Biology 0610 · IGCSE
Photosynthesis
100 practice questions on Photosynthesis, with worked solutions and instant marking.
Plants produce their own carbohydrate supplies. Which raw materials are used in this process, and what waste product is formed?
Feb/March 2016
A plant with variegated leaves is kept in a dark cupboard for 48 hours so that starch is removed from its leaves. Next, black paper is attached to one leaf, as shown, and the plant is then put in light. After 24 hours, which region of the leaf will contain starch?
Feb/March 2016
The diagram illustrates an experiment used to study gas exchange in a leaf. In what direction will the ink drop move, and why does it move that way?
Feb/March 2016
A plant with variegated leaves is first kept in a dark cupboard for 48 hours so that the starch is removed from its leaves. Black paper is then placed over one leaf, as shown, and the plant is left in light. After 24 hours, which section of the leaf will contain starch?
Feb/March 2016
Which row gives the effects on plant growth of a shortage of nitrate ions and magnesium ions?
Feb/March 2016
The diagram represents a palisade mesophyll cell taken from a green leaf. In which labelled part does photosynthesis take place, and where is starch kept?
Feb/March 2016
Fig. 7.1 shows a cross-section through part of a leaf.
Feb/March 2016
Which substances take part in photosynthesis?
Feb/March 2017
In an experiment, three glass bell jars were arranged as shown in the diagram. When the experiment ended, which bell jar contained the greatest amount of oxygen and which contained the least?
Feb/March 2017
Which substances take part in photosynthesis?
Feb/March 2017
A set of three glass bell jars was arranged as shown in the diagram. Bell jar P: a green plant was kept in sunlight for 8 hours. Bell jar Q: was left open to the air for 8 hours. Bell jar R: contained air breathed out by a student for 5 minutes. After the experiment, which bell jar contains the greatest amount of oxygen and which contains the smallest amount?
Feb/March 2017
The graph illustrates how a plant’s photosynthesis rate varies as light intensity changes, at three different carbon dioxide concentrations. In every case, the temperature is $15^\circ \text{C}$. Which factor is limiting the rate of photosynthesis at point X on the graph?
Feb/March 2017
State the word equation that represents photosynthesis.
Feb/March 2017
Which molecule has magnesium in it?
Feb/March 2018
Which molecule includes magnesium?
Feb/March 2018
The diagram illustrates an experiment used to study photosynthesis. Which gas is present in the greatest amount at the top of the tube when the experiment has finished?
Feb/March 2019
The diagram shows two cells. Which process can be performed by only one of the cells shown?
Feb/March 2019
The diagram illustrates an experiment used to investigate photosynthesis. At the end of the experiment, which gas is present in the greatest amount at the top of the tube?
Feb/March 2019
The diagram illustrates two cells. Which process is able to take place in just one of these cells?
Feb/March 2019
A student made a diagram to illustrate the substances consumed and made during photosynthesis in a leaf. 1 + 2 are consumed by the leaf. 3 + 4 are made by the leaf. Which row gives the correct labels for the diagram?
Feb/March 2020
A student created a diagram to represent the substances taken in and the substances made during photosynthesis in a leaf. $1 + 2$ are taken in by the leaf. $3 + 4$ are made by the leaf. Which row gives the correct labels for the diagram?
Feb/March 2020
During which process is oxygen produced as a waste product?
Feb/March 2021
During which process is oxygen formed as a waste product?
Feb/March 2021
A student carried out an investigation into how the concentration of carbon dioxide affects the rate of photosynthesis in an aquatic plant. The findings are shown in Table 5.1.
Feb/March 2021
What does the term organ mean?
Feb/March 2021
A plant is kept in darkness until every bit of its stored starch has been used. It is then put into light, with black paper covering part of one green leaf. After eight hours, the leaf is tested for starch. Which diagram shows how the leaf appears after this test?
Feb/March 2023
A plant is kept in darkness until all of the starch it has stored is exhausted. It is then put in light, with black paper covering part of one green leaf. After eight hours, the leaf is tested for starch. Which diagram shows how the leaf looks after this test?
Feb/March 2023
The diagram illustrates an experiment used to explore the equilibrium between respiration and photosynthesis. In which tube are photosynthesis and respiration occurring simultaneously?
Feb/March 2024
Some variegated leaves have white regions and green regions. A plant with variegated leaves has the starch removed from its leaves by keeping it in a dark cupboard for 48 hours. Black paper is then attached to one leaf as shown, and the plant is placed in light. After 24 hours, which part of the leaf contains starch?
Feb/March 2024
During an investigation, the rate of photosynthesis in a plant is measured at several temperatures. The investigation is done at three different light intensities. The results are shown. What is the limiting factor for the rate of photosynthesis at point X?
Feb/March 2024
Using the information in Fig. 3.1, predict which plant, A or B, will have the lowest rate of photosynthesis. Explain your prediction.
