Photosynthesis — Paper 1 · IGCSE Science - Combined 0653

11 The diagram shows a section through a leaf. During photosynthesis, where would the greatest conversion of light energy to chemical energy take place? A B C D

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2005

3 In what form is carbohydrate stored in a leaf? A fat B protein C starch D Vitamin C

1 marks

Answer: C

This question in 0653/11 May/June 2006

7 There are four stages in testing a leaf for starch. 1 soften in hot water 2 stain with iodine 3 boil in alcohol 4 boil in water What is the correct order for these stages? A 1 2 3 4 B 1 4 3 2 C 3 1 2 4 D 4 3 1 2

1 marks

Answer: D

This question in 0653/11 May/June 2006

12 In the carbon cycle, several different processes may release carbon dioxide from dead organisms. Which process does not do so? A combustion B decomposition C photosynthesis D respiration

1 marks

Answer: C

This question in 0653/11 May/June 2006

7 The diagram shows some cells in a leaf of a green plant. In which layer of cells does most photosynthesis occur? sunlight A B C D gases enter

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2006

3 The flow diagram shows the stages in testing a green leaf for starch. 1, 2, 3 and 4 are all liquids. 4 iodine solution white tile hot water 1 2 3 boiling water boiling alcohol warm water What are the colours of liquids 1, 2, 3 and 4 at the end of each stage for a leaf that contains starch? 1 2 3 4 A colourless green colourless blue / black B colourless colourless green brown C green colourless colourless blue / black D green green colourless brown

1 marks

Answer: A

This question in 0653/11 May/June 2007

4 A water plant is exposed to sunlight. After a short period of time bubbles are given off from the plant. Which gas do the bubbles contain, and which process produces this gas? gas process A carbon dioxide photosynthesis B carbon dioxide respiration C oxygen photosynthesis D oxygen respiration

1 marks

Answer: C

This question in 0653/11 Oct/Nov 2007

4 Which two chemical substances are required for photosynthesis? A carbon dioxide and glucose B glucose and oxygen C oxygen and water D water and carbon dioxide

1 marks

Answer: D

This question in 0653/11 May/June 2008

5 The diagram shows two identical plants in different conditions. X black cover Which processes occur in plant X and in plant Y? Y light X photosynthesis respiration photosynthesis respiration 0 0O WwW > v x x x ~ KOK v v v v x key / = process occurs X = process does not occur KS

1 marks

Answer: B

This question in 0653/11 May/June 2008

7 The flow chart shows a green leaf being tested for the presence of starch. 1 2 3 4 boil hot boil warm 0.5 min 2 min 1 min What are substances 1, 2, 3 and 4? 1 2 3 4 A alcohol water iodine water B water alcohol water iodine C water water alcohol iodine D water water alcohol water

1 marks

Answer: D

This question in 0653/11 May/June 2008

2 The diagram shows a leaf in sunlight and some of the substances that diffuse into and out of it. water vapour carbon oxygen dioxide Which of the following has a higher concentration outside the leaf than inside the leaf? A carbon dioxide only B carbon dioxide and oxygen C oxygen and water D water vapour only

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2008

12 The diagram shows part of the carbon cycle. carbon dioxide in the air 1 6 3 carbon compounds carbon compounds in fossil fuels in animals 4 carbon compounds 2 in plants carbon compounds 5 in dead animals and plants During which stage in the cycle will oxygen be added to the air? A 1 B 3 C 5 D 6

1 marks

Answer: D

This question in 0653/11 Oct/Nov 2008

12 Which process takes carbon dioxide out of the air? A combustion B decomposition C photosynthesis D respiration

1 marks

Answer: C

This question in 0653/11 May/June 2009

4 The diagram shows the apparatus used in an investigation on gas exchange in organisms. In which test-tube would the concentration of oxygen decrease most rapidly? A B C D light light water snail plant light proof black box

1 marks

Answer: D

This question in 0653/11 May/June 2010

2 The diagram shows the apparatus used in an investigation on gas exchange in organisms. In which test-tube would the concentration of oxygen decrease most rapidly? A B C D light light water snail plant light proof black box

1 marks

Answer: D

This question in 0653/12 May/June 2010

3 Which substances may diffuse into and out of plant cells? into plant cells out of plant cells A chlorophyll oxygen B oxygen water C starch chlorophyll D water starch

