Photosynthesis — Paper 1 · IGCSE Sciences - Co-ordinated (9-1) 0973

5 A farmer observes that his field of grass is not looking as green as it should be. Which substance is likely to be in short supply? A carbon dioxide in the air B magnesium in the soil C nitrogen in the air D water in the soil

1 marks

Answer: B

This question in 0973/11 May/June 2020

5 The diagram shows a variegated leaf. white area green area Which requirement for photosynthesis can be tested using this leaf but not a completely green leaf? A carbon dioxide B chlorophyll C light D water

1 marks

Answer: B

This question in 0973/12 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 0973/11 Oct/Nov 2020

5 Which are the products of photosynthesis in a green plant? A carbon dioxide and water B glucose and carbon dioxide C oxygen and glucose D oxygen and water

1 marks

Answer: C

This question in 0973/11 Oct/Nov 2020

5 Four test-tubes were set up as shown. 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 0973/11 May/June 2021

5 Four test-tubes were set up as shown. 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 0973/12 May/June 2021

13 Which process removes carbon dioxide from the atmosphere? A combustion B photosynthesis C respiration D transpiration

1 marks

Answer: B

This question in 0973/12 May/June 2021

5 The diagram shows an experiment to investigate photosynthesis. When leaves photosynthesise, they store some carbohydrates as starch. Potassium hydroxide absorbs carbon dioxide. cotton wool with vaseline to seal leaf L the flask leaf M potassium hydroxide water After standing in sunlight for 10 hours, leaf L contained no starch but leaf M contained a lot of starch. What does this show? A A leaf cannot make starch in a sealed flask. B A leaf cannot make starch without carbon dioxide. C A leaf cannot make starch without light. D A leaf cannot make starch without oxygen.

1 marks

Answer: B

This question in 0973/11 Oct/Nov 2021

5 A student places a plant in the dark for 24 hours. Aluminium foil is then placed around one leaf. A second leaf is sealed in a bag with soda lime to remove carbon dioxide. A third leaf is then sealed in a bag with iron filings to remove oxygen. The plant is then left in the light for a further 24 hours. The diagram shows the experiment. Y aluminium foil wrapped around leaf X Z iron filings to soda lime to remove remove oxygen carbon dioxide Which leaves would turn blue-black when tested with iodine solution? A X only B X and Y C Y and Z D Z only

1 marks

Answer: A

This question in 0973/11 May/June 2022

5 The diagram shows an investigation into factors affecting photosynthesis. aluminium green green white green foil leaf leaf leaf leaf sodium hydroxide to remove carbon dioxide The tubes are left for 24 hours after which the leaves are tested with iodine solution. How many of these leaves turn blue-black when tested with iodine solution? A 1 B 2 C 3 D 4

1 marks

Answer: A

This question in 0973/12 May/June 2022

5 Which row is correct for photosynthesis? raw materials products A carbon dioxide and glucose oxygen and water B carbon dioxide and water oxygen and glucose C oxygen and glucose carbon dioxide and water D oxygen and water carbon dioxide and glucose

1 marks

Answer: B

This question in 0973/11 Oct/Nov 2022

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 0973/11 May/June 2023

5 The diagram shows a leaf, still attached to a plant, with both green and white areas that have been partly covered with black paper. The leaf is left in bright light for six hours and then tested for starch. Which area of the leaf turns blue-black after the starch test? A B C green area white area D black paper

1 marks

Answer: B

This question in 0973/12 May/June 2023

5 Which conditions will result in the highest rate of photosynthesis? carbon dioxide light intensity concentration A high high B high low C low high D low low

1 marks

Answer: A

This question in 0973/11 Oct/Nov 2023

5 The rate of photosynthesis of an aquatic plant is measured by counting the number of bubbles of oxygen produced every minute, as shown. The rate is measured at different light intensities. boiling tube water aquatic plant Which two variables need to be kept constant? A size of plant and temperature of the water B light intensity and size of the boiling tube C size of plant and size of the boiling tube D temperature of the water and light intensity

1 marks

Answer: A

This question in 0973/11 May/June 2024

6 The starch in a plant is removed. One part of a leaf of the plant is covered with black card. black card The plant is then put in the light for six hours. The card is removed and the leaf is tested for starch using iodine solution. Which row shows the colours of the iodine solution after it is added to different parts of the leaf? part of leaf not covered by card covered by card A blue-black blue-black B blue-black yellow C yellow blue-black D yellow yellow

1 marks

Answer: B

This question in 0973/11 May/June 2025

5 Which statement about photosynthesis is correct? A A plant uses carbon dioxide and glucose to produce oxygen and water. B A plant uses carbon dioxide and water to produce glucose and oxygen. C A plant uses glucose and oxygen to produce carbon dioxide and water. D A plant uses oxygen and water to produce glucose and carbon dioxide.

1 marks

Answer: B

This question in 0973/12 May/June 2025

6 The diagram shows a section through a cell from a leaf. Which part makes glucose using light? B C A D

1 marks

Answer: D

This question in 0973/11 Oct/Nov 2025