30 Questions
Where does the O2 produced by photosynthesis come from?
H2O
Which pigment plays a central role in converting solar energy into chemical energy during photosynthesis?
Chlorophyll
In which cells are chloroplasts concentrated in a plant leaf?
Mesophyll cells
What is the primary function of stomata in a plant leaf?
Allow CO2 to enter and O2 to exit
Which process occurs in chloroplasts and converts light energy into chemical energy?
Photosynthesis
What was the misconception regarding the source of O2 in photosynthesis before research using 18O?
O2 came from CO2
What is the main difference between autotrophs and heterotrophs?
Autotrophs produce organic molecules from inorganic sources, while heterotrophs obtain organic material from other organisms.
Which process directly contributes to the availability of atmospheric oxygen?
Photosynthesis
Why do almost all heterotrophs, including humans, depend on photoautotrophs for food?
Heterotrophs cannot produce their own food through photosynthesis like autotrophs.
How does photosynthesis contribute to the living world beyond just feeding plants?
Photosynthesis produces O2 that supports other metabolic processes.
In which organisms does the process of photosynthesis occur?
Plants, algae, some prokaryotes, and certain other unicellular eukaryotes
How did scientists use isotopes to determine the source of the oxygen produced during photosynthesis?
By tracking the movement of oxygen isotopes in water and carbon dioxide during photosynthesis.
Which process is an essential process not only for plants but for all life forms of the biosphere?
Photosynthesis
During photosynthesis, what is reduced to sugar?
CO2
What is the overall chemical change during cellular respiration?
Sugar is oxidized, and O2 is reduced to form H2O
Where does cellular respiration take place in eukaryotic cells?
Mitochondria
Which of the following statements is true about the energy sources for life?
Photosynthesis captures energy from the sun for life processes
What process captures some of the released energy to make ATP in cells?
Cellular respiration
Which pigment absorbs mainly blue-violet and red light?
Chlorophyll a
What is the role of carotenoids in photosynthesis?
Broaden the spectrum used for photosynthesis
Which process converts light energy into chemical energy?
Photosynthesis
Where are ATP and NADPH produced in photosynthesis?
Thylakoid membrane facing the stroma
What is the importance of carotenoids in photosynthesis?
Absorb and dissipate excessive light energy
What property of a chloroplast integrates the two stages of photosynthesis?
Structural organization
Where are chlorophyll molecules built into in a chloroplast?
Thylakoid membrane
Which part of photosynthesis involves the conversion of solar energy into chemical energy?
Light Reactions
What is the by-product of the water-splitting process in the Light Reactions of photosynthesis?
Oxygen
Where does the Calvin Cycle take place within a chloroplast?
Stroma
What is the main function of ATP in photosynthesis?
Converting solar energy to chemical energy
In photosynthesis, what provides a source of electrons and protons as well as gives off oxygen as a by-product?
Water splitting
Learn about the process of photosynthesis and cellular respiration, essential for all life forms on Earth. Understand how plants and other photosynthesizers produce food and oxygen, as well as how cellular respiration helps harvest energy from glucose. Explore the concepts of oxidation, reduction, and the exchange of gases involved in these vital processes.
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