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Revision Test
1.
Which of the following factors will not affect the rate of photosynthesis in plants?
A. temperature
B. light intensity
C. height of the plant
D. carbon dioxide concentration
□
2.
Which of the following is not produced in Calvin cycle?
A. ADP
B. glycerate-3-phosphate
C. triose phosphate
D. NADPH
3.
Fresh Hydrilla is allowed to carry out photosynthesis. Gas bubbles are released from the Hydrilla. Which of the following
shows the identity of the gas and its test?
□
Gas
Test
A.
hydrogen
burns with a ‘pop’ sound
B.
hydrogen
relights a glowing splint
C.
oxygen
burns with a ‘pop’ sound
D.
oxygen
relights a glowing splint
□
The diagram below shows the transverse section of a leaf.
P
R
S
4.
Q
Which of the following combinations correctly identifies P, Q, R and S?
A.
P
Q
R
S
spongy mesophyll
palisade mesophyll
xylem
phloem
B.
palisade mesophyll
spongy mesophyll
phloem
xylem
C.
palisade mesophyll
spongy mesophyll
xylem
phloem
palisade mesophyll
phloem
xylem
D.
spongy mesophyll
□
5.
Which of the following organisms cannot carry out photosynthesis?
A. algae
B. fungi
C. mosses
D. ferns
□
6.
How does the feature of transparent cuticle of a leaf adapt to photosynthesis?
A. Light can be reflected by the transparent cuticle.
B. Light can penetrate into the photosynthetic cells.
C. Water and gases can easily diffuse into and out of the mesophyll cells.
D. Less water is lost from the leaf and can be utilised in photosynthesis.
□
7.
Where does Calvin cycle take place?
A. stroma of the chloroplasts
B. the inner membrane of the mitochondria
C. thylakoid of the chloroplasts
D. the cytoplasm
□
8.
X is produced in photosynthesis; it is converted to Y for storage in the leaves. What is X and Y respectively?
X
Y
A.
Sucrose
starch
B.
Glucose
sucrose
C.
Glucose
starch
D.
Starch
sucrose
□
9.
In Calvin cycle, what is/are needed to reduce glycerate-3-phophate to triose phosphate?
(1)
(2)
(3)
ATP
NADPH
NADP
A.
B.
C.
D.
(1) only
(1) and (2) only
(1) and (3) only
(1), (2) and (3)
□
10.
Which of the following are the compounds produced from triose phosphate and glycerate-3-phosphate respectively?
Triose phosphate
Glycerate-3-phosphate
A.
glucose
glycerol
B.
glycerol
amino acids
C.
fatty acids
glucose
D.
amino acids
fatty acids
□
11.
Starch in leaves can be converted into M and is transported away from the leaves through N. What are M and N
respectively?
M
N
A.
sucrose
xylem
B.
glucose
phloem
C.
sucrose
phloem
D.
glucose
xylem
□
12.
Which of the following is the function of the guard cells?
A.
B.
C.
D.
They regulate the amount of gases passing through the stomata.
They allow more light to penetrate into the photosynthetic cells.
They protect the leaves against microbial infection.
They transport sugar away from the leaves.
□
13.
Curve A represents the rate of photosynthesis with certain carbon dioxide concentration at different light intensity.
curve A
rate of
photosynthesis
light intensity
Which of the following graphs best represents the rate of photosynthesis in higher carbon dioxide concentration?
A.
curve A
rate of
photosynthesis
higher carbon dioxide
concentration
light intensity
B.
curve A
rate of
photosynthesis
higher carbon dioxide
concentration
light intensity
C.
higher carbon dioxide
concentration
curve A
rate of
photosynthesis
light intensity
D.
higher carbon dioxide
concentration
curve A
rate of
photosynthesis
light intensity
14. Which of the following can be formed when glycerate-3-phosphate combines with nitrate ions?
A.
amino acids
B.
fatty acids
C.
glycerol
D.
sucrose
□
15. Most plants are green in colour. Which of the following is the best explanation for this?
A. Green light is reflected as it is the least effective for photosynthesis.
B. Chloroplasts are green in colour.
C. Plants are green in order to absorb more green light for photosynthesis.
D. Chlorophyll does not absorb green light.
□
16. Which of the following statements is incorrect?
A.
