Photosynthesis Chemistry Worksheet With Answer Key Page 3
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Answer Key
Date:
Period:
8.2/C4 Photosynthesis
8.
Photosynthesis consists of two stages: light dependent and light independent reactions.
a. Define photolysis
The splitting of H
O into electrons (replace electrons in photosystem II)
2
hydrogen ions (used in chemiosmosis to produce ATP) and oxygen (which leaves as product)
using energy from the sunlight.
b. Define photophosphorylation
The production of ATP using energy from photons, the
+
electron transport chain and chemiosmosis, which produces a concentration gradient of H
that power
ATP synthase.
c. Define carbon fixation
The conversion of inorganic carbon dioxide into an organic molecule.
This happens in photosynthesis by combining RuBP with CO
using the enzyme rubisco in the calvin
2
cycle.
9.
Annotate the diagram below to explain the light-dependent reactions of photosynthesis.
Include photolysis, photophosphorylation (and chemiosmosis), movement of electrons,
+
+
generation of a H
gradient using a proton pump, reduction of NADP
by ferredoxin.
Sunlight
+
H
+
H
-
NADP Reductase
e
-
e
-
e
-
e
+
-
H
+ O
+ e
2
+
H
+
H
+
+
H
H
H
O
+
2
H
+
H
H
+
H
+
H
Chlorophyll molecules in photosystem II absorb photons and transfer the energy to electrons, which then jump to
the primary electron acceptor and pass through an electron transport chain to photosystem I. As they move,
+
H
chemiosmosis occurs, which is when hydrogen ions are pumped into the lumen where a concentration gradient is
+
H
created. The hydrogen ions then move down the gradient into the stroma through ATP synthase. As they pass
+
through ATP synthase, ADP is combined with phosphorus to make ATP. This is photophosphorylation. In
photosystem I, photons are absorbed again and transferred to ferrodoxin, NADP reductase then uses the electrons
+
to reduce NADP
to form NADPH. Photolysis occurs when water is split, using energy from sunlight, into electrons,
hydrogen, and oxygen. The electrons replace the electrons that were lost in photosystem II.
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