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MYP Biology Unit 3 		Name: ___________________________ Block: ____ Assignment #:_______
Photosynthesis
1.	(a)	State the location in the chloroplast of the following reactions of photosynthesis.
Light-independent reactions: .......................................................................................
Light-dependent reactions: ..........................................................................................
(2)
(b)	Explain what happens in the light-dependent and light-independent reactions of photosynthesis.
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(3)
2.	(a)	Explain why carbon dioxide concentration is a limiting factor of photosynthesis.
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 (2)
(b)	Explain the relationship between the structure of the chloroplast and its function.
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(3)
(c)	State chemical equation of photosynthesis. 
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(1)
3.	Draw a labelled diagram of a chloroplast and include any process which occur inside the chloroplast.

(4)

4.	(a)	State the main photosynthetic pigment in plants.
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(1)
	(b)	Define photosynthesis. 
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(1)
	(c)	State two factors which effect photosynthesis. 
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(2)
_____5.	Where are the light-dependent and light-independent reactions taking place in the diagram below?

| Light-dependent | Light-independent
A. | I | IV
B. | II | III
C. | III | II
D. | IV | I
_____6.	Which type of light is least useful for photosynthesis in terrestrial plants?
A.	Blue
B.	Green
C.	White
D.	Red
_____7.	Where is chlorophyll found in a plant cell?
A.	Thylakoid membranes
B.	Stroma
C.	Matrix
D.	Cristae

Biology 9: Unit 3 Practice #1		 
1.	(a)	light-independent reactions: stroma;
light-dependent reactions: thylakoid / grana;	2
 
(b)	absorb photons of light / photoactivation;
raised to a higher energetic level;
pass from molecule to molecule;
drop back to own level emitting energy;	3 max
[5]
2.	(a)	photosynthetic rate rises as CO_2 concentration rises;
up to a maximum when rate levels off / labelled graph showing outline
of relationship;
at high levels of CO_2 other factors become limiting;
	CO_2 levels most important determinant of photosynthetic rate / rate limiting
factor;
stomata need to close to prevent water loss, which prevents CO_2 uptake;	3 max
 
(b)	large surface area for light absorption;
small space inside thylakoids for accumulation of protons;
fluid stroma for the enzymes of the Calvin cycle;	3
 
(c)	ATP and NADPH + H^+ / NADPH_2	2
[8]

MYP Biology Unit 3 		Name: ___________________________ Block: ____ Assignment #:_______
Cell Respiration
1.	(a)	Draw a labelled diagram of a mitochondrion.

(3)
 
(b)	Explain how the structure of a mitochondrion is adapted for its function.
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(3)
2.	(a)	State the chemical reaction of cellular respiration.
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(1)
(b)	Outline the role of oxygen in cellular respiration.
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 (2)

3.	Compare mitochondria and chloroplast in regards to three different features. (3 points)
| Mitochondria | Chloroplast

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2.

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3.

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4.	Compare photosynthesis and cellular respiration in regards to three different features. (3 points)
| Photosynthesis | Cellular Respiration

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2.

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3.

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5.	The diagram below shows possible pathways for the breakdown of glucose in various cells.

(a)	State the names of processes.
R:	...........................................................................................................................
Q:	...........................................................................................................................
(b)	State the location in which process R takes place.........................................................................
	State the location in which process A takes place.........................................................................

Biology 9: Unit 3 Practice #2		
1.	(a)	Award [1] for each structure clearly drawn and clearly labelled.
overall circular or cylindrical shape;
smooth outer membrane and inner folded membrane shown close
together;
cristae, shown as thin folds of the inner membrane orientated
towards the inside of the mitochondrion;
matrix;
ribosomes/circular DNA;
intermembrane space;	3 max
(b)	large inner surface area of cristae for respiratory complexes/
electron transport chains;
matrix contains/encloses DNA and ribosomes for protein
(enzyme) synthesis / Krebs cycle enzymes;
(double) membrane(s) isolates metabolic processes from
the rest of the cytoplasm;
small IM space between inner and outer membranes for
accumulation of protons;	2 max
Answers must clearly link a structure to a function for a mark.
2.	(a)	inter-membrane space / outside inner membrane / between
outer and inner membrane	
(b)	in the electron transport chain;
final electron/hydrogen acceptor;
combines with H^+ (and electrons) to produce water;	2 max
(c)	cristae for increasing surface area;
small inter-membrane space for rapid build-up of concentration gradient;
matrix with chemical concentration to support unique chemical reactions;	2 max

5.	
| Mitochondria | Chloroplast

1.

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2.

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3.

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6.
| Photosynthesis | Cellular Respiration

1.

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5.	(a)	State the names of processes.
R:	aerobic
Q:	anaerobic
          (b)  R = inside mitochondria (matrix)		A= Cytoplasm

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