Variegated leaves can carry out photosynthesis because chlorophyll is still present in some parts of the leaves.
B. The rate of photosynthesis is different under different wavelengths of light.
C. The yellowing of leaves in autumn is caused by the breakdown of chlorophyll.
D. Carotenoids are photosynthetic pigments that absorb mostly red and blue light.
□
17.
Which of the following leaf cells have no chlorophyll?
(1)
upper epidermal cell
(2)
lower epidermal cell
(3)
xylem cell
(4)
guard cell
A.
(1) and (2) only
B.
(1), (2) and (3) only
C.
(1), (2) and (4) only
D.
(2), (3) and (4) only
□
18. Which of the following statements about photosynthesis is correct?
A. Photosynthesis helps maintain the balance between oxygen and carbon dioxide in the atmoshpere.
B. Energy derived from photosynthesis is released in the form of heat and ATP.
C. Photosynthesis is the only form of autotrophic nutrition.
D. Photosynthesis is the only source of food for all terrestrial plants.
□
Directions: Questions (19) to (21) refer to the diagram below which shows a transverse-section of a leaf.
1
2
3
4
5
6
9
7
8
19. Which of the above structures contain chloroplasts?
A.
2 and 3 only
B.
1, 2 and 3 only
C.
D.
2, 3 and 6 only
2, 3 and 8 only
□
20. Photosynthesis occurs mostly in structure
A.
1.
B.
2.
C.
3.
D.
6.
□
21. Which of the following gases pass out of the leaf through structure 7 during the day?
(1)
oxygen
(2)
carbon dioxide
(3)
water vapour
A.
(1) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
□
22.
During photosynthesis, X is converted to Y which is stored in the form of Z. Which of the following shows the correct
names of X, Y and Z?
X
Y
Z
A.
chemical energy
light energy
starch
B.
heat energy
chemical energy
glycogen
C.
light energy
heat energy
cellulose
D.
light energy
chemical energy
starch
□
23. During photosynthesis, a green plant uses
A.
carbon dioxide and oxygen to produce sugars and water in sunlight.
B.
water and oxygen to produce sugars and carbon dioxide in sunlight.
C.
water and carbon dioxide to produce sugars and oxygen in sunlight.
D.
oxygen and carbon dioxide to produce starch in sunlight.
□
24. Which of the following substances is not the reactant in photosynthesis?
A.
water
B.
chlorophyll
C.
carbon dioxide
D.
oxygen
□
25.
The diagrams below show two experiments.
Experiment X
18O
2
(‘heavy’ oxygen)
H218O (‘heavy’ water) +
CO2 (normal carbon dioxide) +
algal suspension
Experiment Y
O2 (normal oxygen)
H2O (normal water) +
C18O2 (‘heavy’ carbon dioxide) +
algal suspension
These two experiments suggest that the oxygen evolved during photosynthesis comes from
A.
the glucose synthesised.
B.
chlorophyll.
C.
water.
D.
carbon dioxide.
□
26. In the Calvin cycle, glycerate-3-phosphate (GP) is produced. Which of the following is not directly synthesised from GP?
A.
triose phosphate
B.
amino acids
C.
fatty acids
D.
glycerol
□
Directions: Questions (27) to (29) refer to an experiment. When a green leaf is tested for starch, the following steps are
involved.
27.
(1)
Add a few drops of iodine solution to the discs.
(2)
Punch the discs out of the leaf with a cork borer.
(3)
Heat the discs in ethanol.
(4)
Soften the discs in hot water.
(5)
Put the discs in boiling water for three minutes.
The correct sequence of the steps is
A.
(1)  (3)  (2)  (5)  (4)
B.