Feb/March 2024
A student studied the rate of photosynthesis in four plant species at $20\,^{\circ}\mathrm{C}$ and at $30\,^{\circ}\mathrm{C}$. Every other condition was kept unchanged. Which statement is a valid conclusion drawn from these data?
Feb/March 2025
In a green leaf, where are carbohydrates produced?
Feb/March 2025
The graphs illustrate how a plant’s rate of photosynthesis and rate of respiration varied during a $24$-hour period. Which graph shows the correct rate of photosynthesis and rate of respiration?
Feb/March 2025
This food chain illustrates the transfer of energy to a human. lettuce $\rightarrow$ snails $\rightarrow$ duck $\rightarrow$ human From where did the lettuce get its energy?
Feb/March 2025
In an experiment on photosynthesis, a plant is placed in bright sunlight for several hours. A leaf is then taken from the plant and tested for starch using iodine solution. The diagram shows the leaf from the plant that was used in the experiment. Which diagram shows the result of the experiment?
May/June 2016
Which two substances are formed during photosynthesis?
May/June 2016
In a photosynthesis experiment, a plant is kept in bright sunlight for several hours. After that, a leaf is taken from the plant and tested with iodine solution to check for starch. The diagram shows the leaf from the plant that was used in the experiment. Which diagram shows the outcome of the experiment?
May/June 2016
Four test-tubes are arranged as shown in the diagram and kept in direct sunlight. After several hours, which test-tube has the greatest amount of dissolved oxygen?
May/June 2016
In an experiment on photosynthesis, a plant is kept in strong sunlight for several hours. After that, a leaf is taken from the plant and tested for starch with iodine solution. The diagram shows the leaf from the plant used in the experiment. Which diagram represents the outcome of the experiment?
May/June 2016
Two comparable leaves are arranged in test tubes as illustrated. One tube is kept in light, whereas the other is left in darkness. After a few hours, what colour will the hydrogencarbonate indicator solution be in each tube?
May/June 2016
State the equation for photosynthesis once it has been balanced.
May/June 2016
The graph illustrates daily carbon dioxide uptake and transpiration in the plant $\text{Agave americana}$. This plant is adapted to survive in very dry conditions. What conclusion can be drawn from the graph?
May/June 2017
The nutrient ions in four different soils are listed below. Which soil would be the best choice for growing healthy, green plants?
May/June 2017
During which processes is light energy changed into chemical energy?
May/June 2017
Which equation represents photosynthesis?
May/June 2017
Leaves play a key role in plant nutrition.
May/June 2017
The photosynthesis equation is displayed below. ......1...... + ......2...... $\rightarrow$ glucose + ......3...... Which words correctly fill gaps 1, 2 and 3?
May/June 2018
The diagram shows a plant cell. In which labelled part of the cell is sugar produced?
May/June 2018
The apparatus is arranged as shown. The green indicator becomes yellow when the concentration of carbon dioxide rises. The green indicator becomes blue when the concentration of carbon dioxide falls. After several hours, the indicator in test-tube X became blue. The indicator in test-tube Y stayed green. Which process brought about the colour change?
May/June 2018
The diagram illustrates a plant cell. In which labelled part of the cell is sugar produced?
May/June 2018
The diagram illustrates a plant cell. In which labelled structure is sugar produced?
May/June 2018
The equation for photosynthesis is shown. ......1...... + ......2...... → glucose + ......3...... Which words correctly fill gaps 1, 2 and 3?
May/June 2018
The experiment is arranged as illustrated. The green indicator changes to yellow if the concentration of carbon dioxide rises. The green indicator changes to blue if the concentration of carbon dioxide falls. After a few hours, the indicator in test-tube X had turned blue. The indicator in test-tube Y stayed green. Which process led to the colour change?
May/June 2018
During a 24 hour period, the carbon dioxide concentration in the air above a crop of maize plants was recorded. No wind was blowing throughout the 24 hours of the investigation. The findings are shown in Fig. 9.1.
May/June 2018
State the word equation for photosynthesis.
May/June 2018
The diagram illustrates an experiment designed to examine the balance between respiration and photosynthesis. In which tube are photosynthesis and respiration happening at the same time?
May/June 2019
Which process uses the main source of energy input to biological systems?
May/June 2019
The apparatus shown was arranged. Several hours later, the water in the beaker had become blue, and the liquid in the glass tube had risen upwards. Which processes produced these changes?
May/June 2019
The diagram illustrates an experiment designed to examine the balance between respiration and photosynthesis. In which tube are photosynthesis and respiration occurring simultaneously?
May/June 2019
The food chain illustrates the route by which energy reaches a human: lettuce $\rightarrow$ snails $\rightarrow$ duck $\rightarrow$ human. From where did the energy in the lettuce originate?
May/June 2019
The diagram illustrates an experiment used to study the balance between respiration and photosynthesis. In which tube are photosynthesis and respiration occurring at the same time?
May/June 2019
The diagram illustrates an experiment designed to explore the relationship between respiration and photosynthesis. In which tube are photosynthesis and respiration occurring simultaneously?
