Photosynthesis — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

2 The balanced equation for photosynthesis is shown. light 6CO2 + 6H2O X + 6O2 chlorophyll What is X? A C6H12O6 B C6H12O12 C C12H6O6 D C12H12O2

1 marks

Answer: A

This question in 0654/23 May/June 2017

8 What is the equation for photosynthesis? A 6CO2 + 6H2O → C6H12O6 + 6O2 B 6CO2 + C6H12O6 → 6O2 + 6H2O C 6O2 + 6H2O → C6H12O6 + 6CO2 D 6O2 + C6H12O6 → 6CO2 + 6H2O

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2017

3 Four test-tubes were set up as shown in the diagram. Which test-tube will contain the most dissolved oxygen after 24 hours? A B C D water pond aquatic snail plant light light dark dark

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2018

2 What will cause plant leaves to turn yellow? A a lack of magnesium in the soil B a lack of starch in the leaves C a reduction in the rate of photosynthesis D a reduction in the rate of respiration

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2018

4 What traps light energy during photosynthesis? A chlorophyll B glucose C nitrate ions D water

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2018

5 What does chlorophyll enable plants to absorb? A carbon dioxide B energy from light C mineral salts D water

1 marks

Answer: B

This question in 0654/22 May/June 2019

5 Which two arrows represent photosynthesis? carbon dioxide in the air 1 2 plant 3 4 oxygen in the air A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: B

This question in 0654/23 May/June 2019

8 Hydrogencarbonate indicator changes colour with different concentrations of carbon dioxide. less more carbon dioxide carbon dioxide purple red yellow A pond contains both plants and animals. Samples of pond water are taken during a sunny day and again during the night. Each sample is tested with hydrogencarbonate indicator. What would be the results of these tests? day sample night sample A purple yellow B red purple C red red D yellow purple

1 marks

Answer: A

This question in 0654/23 May/June 2019

5 Green plants need magnesium ions. Which plant process is limited when magnesium is deficient? A meiosis B photosynthesis C pollination D respiration

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2019

1 What do plants need for their nutrition? A carbon dioxide, ions, organic compounds and light B carbon dioxide, ions, organic compounds and water C carbon dioxide, ions, light and water D carbon dioxide, organic compounds, light and water

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2019

5 Green plants need magnesium ions. Which plant process is limited when magnesium is deficient? A meiosis B photosynthesis C pollination D respiration

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2019

5 Green plants need magnesium ions. Which plant process is limited when magnesium is deficient? A meiosis B photosynthesis C pollination D respiration

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2019

5 A plant which is deficient in nitrates and magnesium has yellow leaves and poor growth. What is the importance of these two ions in plant growth? importance of nitrate ions importance of magnesium ions A making amino acids production of chlorophyll B making amino acids production of roots C making fatty acids production of chlorophyll D making fatty acids production of roots

1 marks

Answer: A

This question in 0654/21 May/June 2020

5 In photosynthesis, how many molecules of glucose will be produced from twelve molecules of carbon dioxide? A 2 B 6 C 12 D 24

1 marks

Answer: A

This question in 0654/22 May/June 2020

2 Which structure in a plant cell makes organic nutrients? A cell membrane B cell wall C chloroplast D nucleus

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2020

5 The diagram shows a destarched, variegated leaf that had a piece of black card attached. The leaf was left in a warm sunny location for a few days. green white black card The card was then removed and the leaf tested for starch. Which diagram shows the result of the starch test? A B C D

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2020

5 Which graph shows the effect of increasing light intensity on the rate of photosynthesis? A B rate of rate of photosynthesis photosynthesis light intensity light intensity C D rate of rate of photosynthesis photosynthesis light intensity light intensity

1 marks

Answer: C

This question in 0654/22 Feb/March 2021

5 The balanced equation for photosynthesis is shown. light 6CO2 + 6H2O X + 6O2 chlorophyll What is X? A C6H12O6 B C6H12O12 C C12H6O6 D C12H12O2

1 marks

Answer: A

This question in 0654/21 May/June 2021

5 The balanced equation for photosynthesis is shown. light 6CO2 + 6H2O X + 6O2 chlorophyll What is X? A C6H12O6 B C6H12O12 C C12H6O6 D C12H12O2