(2)  (5)  (3)  (4)  (1)
C.
(2)  (4)  (1)  (3)  (5)
D.
(3)  (4)  (2)  (1)  (5)
□
28.
Which of the following are the correct reasons for carrying out steps 3 and 5 respectively?
Step 3
Step 5
A.
to remove chlorophyll
to dissolve the waxy cuticle
B.
to wash away iodine solution
to remove chlorophyll
C.
to kill cells and stop chemical reactions
to remove chlorophyll
D.
to remove chlorophyll
to kill cells and stop chemical reactions
□
29.
When boiling the discs in ethanol, it is advised to heat the ethanol in a hot water bath instead of heating it directly in order
to avoid
A.
destroying the iodine solution.
B.
cracking of the test tube.
C.
the ethanol vapour from catching fire.
D.
damage to the chlorophyll.
□
Directions: Questions (30) to (f) refer to the diagram below which shows the process of photosynthesis.
P
S
R
light energy
Q
to atmosphere
light
dependent
stage
Calvin cycle
T
to cytoplasm
The rectangle represents the site in a cell where photosynthesis occurs. P, Q, R, S and T are substances involved in
photosynthesis.
30. Which of the following does the rectangle represent?
A.
cell wall
B.
cell membrane
C.
cytoplasm
D.
chloroplast
□
31. Substances P and S are, respectively,
A.
chlorophyll and water.
B.
water and carbon dioxide.
C.
carbon dioxide and oxygen.
D.
oxygen and chlorophyll.
□
32.
Which of the following correctly shows the sources of substances P and S?
Substance P
Substance S
A.
from the air
from the soil
B.
from the air
from the air
C.
from the soil
from the air
D.
from transpiration
from respiration
□
33. Substances Q and T are, respectively,
A.
oxygen and sugars.
B.
carbon dioxide and starch.
C.
carbon dioxide and water.
D.
oxygen and water.
□
34. Substances R include
(1)
ATP.
(2)
NADPH.
(3)
hydroxyl ion.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and(3) only
D.
(1), (2) and (3)
□
35. Which of the following about the process of photosynthesis is correct?
A.
In the photochemical reactions, raw material P is split into Q and R, and then R is used in the Calvin cycle.
B.
During photosynthesis, P and S combine together to form R which is then split into Q and T.
C.
In the photochemical reactions, P is either converted into R for the Calvin cycle or into Q.
D.
In the Calvin cycle, R acts as an enzyme to speed up the conversion of S to T.
□
36.
A photosynthesising plant was provided with 14C-labelled carbon dioxide. After a certain period of time, the 14C was
found in carbohydrates in the leaves of the plant. This experiment shows that
A.
carbon dioxide is necessary for photosynthesis.
B.
carbohydrates are formed during photosynthesis.
C.
plants need 14C-labelled carbon dioxide to produce carbohydrates during photosynthesis.
D.
the carbon in the carbohydrates produced during photosynthesis comes from carbon dioxide.
□
Directions: Questions (37) and (38) refer to the graph below which shows the rate of photosynthesis of green plants in different
wavelengths of light.
37.
Which types of light are the most effective for photosynthesis?
A.
violet and blue lights
B.
blue and red lights
C.
violet and green lights
D.
green and red lights
□
38.
If only green light could reach the earth, which of the following would happen?
A.
The amount of carbon dioxide in the air would decrease.
B.
The amount of food available for other organisms would decrease.
C.
The amount of oxygen in the air would increase.
D.
The mean temperature of the earth would decrease.
□
39.
A farmer constructed greenhouses with glass windows of different colours. Two weeks later, he found that the plants
inside one of the greenhouse showed poor growth and had yellow leaves. What is the colour of glass windows of this
greenhouse?
A.
Red
B.
Blue
C.
D.
Green
Colourless
□
40. Which of the following processes occurs in the Calvin cycle?
A.
ATP is produced in the mitochondria.
B.
Hydrogen is released from water during photolysis.
C.
Energy is released by chlorophyll.
