TASK 1
1. Use the cut out pieces to label the two diagrams.
2. Place the correct definition with the correct labelled part.
3. Describe the structure of a chloroplast using the given starter sentences.
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X is surrounded by…
Inside X is..
Each of the X that makes up Y is called a …….
X is the site for the Y reactions in which Z is converted to…
As the X reactions proceed, the inside of Y develop
Stroma
Grana
Outer membrane
Inner membrane
Thylakoid
Plastid
Fluid where organic molecules like glucose are
synthesizes using CO2 and other reactants.
Stacks of disc-shaped membranes filled with
proteins and pigments that allow the light-dependent
phase of photosynthesis to occur
A permeable membrane that allows small molecules
to freely pass through
A selectively permeable membrane that is
impermeable to ions and metabolites; Active
transport is main means of transport
Disc shaped membrane filled with pigments that
allow the light-dependent phase of photosynthesis to
occur
Plant cell organelle containing pigments for light
phase of photosynthesis
Membranous connections between grana.
Lamella
Ribosomes
Sites where enzymes and other proteins needed for
photosynthesis is synthesized(made)
Used for repairing phospholipid bilayer membranes
Lipid droplet
TASK 2
2.1
Below are diagrams showing and experiment conducted by Jan Ingenhousz many years ago. Complete
and colour in the test tubes on the right to show the expected result after 48 hours in the light.
1. Explain the result: …………………………………………………………………………………………
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2.2 Below is the structural formulae for parts of hemoglobin and chlorophyll. Name at least three differences
between haemoglobin and chlorophyll.
TASK 3
The graph below shows the absorption spectrum for two types of chlorophyll molecules.
How does Chlorophyl a differ from Chlorophyl b according to the absorption spectrum? ________________
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TASK 3
Use the text on the left to create a mind map on the right.
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+
→
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→
TASK 4
Use the text below to fill in the missing information in the diagram.
Chlorophyll molecules are situated along protein complexes called photosystems I and II. As it absorbs the light energy, it sets off a
reaction of linear electron flow, passing of an electron through pigment molecules. Light first strikes a pigment molecule and the energy
travels to the reaction-centre complex of the photosystem II (PS680). There, a special pair of chlorophyll molecules pushes out an
electron to the primary acceptor of photosystem II. The resulting pair of special pigment molecules is a PS680+, the strongest biological
oxidizing agent known. In order to fill up the missing electron, an enzyme catalyses a water molecule into an oxygen atom (which
immediately combines with another oxygen atom and is given off), protons (pumped into the thylakoid lumen), and electrons, send one
by one to replace the missing PS680+ ones.
Once passed to the primary acceptor, electrons are sent via a chain of electron carries (similar to those in cellular respiration) to the
photosystem I. During the electron chain stage protons are pumped into the thylakoid lumen, providing proton-motive force for
chemiosmotic synthesis of ATPvia ATP synthase.
Meanwhile, in the photosystem I, energy again is passed through chlorophyll molecules into another reaction centre complex (PS700,
the reaction centre of photosystem I), which pushes an electron to the primary acceptor of the photosystem I, resulting in PS700+. This
PS700+ complex can now act as an electron receptor for the electrons coming from photosystem II.
From the primary acceptor of the photosystem I, electrons pass through another electron carrier chain (but with no protons and thus
ATP generated). At the end of the chain, the enzyme NADP+ reductase catalyses a reduction of NADP+ to NADPH. The reaction
requires two electrons from the linear electron flow, and one proton from the stroma, (NADP+ is very similar to NAD+ present in
cellular respiration).
The NADPH and ATP generated during the light reactions phase are used in the Calvin cycle to synthesize sugar.
2.
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9
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5.
3
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3
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3
3
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3
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8.
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10.