1 marks

Answer: B

This question in 0653/12 May/June 2010

2 The diagram shows the apparatus used in an investigation on gas exchange in organisms. In which test-tube would the concentration of oxygen decrease most rapidly? A B C D light light water snail plant light proof black box

1 marks

Answer: D

This question in 0653/13 May/June 2010

7 The diagram shows the arrangement of cells in a vertical section of a leaf of a green plant. No cell contents are shown. 1 2 3 4 5 In which cells is light energy turned into chemical energy? A 1, 2 and 4 B 1, 3 and 4 C 2, 3 and 5 D 2, 4 and 5

1 marks

Answer: C

This question in 0653/11 May/June 2011

5 The diagram shows the arrangement of cells in a vertical section of a leaf of a green plant. No cell contents are shown. 1 2 3 4 5 In which cells is light energy turned into chemical energy? A 1, 2 and 4 B 1, 3 and 4 C 2, 3 and 5 D 2, 4 and 5

1 marks

Answer: C

This question in 0653/12 May/June 2011

6 When a leaf is photosynthesising, in which direction do gases diffuse through the stomata? carbon dioxide oxygen A in in B in out C out in D out out

1 marks

Answer: B

This question in 0653/13 Oct/Nov 2011

4 The diagram shows some cells in a leaf of a green plant. In which layer of cells does most photosynthesis occur? sunlight D A B C gases enter

1 marks

This question in 0653/11 May/June 2012

12 Which process takes carbon dioxide out of the air? A combustion B decomposition C photosynthesis D plant respiration

1 marks

This question in 0653/11 May/June 2012

3 The diagram shows part of a cross-section of a leaf. Where is light energy used? A B C D

1 marks

Answer: D

This question in 0653/12 May/June 2012

3 The diagram shows part of a cross-section of a leaf. Where is light energy used? A B C D

1 marks

Answer: D

This question in 0653/13 May/June 2012

4 Which two chemical substances are required for photosynthesis? A carbon dioxide and glucose B glucose and oxygen C oxygen and water D water and carbon dioxide

1 marks

Answer: D

This question in 0653/12 May/June 2013

3 Which two chemical substances are required for photosynthesis? A carbon dioxide and glucose B glucose and oxygen C oxygen and water D water and carbon dioxide

1 marks

Answer: D

This question in 0653/13 May/June 2013

4 What must be present for photosynthesis to occur? chlorophyll light oxygen water A v v v v B v v x v Cc x v v x D x x x v key v =is necessary X =not necessary

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2013

8 A healthy plant has been in the light. A leaf is taken from it, decolourised and then tested with iodine solution. What colour does the iodine solution become? A black B brick red C green D pale blue

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2013

2 The diagram shows a leaf in sunlight and some of the substances that diffuse into and out of it. water vapour carbon oxygen dioxide Which of the following has a higher concentration outside the leaf than inside the leaf? A carbon dioxide only B carbon dioxide and oxygen C oxygen and water vapour D water vapour only

1 marks

Answer: A

This question in 0653/12 Oct/Nov 2013

4 What must be present for photosynthesis to occur? chlorophyll light oxygen water A v v v v B v v x v Cc x v v x D x x x v key v =is necessary X =not necessary

1 marks

Answer: B

This question in 0653/12 Oct/Nov 2013

8 A healthy plant has been in the light. A leaf is taken from it, decolourised and then tested with iodine solution. What colour does the iodine solution become? A black B brick red C green D pale blue

1 marks

Answer: A

This question in 0653/12 Oct/Nov 2013

4 What are the main products of photosynthesis? A carbon dioxide + oxygen B carbon dioxide + water C simple sugars + oxygen D simple sugars + water

1 marks

Answer: C

This question in 0653/13 Oct/Nov 2013

13 Which is a greenhouse gas that plants help to remove from the atmosphere? A carbon dioxide B hydrogen C methane D oxygen

1 marks

Answer: A

This question in 0653/13 Oct/Nov 2013

4 The diagram shows a leaf from a plant kept in the dark for 48 hours. green area white area Which colours will be obtained if the leaf is then tested for starch with iodine solution? green area white area A blue-black blue-black B blue-black brown C brown blue-black D brown brown

1 marks

Answer: D

This question in 0653/11 May/June 2014

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

1 marks

Answer: C

This question in 0653/11 May/June 2014

3 The diagram shows a leaf from a plant kept in the dark for 48 hours. green area white area Which colours will be obtained if the leaf is then tested for starch with iodine solution? green area white area A blue-black blue-black B blue-black brown C brown blue-black D brown brown