D.
Glucose molecules are synthesised.
□
Directions: Questions (41) to (42) refer to the diagram below which shows an experiment to study the rate of photosynthesis of
Hydrilla.
oil
light
Hydrilla
sodium hydrogencarbonate
solution, with colourless indicator
added (which changes to red
when the level of oxygen is high)
distance (D)
41. What was the main use of sodium hydrogencarbonate solution?
A.
It provided an optimum pH for the growth of the plant.
B.
It provided enough carbon dioxide for photosynthesis of the plant.
C.
It acted as hydrogencarbonate indicator to detect carbon dioxide.
D.
It provided sodium ions for the growth of the plant.
□
42. What was the purpose of adding a layer of oil on top of the solution?
A.
It prevented the entry of bacteria and fungi.
B.
It prevented atmospheric oxygen from dissolving into the solution.
C.
It prevented the escape of oxygen.
D.
It prevented the evaporation of water.
□
Directions: Questions (43) and (44) refer to the experimental set-up below which is used to demonstrate the need of carbon dioxide
for photosynthesis.
sun
air in
P
glass
bottle
Q
air out
Y
X
boiling
boiling
tube with tube with
liquid Y
liquid X
43.
What were liquid X and liquid Y, respectively?
Liquid X
Liquid Y
A.
sodium hydroxide solution
lime water
B.
sodium hydroxide solution
sodium hydrogencarbonate solution
C.
lime water
sodium hydroxide solution
D.
lime water
hydrochloric acid
□
44.
What were the colours of liquid X and liquid Y at the end of the experiment and what were the results of iodine tests on
leaf P and leaf Q?
Liquid X
Liquid Y
Leaf P
Leaf Q
A.
colourless
milky
brown
dark blue
B.
milky
colourless
dark blue
dark blue
C.
milky
milky
brown
brown
D.
colourless
colourless
brown
dark blue
□
45. The graph below shows the changes in pH of pond water on a summer day.
The increase in pH between time points P and Q is caused by
A.
increased carbon dioxide concentration due to photosynthesis in aquatic plants.
B.
decreased carbon dioxide concentration due to photosynthesis in aquatic plants.
C.
increased carbon dioxide concentration due to respiration in aquatic plants.
D.
decreased carbon dioxide concentration due to respiration in aquatic plants.
□
In an experiment, a sample of water was collected. It was then found out that there were two kinds of algae, A and B, present in
the sample. The absorption spectra of algae A and B are shown below.
blue
green
orange
red
Light absorbance
alga A
alga B
400
450
500
550
600
650
700
Wavelength (nm)
46.
Which colour of light can be used to differentiate alga A from alga B, by promoting the growth of alga A but inhibiting
that of alga B?
A.
red
B.
green
C.
blue
D.
purple
□
47.
The leaves of a deciduous tree will turn yellow or orange before they are shed from the tree in autumn. Which of the
following statements correctly explains this phenomenon?
A. Leaves synthesise more carotenoids than chlorophyll.
B. Orange and yellow light is reflected as they become unabsorbable by chlorophyll.
C. The green chlorophyll molecules become orange in colour.
D. Chlorophyll is broken down and the colours of other pigments appear.
□
48.
Arrange the following statements in the correct order to show how oxygen gas is produced in the leaf and then enters the
atmosphere.
(1)
Oxygen passes through the stomata.
(2)
Oxygen diffuses from the mesophyll cells to the water film.
(3)
Oxygen dissolves in the water film.
(4)
Oxygen is released from the mesophyll cells.
A.
(3)  (1)  (4)  (2)
B.
(4)  (2)  (3)  (1)
C.
(3)  (4)  (1)  (2)
D.
(4)  (3)  (1)  (2)
□
49. Which of the following are the uses of photosynthetic products by plants?
(1)
releasing energy through respiration
(2)
forming starch for storage
(3)
synthesising proteins for making cells
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
□
Directions: Questions (50) to (52) refer to the flowchart below which shows the metabolic pathways in a palisade mesophyll cell.
water
(W)
oxygen
hydrogen
carbon dioxide
(X)
N
M
(Z)
(Y)
carbon dioxide
+
water
50.
proteins
Which of the processes shown in the flowchart requires light energy?
