DP IB Biology: HL

Topic Questions

IBBiology: HLDPTopic Questions8. Metabolism, Cell Respiration & Photosynthesis (HL Only)8.3 Photosynthesis

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First teaching 2014

Last exams 2024

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8.3 Photosynthesis

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1
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Which of the following correctly identifies the location of the light-dependent reactions?

  • In the stroma of the chloroplast

  • In the thylakoid intermembrane space

  • On the outer membrane of the mitochondria

  • On the outer membrane of the chloroplast

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2
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Which of the following would be a suitable definition for the term 'photolysis'?

  • The splitting of water molecules using light energy

  • The splitting of an oxygen molecule into oxygen atoms

  • The splitting of water into protons, neutrons and oxygen

  • The splitting of water by means of hydrolysis reactions

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3
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Which of the following would not be considered an adaptation of chloroplasts to photosynthesis?

  • The granal stacks create a large surface area for the maximum absorption of light by the photosystems

  • The presence of ribosomes allows for the formation of the necessary polysaccharides involved with photosynthesis

  • The chloroplast DNA contains genes coding for proteins and enzymes used in photosynthesis

  • The stroma contains enzymes that catalyse the reactions of the light-independent stage

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4
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During which of the following processes does carbon fixation occur?

  • Light dependent reactions

  • Photolysis

  • Calvin cycle

  • Chemiosmosis

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5
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Which of the following scientists conducted experiments that explained the conversion of carbon into carbohydrates during photosynthesis?

  • Martin Kamen

  • Samuel Ruben

  • Peter Mitchell

  • Melvin Calvin

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1
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The diagram below shows the Calvin cycle of the light-independent reactions.

13-1-fig-5-1

Which of the following correctly identifies compound M to P?

  M N O P
A. carbon dioxide ribulose bisphosphate glycerate 3-phosphate glucose
B. carbon dioxide glycerate 3-phosphate ribulose bisphosphate glucose
C. Rubisco glycerate 3-phosphate ribulose bisphosphate triose phosphate
D. carbon dioxide triose phosphate glycerate 3-phosphate ribulose bisphosphate

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2
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The following steps describe non-cyclic photophosphorylation involving the electron transport chain.

  1. Electrons from the photolysis of water replace lost electrons from photosystem II
  2. Light passes to primary pigments in photosystem I and II
  3. Electrons are passed from photosystem II to photosystem I via electron transport chain
  4. Energy is released to synthesise ATP
  5. Electrons are excited to a higher energy level

Which of the following represents the correct sequence of the steps?

  • II. → V. → IV. → III. → I.

  • V. → IV. → III. → II. → I.

  • II. → V. → III. → IV. → I.

  • V. → III. → IV. → II. → I.

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3
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The following molecules are all involved with the process of photosynthesis.

  1. Glucose
  2. ATP
  3. Water
  4. Reduced NADP
  5. Carbon dioxide

Which of these molecules are involved with both the light dependent and light independent reactions?

  • I. and III.

  • II. and IV.

  • I., II. and IV.

  • II., IV. and V.

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4
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Which of the following provides the best explanation of the process illustrated in the diagram?8-3_q4h

  • Photosystem I and ferredoxin is involved with the reduction of NADP so that the hydrogen can be used during the light independent stage of photosynthesis

  • Photosystem II and ferredoxin is involved with the reduction of NADP so that the hydrogen can be used during the light independent stage of photosynthesis

  • Photosystem I and plastoquinone is involved with the reduction of NADP so that the hydrogen can be used during the light independent stage of photosynthesis

  • Photosystem I and ferredoxin is involved with the reduction of NADP so that the hydrogen can be used during the light dependent stage of photosynthesis

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5
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Which of the following statements is not correct with regards to chemiosmosis in photosynthesis?

  1. Protons move down their concentration gradient through ATP synthase located in the chloroplast membrane
  2. The photolysis of water provides protons needed for chemiosmosis to occur
  3. ADP is phosphorylated to ATP due to the energy released by the movement of electrons down the electron transport chain
  4. A high concentration of protons build up outside the intermembrane space, creating a concentration gradient

  • I. and IV. only

  • II. and III. only

  • I., III. and IV.

  • II., III. and IV.

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11 mark

The image below shows a chloroplast.q1_8-3_photosynthesis_ib_biology_hl_mcq

Identify the location of the light independent and light dependent reactions.

 

Location of light independent reaction

Location of light dependent reaction
A

1

3
B

3

2
C

1

4
D

3

1

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21 mark

Which events occur during the light dependent stage of photosynthesis?

  1. ATP is produced
  2. NADP is reduced to NADPH
  3. Water splits into photons, electrons and oxygen
  4. NADPH is oxidised to NADP

  • All of them

  • I, II, III

  • I, III, IV

  • II, III, IV

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31 mark

What are the functions of excited electrons in photosynthesis?

  1. To generate a proton gradient
  2. To reform RuBP
  3. To reduce G3P
  4. To reduce NADP

  • I, III, IV

  • II, III, IV

  • I, IV

  • I, III

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41 mark

Which event occurs during non-cyclic photophosphorylation?

  • Dephosphorylation of ATP

  • Reduced NADH is synthesised

  • Chemiosmosis in the stroma of the chloroplast

  • Excited electrons enter an electron transport chain

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51 mark

Which process is not part of the light-independent reaction of photosynthesis?

  • Glycerate-3-phosphate is converted to triose phosphate

  • Rubisco is regenerated from triose phosphate

  • ATP is dephosphorylated to ADP

  • Carboxylation of RuBP

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61 mark

What allows the cyclic nature of the Calvin cycle?

  • Reduced NADP accumulates in the stroma

  • A buildup of ATP in the stroma 

  • Decarboxylation of Ribulose bisphosphate

  • The catalytic nature of RuBP 

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71 mark

Which technological methods were used by Melvin Calvin in his studies of the light-independent reactions of photosynthesis?

 

Autoradiography

Paper chromatography

Thin layer chromatography

Use of radioactive sources
A

No

No

Yes

Yes
B

Yes

Yes

No

No
C

Yes

Yes

No

Yes
D

Yes

No

Yes

No

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81 mark

Melvin Calvin used radioactive sources of carbon dioxide in his research using the alga Chlorella.

Which molecule would be the first to contain radioactive carbon-14 in Chlorella that was grown in the presence of radioactive carbon dioxide?

  • Ribulose bisphosphate

  • Glycerate-3-phosphate

  • Triose phosphate

  • Rubisco

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91 mark

Where is ATP synthase located in the chloroplast below?q1_8-3_photosynthesis_ib_biology_hl_mcq

  • 1

  • 2

  • 3

  • 4

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101 mark

The thylakoid intermembrane space has a small volume.

What advantage does this have for photosynthesis?

  • High proton concentration can be rapidly developed

  • Short diffusion pathway for the movement of hydrogen ions

  • High electron concentration can be readily developed

  • Rapid accumulation of reduced NADP

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