2.9 Photosynthesis Paper 1 Possible Mult Choice · PDF file2.9 Photosynthesis Paper 1 –...

IB Questionbank Biology 1

2.9 Photosynthesis Paper 1 – Possible Mult Choice Questions

1. What is the source of the oxygen released into the air as a product of photosynthesis?

A. Chlorophyll

B. Carbon dioxide only

C. Water only

D. Both water and carbon dioxide (Total 1 mark)

2. Which type of light is least useful for photosynthesis in terrestrial plants?

A. Blue

B. Green

C. White

D. Red (Total 1 mark)

3. Which variable has the least effect on enzyme activity?

A. Temperature

B. Light intensity

C. pH

D. Substrate concentration (Total 1 mark)


4. The diagram below summarizes the light-dependent reactions in photosynthesis. What is

occurring at X?

Electrons

Photosystem II

Light

Electrons

Light

Photosystem I

X

A. ADP + phosphate ATP

B. NADP+NADPH + H

+

C. H2O O2–

+ 2H+

D. NADPH + H+ NADP

+

(Total 1 mark)

5. What is the first identifiable product of carbon dioxide fixation in photosynthesis?

A. Ribulose bisphosphate (RuBP)

B. Glycerate3-phosphate (GP)

C. Triose phosphate (TP)

D. Acetyl CoA (Total 1 mark)


6. Which of the following terms correctly describe the molecule below?

C

H

OH

C

C

H

OH

C

O

H

C

CH

OH

H

OH

H

OHH

I. Monosaccharide

II. Ribose

III. Carbohydrate

A. I only

B. I and III only

C. II and III only

D. I, II and III (Total 1 mark)

7. Which two colours of light does chlorophyll absorb most?

A. Red and yellow

B. Green and blue

C. Red and green

D. Red and blue (Total 1 mark)


8. Where in the cell does the Calvin cycle take place?

A. Stroma of chloroplast

B. Mitochondrial matrix

C. Cytoplasm

D. Inside thylakoid (Total 1 mark)

9. What reaction, involving glycerate 3-phosphate, is part of the light-independent reactions of

photosynthesis?

A. Glycerate 3-phosphate is carboxylated using carbon dioxide.

B. Two glycerate 3-phosphates are linked together to form one hexose phosphate.

C. Glycerate 3-phosphate is reduced to triose phosphate.

D. Five glycerate 3-phosphates are converted to three ribulose 5-phosphates. (Total 1 mark)

10. What is the advantage of having a small volume inside the thylakoids of the chloroplast?

A. High proton concentrations are rapidly developed.

B. High electron concentrations are rapidly developed.

C. Photosynthetic pigments are highly concentrated.

D. Enzymes of the Calvin cycle are highly concentrated. (Total 1 mark)


11. What conclusion can be drawn from examining the action spectrum for a green plant shown

below?

A. Yellow light is the most effective at promoting photosynthesis.

B. Every colour of light is equally effective at promoting photosynthesis.

C. Light of wavelength 550 nm is least effective at promoting photosynthesis.

D. Light in the green range is the most effective at promoting photosynthesis. (Total 1 mark)

12. Which of the following colours of light is absorbed the most by chlorophyll?

A. Blue

B. Green

C. Yellow

D. Orange (Total 1 mark)


13. Which of the following graphs represents the effect of changing light intensity on the rate of

oxygen production by a green plant?

(Total 1 mark)


14. What is light energy used for during photosynthesis?

A. To produce carbon dioxide

B. To produce water molecules

C. To produce ATP

D. To break down sugar molecules (Total 1 mark)

15. Where are complex carbohydrates made in the chloroplast?

A. In the intermembrane space

B. In the stroma

C. On the inner membrane

D. In the thylakoid space (Total 1 mark)

16. Which two tissues of a leaf are photosynthetic?

A. Upper epidermis and palisade mesophyll

B. Palisade mesophyll and spongy mesophyll

C. Spongy mesophyll and xylem

D. Upper epidermis and xylem (Total 1 mark)


17. Where is chlorophyll found in a plant cell?

A. Thylakoid membranes

B. Stroma

C. Matrix

D. Cristae (Total 1 mark)

18. What happens in the light-independent reactions of photosynthesis?

A. Splitting of water molecules

B. ATP synthesis

C. Reduction of NADP

D. Reduction of CO2

(Total 1 mark)

19. Which graph best represents the effect of temperature on the rate of photosynthesis of a plant?


(Total 1 mark)

20. What is produced by the light-dependent reactions of photosynthesis and used in the Calvin

cycle?

A. Hydrogen and oxygen

B. ATP and NADPH

C. NADPH and oxygen

D. ATP and CO2

(Total 1 mark)

21. The photosynthetic activity of desert plants is often reduced in the middle of the day. What is

the most reasonable explanation for this fact?

A. Enzymes are denatured by the high temperatures.

B. There is not sufficient water for photosystem I.

C. Most of the light is reflected by the thick cuticle.

D. The stomata close to preserve water and gas exchange decreases. (Total 1 mark)

22. How can the rate of photosynthesis of a plant be directly measured?

A. By measuring the rate of oxygen produced

B. By measuring the rate of carbon dioxide produced

C. By measuring the rate of plant growth

D. By measuring the rate of light absorbed (Total 1 mark)

23. A plant is exposed to increasing light intensity from very dim to bright light, while the carbon

dioxide concentration and temperature are kept at an optimum level. What will happen to the

rate of oxygen production?