A.
(W)
B.
(X)
C.
(Y)
D.
(Z)
□
51.
What are chemicals M and N, respectively?
M
N
A.
sugars
oxygen
B.
oxygen
sugars
C.
sugars
carbon dioxide
D.
glycogen
oxygen
□
52. Which substance must the plant absorb from the soil for process (Z) to occur?
A.
sodium chloride
B.
nitrate
C.
phosphate
D.
sulphate
□
A.
B.
Rate of photosynthesis
Which of the following graphs correctly shows the effect of light intensity on the rate of photosynthesis?
Rate of photosynthesis
53.
Light intensity
D.
Rate of photosynthesis
C.
Light intensity
Rate of photosynthesis
Light intensity
Light intensity
□
Directions: Questions (54) to (57) refer to the diagram below which shows an experiment to investigate the effect of carbon
dioxide concentration on the rate of photosynthesis.
gas X
water
light
Hydrilla
Which of the following graphs correctly shows the effect of carbon dioxide concentration on the rate of photosynthesis?
B.
Rate of photosynthesis
A.
Rate of photosynthesis
54.
CO2 concentration
Rate of photosynthesis
D.
Rate of photosynthesis
C.
CO2 concentration
CO2 concentration
CO2 concentration
□
55. Gas X can be tested by using
A.
lime water.
B.
hydrogencarbonate indicator solution.
C.
caustic soda.
D.
a glowing splint.
□
56. Which of the following chemicals could be added to the water to increase the concentration of carbon dioxide?
A. sodium hydroxide
B.
sodium hydrogencarbonate
C.
calcium chloride
D.
calcium hydroxide
□
57. Before the experiment, the Hydrilla should be sterilised by using disinfectant in order to
A.
kill the microorganisms that may infect the Hydrilla.
B.
prevent the microorganisms from infecting the students.
C.
kill the microorganisms otherwise they would give out carbon dioxide.
D.
wash away dirty substances that would affect photosynthesis.
□
Directions: Questions (58) to (60) refer to the graph below which shows the amount of oxygen released by two plants under different
oxygen released
light intensities.
4
Plant X
3
2
Plant Y
1
0
10
20
30
40
50
60
light intensity (units)
58. The rate of photosynthesis is expressed in terms of the amount of oxygen released per hour by the plants. It is expressed in
this way mainly because oxygen
A.
is the only gas released by the plants.
B.
is the principal product of photosynthesis.
C.
is a measurable by-product of photosynthesis.
D.
is released constantly by all plants.
□
59. Plant X would adapt better than plant Y when living in
A.
artificial light.
B.
light of an intensity of 50 units.
C.
light of all intensities.
D.
the shade.
□
60. Under which of the following conditions probably would the greatest amount of oxygen be released?
A.
plant X in the dark
B.
plant X in a light intensity of 35 units
C.
plant Y in the dark
D.
plant Y in a light intensity of 40 units
□
Answers
Questions No.
Key
Question No.
Key
1.
C
31.
B
2.
D
32.
C
3.
D
33.
A
4.
C
34.
B
5.
B
35.
A
6.
B
36.
D
7.
A
37.
B
8.
C
38.
B
9.
B
39.
C
10.
B
40.
D
11.
C
41.
B
12.
A
42.
B
13.
D
43.
A
14.
A
44.
D
15.
A
45.
B
16.
D
46.
A
17.
B
47.
D
18.
A
48.
B
19.
D
49.
D
20.
B
50.
A
21.
D
51.
A
22.
D
52.
B
23.
C
53.
C
24.
D
54.
D
25.
C
55.
D
26.
D
56.
B
27.
B
57.
C
28.
D
58.
C
29.
C
59.
D
30.
D
60.
B