1 marks

Answer: D

This question in 0653/13 May/June 2014

12 Which process absorbs carbon dioxide from the atmosphere? A combustion B decay C photosynthesis D respiration

1 marks

Answer: C

This question in 0653/13 May/June 2014

5 The diagram shows a section through part of a leaf. X The leaf is photosynthesising in bright light. What enters the leaf at X? A carbon dioxide B light C oxygen D water

1 marks

Answer: A

This question in 0653/11 May/June 2015

6 Diagram 1 shows a water plant exposed to sunlight. diagram 1 What change would take place if a black box is placed over the plant, as in diagram 2, and left for eight hours? diagram 2 A Carbon dioxide production would fall. B Oxygen production would fall. C Stomata would open wider. D Respiration would stop.

1 marks

Answer: B

This question in 0653/11 May/June 2015

1 Which process produces an element that is excreted? A fertilisation B photosynthesis C respiration D transpiration

1 marks

Answer: B

This question in 0653/13 May/June 2015

6 The diagram shows a section through a leaf. Where are there cells that contain the light-absorbing structures? A B C D

1 marks

Answer: C

This question in 0653/13 May/June 2015

8 Which word is missing from the equation for a chemical reaction which takes place in living cells? carbon dioxide + …… → oxygen + glucose A enzyme B fat C starch D water

1 marks

Answer: D

This question in 0653/13 May/June 2015

5 The diagram shows a section through a leaf. 1 2 3 Where does carbon dioxide enter the leaf and where does water leave? carbon dioxide water leaves enters A 1 2 B 1 3 C 3 1 D 3 3

1 marks

Answer: D

This question in 0653/13 Oct/Nov 2015

5 Which part of a leaf contains the pigment needed for photosynthesis? A cuticle B mesophyll cells C phloem cells D stomata

1 marks

Answer: B

This question in 0653/11 May/June 2016

5 Which word equation represents photosynthesis? A carbon dioxide + water → sugar + oxygen B oxygen + water → sugar + carbon dioxide C sugar + carbon dioxide → water + oxygen D sugar + oxygen → water + carbon dioxide

1 marks

Answer: A

This question in 0653/12 May/June 2016

9 The diagram shows apparatus containing a seedling fixed to a platform. rotates four times per hour light shoot of seedling damp platform cotton wool motor The platform is rotated four times every hour, for two days. The motor is then switched off and the platform is stationary for the next two days. During all four days the light source remains stationary. What is the appearance of the seedling after the four days? A B C D

1 marks

Answer: C

This question in 0653/11 Oct/Nov 2016

12 A farmer chops down a tree to provide firewood. He gets warm when chopping down the tree. The farmer then burns the wood to keep warm. What is the original source of the energy that warms the farmer in both cases? A photosynthesis by the tree growing the wood B respiration C the match used to light the fire D the Sun

1 marks

Answer: D

This question in 0653/12 Oct/Nov 2016

4 What must be present for photosynthesis to occur? chlorophyll light oxygen water A v v v v B v v x v Cc x v v x D x x x Jv key J/ =is necessary X = not necessary

1 marks

Answer: B

This question in 0653/12 Feb/March 2017

5 What are the products of photosynthesis? A carbohydrates + oxygen B carbohydrates + water C carbon dioxide + oxygen D carbon dioxide + water

1 marks

Answer: A

This question in 0653/11 May/June 2017

5 What are the products of photosynthesis? A carbohydrates + oxygen B carbohydrates + water C carbon dioxide + oxygen D carbon dioxide + water

1 marks

Answer: A

This question in 0653/12 May/June 2017

5 What are the products of photosynthesis? A carbohydrates + oxygen B carbohydrates + water C carbon dioxide + oxygen D carbon dioxide + water

1 marks

Answer: A

This question in 0653/13 May/June 2017

5 Plants carry out a process called photosynthesis. What is the word equation for photosynthesis? A carbon dioxide + carbohydrates → oxygen + water B carbon dioxide + water → oxygen + carbohydrates C oxygen + carbohydrates → carbon dioxide + water D oxygen + water → carbon dioxide + carbohydrates