1 marks

Answer: A

This question in 0654/22 May/June 2021

5 The balanced equation for photosynthesis is shown. light 6CO2 + 6H2O X + 6O2 chlorophyll What is X? A C6H12O6 B C6H12O12 C C12H6O6 D C12H12O2

1 marks

Answer: A

This question in 0654/23 May/June 2021

1 The list shows some requirements of living things. 1 light 2 carbon dioxide 3 water 4 mineral ions What do plants need to make glucose? A 1 and 2 only B 2 and 3 only C 3 and 4 D 1, 2 and 3

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2021

5 What will cause plant leaves to turn yellow? A a lack of magnesium in the soil B a lack of starch in the leaves C a reduction in the rate of photosynthesis D a reduction in the rate of respiration

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2021

5 What will cause plant leaves to turn yellow? A a lack of magnesium in the soil B a lack of starch in the leaves C a reduction in the rate of photosynthesis D a reduction in the rate of respiration

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2021

5 What will cause plant leaves to turn yellow? A a lack of magnesium in the soil B a lack of starch in the leaves C a reduction in the rate of photosynthesis D a reduction in the rate of respiration

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2021

1 Plant nutrition needs light and water. Which row shows what else needs to be taken in? x v v carbon organic dioxide compounds v v v x x

1 marks

Answer: C

This question in 0654/22 Feb/March 2022

5 A plant has leaves which have white parts and green parts. One of the leaves is partly covered by a piece of black card on both sides. The plant is left in the light for two days. white part of leaf green part of leaf position of black card The leaf is then removed and tested for the presence of starch. Which row is correct? key /¥ = starch present X = starch absent 09 WD > \ & & \] TU x \ & «10 \ & \ x 1] \ & & \ ] Oo

1 marks

Answer: C

This question in 0654/22 Feb/March 2022

5 Which graph shows the effect of light intensity on the rate of photosynthesis, if all other factors are kept constant? A B rate of rate of photosynthesis photosynthesis 0 0 0 light intensity 0 light intensity C D rate of rate of photosynthesis photosynthesis 0 0 0 light intensity 0 light intensity

1 marks

Answer: D

This question in 0654/21 May/June 2022

5 Which graph shows the effect of light intensity on the rate of photosynthesis, if all other factors are kept constant? A B rate of rate of photosynthesis photosynthesis 0 0 0 light intensity 0 light intensity C D rate of rate of photosynthesis photosynthesis 0 0 0 light intensity 0 light intensity

1 marks

Answer: D

This question in 0654/22 May/June 2022

5 Which graph shows the effect of light intensity on the rate of photosynthesis, if all other factors are kept constant? A B rate of rate of photosynthesis photosynthesis 0 0 0 light intensity 0 light intensity C D rate of rate of photosynthesis photosynthesis 0 0 0 light intensity 0 light intensity

1 marks

Answer: D

This question in 0654/23 May/June 2022

1 What do plants need for their nutrition? A carbon dioxide, ions, organic compounds and light B carbon dioxide, ions, organic compounds and water C carbon dioxide, ions, light and water D carbon dioxide, organic compounds, light and water

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2022

5 Which cell does not require magnesium ions for the synthesis of chlorophyll? A B C D

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2022

1 What do plants need for their nutrition? A carbon dioxide, ions, organic compounds and light B carbon dioxide, ions, organic compounds and water C carbon dioxide, ions, light and water D carbon dioxide, organic compounds, light and water

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2022

5 The volume of oxygen produced by a submerged aquatic plant is investigated at different light intensities as shown. Which graph shows how the volume of oxygen produced varies with light intensity? A B volume of volume of oxygen oxygen produced produced 0 0 0 light intensity 0 light intensity C D volume of volume of oxygen oxygen produced produced 0 0 0 light intensity 0 light intensity

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2022

1 What do plants need for their nutrition? A carbon dioxide, ions, organic compounds and light B carbon dioxide, ions, organic compounds and water C carbon dioxide, ions, light and water D carbon dioxide, organic compounds, light and water

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2022

5 An experiment is set up to investigate the effect of changing the light intensity on the rate of photosynthesis. The lamp is moved in 10 cm intervals away from the plant and the number of bubbles of gas recorded in 60 seconds. move lamp away by 10 cm intervals up to 50 cm bubbles plant lamp beaker ruler What will be the result of moving the lamp further away from the beaker containing the plant? A The number of bubbles of carbon dioxide will decrease. B The number of bubbles of carbon dioxide will increase. C The number of bubbles of oxygen will decrease. D The number of bubbles of oxygen will increase.