A. It will increase exponentially.

B. It will remain constant.

C. It will decrease to a minimum level.

D. It will increase to a maximum level. (Total 1 mark)


24. The diagram below shows the structure of a chloroplast.

What is the structure labelled X?

A. Ribosome

B. Stroma

C. Inner membrane

D. Thylakoid (Total 1 mark)

25. 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

(Total 1 mark)


26. What is needed in photosynthesis to convert carbon dioxide into organic molecules?

A. Light and hydrogen from the splitting of water

B. Light and oxygen from the splitting of water

C. ATP and hydrogen from the splitting of water

D. ATP and oxygen from the splitting of water (Total 1 mark)

27. Which combination measures the rate of photosynthesis?

Direct measurement Indirect measurement

A. Oxygen production Biomass increase

B. Carbon dioxide uptake Biomass decrease

C. Oxygen uptake Biomass increase

D. Carbon dioxide production Biomass decrease

(Total 1 mark)

28. What is the first identifiable product of carbon dioxide fixation in photosynthesis?

A. Ribulose bisphosphate (RuBP)

B. Glycerate3-phosphate (GP)

C. Triose phosphate (TP)

D. Acetyl CoA (Total 1 mark)


29. What colours of light give the two peaks on the graph of the action spectrum of photosynthesis

shown below?

% absorption

wavelength of light

A. Red and infrared

B. Green and red

C. Blue and green

D. Blue and red (Total 1 mark)

30. What substance is moved into the thylakoids of the chloroplast using energy derived from light?

A. Carbon dioxide (CO2 )

B. Protons (H+)

C. Glycerate 3-phosphate (GP)

D. Adenosine triphosphate (ATP) (Total 1 mark)


31. Which limiting factor of photosynthesis is shown below?

Rat

e o

f p

hoto

syn

thes

is

A. Increasing carbon dioxide concentration

B. Increasing temperature

C. Increasing light intensity

D. Increasing humidity (Total 1 mark)

32. How is the proton gradient generated in chloroplasts during photosynthesis?

A. Flow of electrons from carrier to carrier in the thylakoid membrane causes pumping of

protons across the thylakoid membrane.

B. Light causes protons to flow through protein channels in the thylakoid membrane.

C. Light splits water molecules in the stroma, causing the release of protons.

D. Protons are pumped across the thylakoid membrane using energy from ATP. (Total 1 mark)


33. The diagram below shows the light independent stage of photosynthesis (the Calvin Cycle).

Ribulose

Glucose

bisphosphate

I (RuBP)

CO2

Triose Phosphate II

(TP)

Glycerate 3–Phosphate

(GP)

III

Where is energy, from ATP generated during the light dependent stage, used in this cycle?

A. I and II only

B. I and III only

C. II and III only


34. Why do leaves of plants look green?

A. Most of the green light is absorbed by chlorophyll and most of the red and blue light is

reflected.

B. Most of the blue light is absorbed by chlorophyll and most of the red and green light is

reflected.

C. Most of the red light is absorbed by chlorophyll and most of the green and blue light is

reflected.

D. Most of the red and blue light is absorbed by chlorophyll and most of the green light is

reflected. (Total 1 mark)


35. What chemical substances are used during the manufacture of organic molecules in

photosynthesis?

I. Hydrogen

II. ATP

III. Carbon dioxide

A. I and III only

B. I and II only

C. II and III only


36. In the graph below which line shows an action spectrum of photosynthesis?

Relative rate of

photosynthesis

B DA

C

400 500 600 700

Wavelength / nm (Total 1 mark)


37. Which diagram represents the action spectrum of photosynthesis?

A.

Rel

ativ

e ra

te o

f

ph

oto

syn

thes

is

100

80

60

40

20

0

400 500 600 700

Wavelength

B.

Rel

ativ

e ra

te o

f

ph

oto

syn

thes

is

100

80

60

40

20

0

400 500 600 700

Wavelength

C.

Rel

ativ

e ra

te o

f

ph

oto

syn

thes

is

100

80

60

40

20

0

400 500 600 700

Wavelength

D.

Rel

ativ

e ra

te o

f

ph

oto

syn

thes

is

100

80

60

40

20

0

400 500 600 700

Wavelength (Total 1 mark)

38. Why is the action spectrum for photosynthesis similar to the absorption spectra of

photosynthetic pigments?

A. Photosynthetic pigments have the same optimum temperature as the enzymes used in

photosynthesis.

B. Plants absorb the same photosynthetic pigments for use in photosynthesis.

C. Only wavelengths of light absorbed by pigments can be used in photosynthesis.

D. The amount of energy absorbed by photosynthetic pigments is equal to the activation

energy for photosynthesis. (Total 1 mark)


39. Which graph shows the effect of increasing carbon dioxide concentration (CO2 ) on the rate of

photosynthesis?

A.

B.

C.


D.

(Total 1 mark)

40. Pigments are extracted from the leaves of a green plant. White light is then passed through the

solution of pigments. What effect do the leaf pigments have on the white light?

A. Green wavelengths are absorbed and red and blue wavelengths are transmitted.

B. Red and blue wavelengths are absorbed and green wavelengths are transmitted.

C Blue wavelengths are absorbed and green and red wavelengths are transmitted.

D. Green and red wavelengths are absorbed and blue wavelengths are transmitted. (1)


41. Which diagram represents the process of cyclic photophosphorylation?

(Total 1 mark)

42. What would be the effect of increasing temperature on the rate of photosynthesis in a green

plant?

A. It increases constantly.

B. It increases up to a point and then remains constant.

C. It increases up to a point and then decreases.

D. It remains constant. (Total 1 mark)

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