy is used to create a concentration gradient of H+ ions
Test your knowledge on Photosystem I, photophosphorylation, and chemiosmosis in the process of ATP production during photosynthesis. Understand how electron transport chain generates a concentration gradient of H+ ions to produce ATP.
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