May/June 2019
The diagram illustrates an experiment designed to examine the balance between respiration and photosynthesis. In which tube do photosynthesis and respiration occur at the same time?
May/June 2019
Some gardeners apply Epsom salts (magnesium sulfate) as a fertiliser for their plants. Epsom salts add magnesium ions to the soil. In what way would this help the plants?
May/June 2019
The diagram illustrates an experiment designed to examine the relationship between respiration and photosynthesis. In which tube are photosynthesis and respiration both occurring at the same time?
May/June 2019
The rate of photosynthesis in terrestrial plants can be found by measuring how much carbon dioxide is absorbed.
May/June 2019
Atmospheric carbon dioxide concentration has risen markedly in recent years.
May/June 2019
State the word equation that represents photosynthesis.
May/June 2019
A plant with striped leaves was placed in bright light for six hours. A leaf was removed from the plant and its chlorophyll was taken out. The leaf was then tested for starch with iodine solution. Which diagram shows the outcome of the test?
May/June 2021
A plant with striped leaves was placed in bright light for six hours. One leaf was removed from the plant, and the chlorophyll was taken out. The leaf was then tested with iodine solution for starch. Which diagram shows the outcome of the test?
May/June 2021
Which part of a cell produces glucose?
May/June 2021
A plant with striped leaves was left in bright light for six hours. A leaf was removed from the plant, and the chlorophyll was taken out. The leaf was then tested for starch with iodine solution. Which diagram shows the outcome of the test?
May/June 2021
A plant with striped leaves was left in bright light for six hours. One leaf was removed from the plant and its chlorophyll was taken out. The leaf was then checked for starch with iodine solution. Which diagram shows the test result?
May/June 2021
A plant that had striped leaves was placed in bright light for six hours. One leaf was removed from the plant and its chlorophyll was taken out. The leaf was then tested with iodine solution for starch. Which diagram shows the outcome of the test?
May/June 2021
A plant with striped leaves was placed in bright light for six hours. One leaf was removed from the plant and its chlorophyll was taken out. The leaf was then tested for starch with iodine solution. Which diagram shows the result of the test?
May/June 2021
Within which cell structure does photosynthesis occur?
May/June 2021
Use the information in Fig. 8.1 to state one factor needed for germination.
May/June 2021
State which chemical elements are present in a carbohydrate.
May/June 2021
Using the apparatus shown in Fig. 3.1, scientists measured the rate of photosynthesis in the leaves of a sunflower plant, Helianthus annuus.
May/June 2021
Which chemical produced during photosynthesis leaves a green leaf via its stomata?
May/June 2022
Which process relies on the principal source of energy input to biological systems?
May/June 2022
Which chemical is produced during photosynthesis and leaves a green leaf through its stomata?
May/June 2022
Which process makes use of the main source of energy entering biological systems?
May/June 2022
Which chemical, made during photosynthesis, leaves a green leaf through its stomata?
May/June 2022
A student carried out an investigation into one factor that influences photosynthesis. A section of a leaf was hidden with black paper, as shown. After two days, the student tested the leaf to see whether starch was present. Which factor was being investigated by the student?
May/June 2022
Which process makes use of the main source of energy input to biological systems?
May/June 2022
Tomato fruit production was measured under five different environmental conditions. What is a correct conclusion from the data shown in the graph?
May/June 2022
The statements below refer to some events that happen in a plant after chlorophyll absorbs light energy. 1. changed into chemical energy 2. changed into sucrose for translocation 3. starch is stored in the roots or seeds 4. glucose is made What is the correct sequence for these events?
May/June 2022
If a plant lacks magnesium ions, the areas between its leaf veins may turn yellow. Why does this happen?
May/June 2022
The graph illustrates the rate of photosynthesis at various carbon dioxide concentrations. What might be the limiting factor for photosynthesis at X on the graph?
May/June 2022
On Fig. 8.1, draw a single arrow to show respiration in plants.
May/June 2022
Photosynthesis is a process occurring in plant cells.
May/June 2022
Fig. 1.1 depicts a spongy mesophyll cell from a plant leaf. The arrows indicate the overall movement direction of carbon dioxide molecules during daylight.
May/June 2022
Glasshouses are built to maximise the yield of crop plants.
May/June 2022
An investigation is arranged to examine gas exchange in aquatic plants. The hydrogencarbonate indicator solution is orange at the beginning. What colour is it after three hours?
May/June 2023
Four test tubes are arranged as illustrated. After one hour, which test tube has the smallest amount of carbon dioxide?
May/June 2023
Four test-tubes are arranged as shown and left in bright sunlight. After several hours, which test-tube has the greatest amount of oxygen?
May/June 2023
Which statement concerning photosynthesis is correct?
May/June 2023
An experiment is arranged to investigate gas exchange in aquatic plants. The hydrogencarbonate indicator solution is orange at the beginning. Which colour does it become after three hours?
May/June 2023