1 marks

Answer: C

This question in 0654/21 May/June 2023

5 The graph shows the effect of increasing light intensity on the rate of photosynthesis of a submerged aquatic plant. rate of photosynthesis X light intensity Which factor is limiting the rate of photosynthesis at X? A carbon dioxide concentration B humidity C light intensity D temperature

1 marks

Answer: C

This question in 0654/22 May/June 2023

5 The diagram shows some of the uses in a plant of the initial carbohydrate made by photosynthesis. initial carbohydrate made in photosynthesis many of the addition of X same molecules combined together Y amino acids Which statement is correct? A X is a magnesium ion. B X is iron. C Y is starch. D Y is an oil molecule.

1 marks

Answer: C

This question in 0654/23 May/June 2023

8 Endothermic reactions use up more energy than they release while exothermic reactions release energy overall. Which row describes the type of reaction that occurs in the process of photosynthesis and in the process of respiration? respiration photosynthesis A endothermic endothermic B endothermic exothermic C exothermic endothermic D exothermic exothermic

1 marks

Answer: C

This question in 0654/23 May/June 2023

5 Which row shows the correct raw materials and products of photosynthesis? raw materials products A CO2 H2O C6H12O6 O2 B C6H12O6 H2O CO2 O2 C O2 CO2 C6H12O6 H2O D O2 C6H12O6 CO2 H2O

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2023

5 Plants need magnesium ions and nitrate ions. Which statements correctly show what the plants make using these ions? 1 Magnesium ions are needed for making amino acids. 2 Nitrate ions are needed for making amino acids. 3 Magnesium ions are needed for making chlorophyll. 4 Nitrate ions are needed for making chlorophyll. A 1 and 4 B 2 and 3 C 2 only D 4 only

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2023

13 Deforestation changes the concentration of carbon dioxide and oxygen in the atmosphere. Which statement is correct? A There is less carbon dioxide and more oxygen because there are fewer trees photosynthesising. B There is less carbon dioxide and less oxygen because there are fewer trees respiring. C There is more carbon dioxide and less oxygen because there are fewer trees photosynthesising. D There is more carbon dioxide and more oxygen because there are fewer trees respiring.

1 marks

Answer: C

This question in 0654/22 Feb/March 2024

5 The diagram shows a cross-section of a leaf of a plant. The leaf is adapted to float on water with the upper epidermis exposed to the air. lower epidermis Which statement explains one adaptation visible in the diagram? A Guard cells in the lower epidermis are always closed to stop water escaping the leaf. B The palisade mesophyll cells are next to the lower epidermis to maximise photosynthesis. C The stomata are in the upper epidermis so that gas exchange with the air can take place. D There is no cuticle in the upper epidermis to prevent water entering the leaf.

1 marks

Answer: C

This question in 0654/21 May/June 2024

5 How many molecules of carbon dioxide are needed to produce six molecules of glucose? A 1 B 2 C 3 D 36

1 marks

Answer: D

This question in 0654/22 May/June 2024

5 What is the manufacture of carbohydrates from raw materials using light energy called? A growth B photosynthesis C respiration D reproduction

1 marks

Answer: B

This question in 0654/23 May/June 2024

5 The diagram shows a mesophyll cell. In which structure does photosynthesis take place? A D B C

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2024

5 Which statement about the process of photosynthesis is correct? A Chlorophyll produces chemical energy for the synthesis of carbohydrates. B Chlorophyll produces light energy for the synthesis of carbohydrates. C Chlorophyll transfers chemical energy to light energy for the synthesis of carbohydrates. D Chlorophyll transfers light energy to chemical energy for the synthesis of carbohydrates.

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2024

5 What causes plant leaves to turn yellow? A a lack of magnesium in the soil B a lack of starch in the leaves C a reduction in the rate of photosynthesis D a reduction in the rate of respiration

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2024

4 Plants do not grow well when they are deficient in magnesium ions. What is the reason for this? A increased water uptake from the soil B not able to synthesise proteins from carbohydrates C reduced diffusion of carbon dioxide into the leaf D reduced production of chlorophyll

1 marks

Answer: D

This question in 0654/22 Feb/March 2025