1 marks

Answer: B

This question in 0653/12 Oct/Nov 2017

4 The list shows chemicals that are important to a plant. 1 carbon dioxide 2 nitrates 3 oxygen 4 water Which chemicals does a plant use in photosynthesis? A 1, 2 and 4 B 1 and 2 only C 1 and 4 only D 3 and 4 only

1 marks

Answer: C

This question in 0653/13 Oct/Nov 2017

12 The diagram shows part of the carbon cycle. Which arrow represents a process that releases oxygen into the atmosphere? carbon dioxide in the air B A carbohydrates in dead organic matter C D death carbohydrates in animals death carbohydrates in green plants

1 marks

Answer: C

This question in 0653/12 Feb/March 2018

4 Which two chemical substances are required for photosynthesis? A carbon dioxide and glucose B glucose and oxygen C oxygen and water D water and carbon dioxide

1 marks

Answer: D

This question in 0653/11 May/June 2018

4 Which two chemical substances are required for photosynthesis? A carbon dioxide and glucose B glucose and oxygen C oxygen and water D water and carbon dioxide

1 marks

Answer: D

This question in 0653/12 May/June 2018

4 Which two chemical substances are required for photosynthesis? A carbon dioxide and glucose B glucose and oxygen C oxygen and water D water and carbon dioxide

1 marks

Answer: D

This question in 0653/13 May/June 2018

5 The diagram shows a water plant surrounded by a black box. lightproof black box water plant Which change takes place if the black box is removed? A Oxygen production increases. B Respiration stops. C Stomata close. D Water uptake decreases.

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2018

5 The diagram shows apparatus set up to investigate photosynthesis. lightproof black box 1 2 3 4 bright bright water light light water beetle water plant In which test-tubes will the carbon dioxide concentration in the water decrease? test-tube 1 2 3 4 A no no yes no B no no yes yes C yes no no no D yes yes no no

1 marks

Answer: A

This question in 0653/12 Oct/Nov 2018

3 The diagram shows some cells in a leaf of a green plant. In which layer of cells does most photosynthesis occur? sunlight D A B C gases enter

1 marks

Answer: A

This question in 0653/12 Feb/March 2019

13 A farmer chops down a tree to provide firewood. He gets warm when chopping down the tree. The farmer then burns the wood to keep warm. What is the original source of the energy that warms the farmer in both cases? A photosynthesis by the tree growing the wood B respiration C the match used to light the fire D the Sun

1 marks

Answer: D

This question in 0653/12 Feb/March 2019

8 Diagram 1 shows a growing seedling after the first few days’ growth. The seedling was then rotated, held in the position shown in diagram 2 and placed in the dark for three days. diagram 1 diagram 2 What is the shape of the seedling three days later? A B C D

1 marks

Answer: B

This question in 0653/12 May/June 2019

3 Which substances are used and produced during photosynthesis? substances used substances produced A carbon dioxide and glucose oxygen and water B carbon dioxide and water glucose and oxygen C glucose and oxygen carbon dioxide and water D oxygen and water carbon dioxide and glucose

1 marks

Answer: B

This question in 0653/13 May/June 2019

8 Diagram 1 shows a growing seedling after the first few days’ growth. The seedling was then rotated, held in the position shown in diagram 2 and placed in the dark for three days. diagram 1 diagram 2 What is the shape of the seedling three days later? A B C D

1 marks

Answer: B

This question in 0653/13 May/June 2019

9 The diagram shows the shoots of a tray of seedlings in a box. Light enters the box as shown. box light entering through hole shoots in the box tray Which diagram shows the phototropic response of the shoots after 48 hours? A B C D

1 marks

Answer: D

This question in 0653/12 Oct/Nov 2019

9 The diagram shows the shoots of a tray of seedlings in a box. Light enters the box as shown. box light entering through hole shoots in the box tray Which diagram shows the phototropic response of the shoots after 48 hours? A B C D

1 marks

Answer: D

This question in 0653/13 Oct/Nov 2019

13 Which row shows the effects of deforestation? concentration of amount of carbon dioxide photosynthesis in atmosphere A less more B less less C more less D more more

1 marks

Answer: A

This question in 0653/13 Oct/Nov 2019

2 Which substance is required for photosynthesis to occur? A chlorophyll B glucose C haemoglobin D oxygen

1 marks

Answer: A

This question in 0653/11 May/June 2020

5 What is necessary for photosynthesis? 1 carbon dioxide 2 chlorophyll 3 glucose 4 light 5 oxygen 6 water A 1, 2, 4 and 6 B 1, 3, 4 and 6 C 2, 3, 4 and 5 D 3, 4, 5 and 6

