BIO 311C CHAPTER 11 Exam 2026
Questions and Answers Graded A+
What are the benefits of photosynthesis to other organisms? - Correct answer-
Releases oxygen into the atmosphere. It is the primary source of organic
compounds that are essential for everything. Economically, we would have no food
or building/clothing materials to make things without photosynthesis
The primary function of light energy in photosynthesis is to
____________________ . - Correct answer-Excite electrons in the reaction center
chlorophyll
Why do plants need water? - Correct answer-it is an important donor of electrons.
Necessary for photosynthesis, to transport minerals, maintain structural rigidity and
to regulate temperature.
Why visible light (wavelength of 400 to 700 nm) alone is useful in photosynthesis
and not the high energy UV or long wavlength IR spectrucm of light? - Correct
answer-It is the optimal energy level and safe range of visible light spectrum. Also,
it is the most abundant wavelength of light
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, When does cyclic electron flow (at Photosystem I) occur instead of non-cyclic
electron flow? - Correct answer-When there is abundance of NADPH.
With a lot of NADPH, no need for non-cyclic photophosphorylation, plant can use
cyclic electron flow to make ATP
Suppose a thylakoid is somehow punctured so that the interior of the thylakoid is
no longer separated from the stroma. This damage will have the most direct effect
on which of the following processes? - Correct answer-the synthesis of ATP
With no separation, no proton gradient will be generated, so ATP synthase will not
function, inhibiting production of ATP
The action spectrum is broader than the absorption spectrum because - Correct
answer-The action spectrum is the result of all the pigments harvesting the light
energy. The absorption spectrum depicts the relative amount of light absorbed by
the individual pigments.
During photophosphorylation, the pH of the thylakoid interior will be
______________ - Correct answer-lower than the pH of stroma since protons
move into the thylakoid space.
©COPYRIGHT 2026, ALL RIGHTS RESERVED 2
Questions and Answers Graded A+
What are the benefits of photosynthesis to other organisms? - Correct answer-
Releases oxygen into the atmosphere. It is the primary source of organic
compounds that are essential for everything. Economically, we would have no food
or building/clothing materials to make things without photosynthesis
The primary function of light energy in photosynthesis is to
____________________ . - Correct answer-Excite electrons in the reaction center
chlorophyll
Why do plants need water? - Correct answer-it is an important donor of electrons.
Necessary for photosynthesis, to transport minerals, maintain structural rigidity and
to regulate temperature.
Why visible light (wavelength of 400 to 700 nm) alone is useful in photosynthesis
and not the high energy UV or long wavlength IR spectrucm of light? - Correct
answer-It is the optimal energy level and safe range of visible light spectrum. Also,
it is the most abundant wavelength of light
©COPYRIGHT 2026, ALL RIGHTS RESERVED 1
, When does cyclic electron flow (at Photosystem I) occur instead of non-cyclic
electron flow? - Correct answer-When there is abundance of NADPH.
With a lot of NADPH, no need for non-cyclic photophosphorylation, plant can use
cyclic electron flow to make ATP
Suppose a thylakoid is somehow punctured so that the interior of the thylakoid is
no longer separated from the stroma. This damage will have the most direct effect
on which of the following processes? - Correct answer-the synthesis of ATP
With no separation, no proton gradient will be generated, so ATP synthase will not
function, inhibiting production of ATP
The action spectrum is broader than the absorption spectrum because - Correct
answer-The action spectrum is the result of all the pigments harvesting the light
energy. The absorption spectrum depicts the relative amount of light absorbed by
the individual pigments.
During photophosphorylation, the pH of the thylakoid interior will be
______________ - Correct answer-lower than the pH of stroma since protons
move into the thylakoid space.
©COPYRIGHT 2026, ALL RIGHTS RESERVED 2