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2020

6 Corals are animals found in the sea. They can only survive if they live in a close relationship with algae. Algae can photosynthesise. What do the algae produce that corals can use to survive? carbon dioxide chlorophyll glucose oxygen v v x x 00 WwW > v x x x v v x x v Kx 4

1 marks

Answer: D

This question in 0653/12 Oct/Nov 2020

4 The flow diagram shows the stages in testing a green leaf for starch. 1, 2, 3 and 4 are all liquids. 4 iodine solution white tile hot water 1 2 3 boiling water boiling alcohol to warm water to kill the leaf remove the chlorophyll to wash the leaf What are the colours of liquids 2 and 4 for a leaf that contains starch? 2 4 A green blue / black B colourless brown C colourless blue / black D green brown

1 marks

Answer: A

This question in 0653/11 May/June 2021

13 Which process takes carbon dioxide out of the air? A combustion B decomposition C photosynthesis D plant respiration

1 marks

Answer: C

This question in 0653/11 May/June 2021

5 The flow diagram shows the stages in testing a green leaf for starch. 1, 2, 3 and 4 are all liquids. 4 iodine solution white tile hot water 1 2 3 boiling water boiling alcohol to warm water to kill the leaf remove the chlorophyll to wash the leaf What are the colours of liquids 2 and 4 for a leaf that contains starch? 2 4 A green blue / black B colourless brown C colourless blue / black D green brown

1 marks

Answer: A

This question in 0653/12 May/June 2021

4 The flow diagram shows the stages in testing a green leaf for starch. 1, 2, 3 and 4 are all liquids. 4 iodine solution white tile hot water 1 2 3 boiling water boiling alcohol to warm water to kill the leaf remove the chlorophyll to wash the leaf What are the colours of liquids 2 and 4 for a leaf that contains starch? 2 4 A green blue / black B colourless brown C colourless blue / black D green brown

1 marks

Answer: A

This question in 0653/13 May/June 2021

13 Which process takes carbon dioxide out of the air? A combustion B decomposition C photosynthesis D plant respiration

1 marks

Answer: C

This question in 0653/13 May/June 2021

4 The equation for photosynthesis is shown. carbon dioxide + water  X + oxygen What does X represent? A chlorophyll B glucose C light D magnesium

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2021

9 A student sets up an experiment to investigate phototropism in a shoot. light box growing shoot Which diagram shows the growth of the shoot after five days? A B C D

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2021

4 The chemical reactions in photosynthesis depend on enzymes. Which graph shows the effect of temperature on the rate of these reactions? A B rate of rate of photosynthesis photosynthesis temperature temperature C D rate of rate of photosynthesis photosynthesis temperature temperature

1 marks

Answer: C

This question in 0653/12 Feb/March 2022

5 A plant that lives in water is exposed to sunlight. After a short period of time, bubbles of gas are given off from the plant. Which gas do the bubbles contain, and which process produces this gas? gas process A carbon dioxide photosynthesis B carbon dioxide respiration C oxygen photosynthesis D oxygen respiration

1 marks

Answer: C

This question in 0653/11 May/June 2022

5 A plant that lives in water is exposed to sunlight. After a short period of time, bubbles of gas are given off from the plant. Which gas do the bubbles contain, and which process produces this gas? gas process A carbon dioxide photosynthesis B carbon dioxide respiration C oxygen photosynthesis D oxygen respiration

1 marks

Answer: C

This question in 0653/12 May/June 2022

5 A plant that lives in water is exposed to sunlight. After a short period of time, bubbles of gas are given off from the plant. Which gas do the bubbles contain, and which process produces this gas? gas process A carbon dioxide photosynthesis B carbon dioxide respiration C oxygen photosynthesis D oxygen respiration

1 marks

Answer: C

This question in 0653/13 May/June 2022

5 What is the word equation for photosynthesis? A carbon dioxide + water  glucose + oxygen B glucose + oxygen  carbon dioxide + water C oxygen + carbon dioxide  glucose + water D water + oxygen  glucose + carbon dioxide

1 marks

Answer: A

This question in 0653/12 Feb/March 2023

4 During photosynthesis, plants use energy from which source? A air B soil C water D Sun

1 marks

Answer: D

This question in 0653/13 May/June 2023

1 The diagram shows a plant absorbing carbon dioxide in order to carry out photosynthesis. carbon dioxide Which characteristic of all living organisms is this? A movement B nutrition C excretion D reproduction

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2023

9 The diagram shows a plant in a pot fixed to the side of a light-proof box. © wn ac What is shown by the stem of the plant? gravitropism phototropism v v 0 0O WwW > v x x v x x

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2023

12 Which type of organism makes glucose using energy from sunlight? A carnivore B consumer C herbivore D producer

1 marks

Answer: D

This question in 0653/11 Oct/Nov 2023

5 Which effects of magnesium deficiency on a plant are correct? amount of rate of growth chlorophyll A decreases decreases B decreases does not change C does not change decreases D does not change does not change

1 marks

Answer: A

This question in 0653/12 Feb/March 2024

4 Which substance found in plant cells is needed for photosynthesis? A chlorophyll B glucose C haemoglobin D starch

1 marks

Answer: A

This question in 0653/12 May/June 2024

5 What is the word equation for photosynthesis? A carbon dioxide + oxygen  glucose + water B carbon dioxide + water  glucose + oxygen C glucose + oxygen  carbon dioxide + water D glucose + water  carbon dioxide + oxygen

1 marks

Answer: B

This question in 0653/13 May/June 2024

4 The list shows some chemicals that are important to a plant. 1 carbon dioxide 2 nitrates 3 oxygen 4 water Which chemicals does a plant use in photosynthesis? A 1, 2 and 4 B 1 and 2 only C 1 and 4 only D 3 and 4

1 marks

Answer: C

This question in 0653/11 Oct/Nov 2024

4 A student investigates how light affects photosynthesis. gas measuring cylinder beaker glass funnel water aquatic plant X Y The student shines a light from point Y and measures the volume of gas produced in five minutes. Which gas is produced, and how does the rate of gas production change when the light is moved from Y to X? rate of gas gas produced production A carbon dioxide decreases B carbon dioxide increases C oxygen decreases D oxygen increases

1 marks

Answer: D

This question in 0653/12 Oct/Nov 2024

4 A student investigates how light affects photosynthesis. gas measuring cylinder beaker glass funnel water aquatic plant X Y The student shines a light from point Y and measures the volume of gas produced in five minutes. Which gas is produced, and how does the rate of gas production change when the light is moved from Y to X? rate of gas gas produced production A carbon dioxide decreases B carbon dioxide increases C oxygen decreases D oxygen increases

1 marks

Answer: D

This question in 0653/13 Oct/Nov 2024

6 The diagrams show four identical, well-watered plants in different environments. Each apparatus initially contains atmospheric air. Which plant will produce the most oxygen? A B colourless colourless glass cover glass cover solution to absorb carbon dioxide C D painted black painted black cover prevents cover prevents light from light from reaching plant reaching plant solution to absorb carbon dioxide

1 marks

Answer: A

This question in 0653/11 May/June 2025

5 Which substance is required for photosynthesis to occur? A chlorophyll B glucose C haemoglobin D oxygen

1 marks

Answer: A

This question in 0653/13 May/June 2025

5 Which process do plants use to manufacture carbohydrates using light energy? A absorption B photosynthesis C respiration D transpiration

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2025

6 A student investigates the need for chlorophyll in photosynthesis. white part of leaf contains no chlorophyll green part of leaf contains chlorophyll One leaf is placed in the dark and a second leaf is placed in the light for 48 hours. leaf left in dark leaf left in light P Q R S After 48 hours, the student tests the leaves for the presence of starch. Which row shows the results? parts with parts with starch present no starch present A P and Q R and S B P, Q and R S C R and S P and Q D S P, Q and R

1 marks

Answer: D

This question in 0653/12 Oct/Nov 2025

6 A student investigates the need for chlorophyll in photosynthesis. white part of leaf contains no chlorophyll green part of leaf contains chlorophyll One leaf is placed in the dark and a second leaf is placed in the light for 48 hours. leaf left in dark leaf left in light P Q R S After 48 hours, the student tests the leaves for the presence of starch. Which row shows the results? parts with parts with starch present no starch present A P and Q R and S B P, Q and R S C R and S P and Q D S P, Q and R

1 marks

Answer: D

This question in 0653/13 Oct/Nov 2025