Here are some past questions related to photosynthesis, focusing on the light and dark stages. These questions are designed to reflect the kind of material that could be found in WAEC, GCE, or NECO exams. Note that the specifics of the questions (such as years and question numbers) are illustrative, as I can't provide direct references to proprietary exam questions:
Photosynthesis: Light and Dark Stages Questions
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Question: In which part of the chloroplast do the light reactions of photosynthesis predominantly take place?
- a) Stroma
- b) Thylakoid membranes
- c) Cytoplasm
- d) Ribosomes
- Answer: b) Thylakoid membranes
- Year: 2021, Q10
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Question: Which of the following molecules is produced during the light-dependent reactions of photosynthesis?
- a) Glucose
- b) Oxygen
- c) Carbon dioxide
- d) ATP
- Answer: b) Oxygen
- Year: 2020, Q5
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Question: What is the primary function of the dark reactions (Calvin cycle) in photosynthesis?
- a) To produce ATP
- b) To convert solar energy to chemical energy
- c) To fix carbon dioxide into organic molecules
- d) To release oxygen
- Answer: c) To fix carbon dioxide into organic molecules
- Year: 2019, Q15
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Question: During photosynthesis, which pigment is primarily responsible for absorbing light energy?
- a) Chlorophyll
- b) Carotenoids
- c) Xanthophylls
- d) Anthocyanins
- Answer: a) Chlorophyll
- Year: 2021, Q12
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Question: In the light-dependent reactions, the energy from sunlight is used to split water molecules. What is this process called?
- a) Photolysis
- b) Oxidation
- c) Reduction
- d) Respiration
- Answer: a) Photolysis
- Year: 2022, Q20
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Question: The primary function of ATP and NADPH produced in the light-dependent reactions is to:
- a) Provide energy for the Calvin cycle
- b) Produce glucose
- c) Transport water
- d) Absorb light energy
- Answer: a) Provide energy for the Calvin cycle
- Year: 2018, Q17
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Question: Which of the following factors does NOT affect the rate of photosynthesis?
- a) Light intensity
- b) Carbon dioxide concentration
- c) Soil pH
- d) Temperature
- Answer: c) Soil pH
- Year: 2020, Q9
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Question: What is the outcome of the light reactions of photosynthesis?
- a) Glucose is produced
- b) Oxygen and energy carriers are produced
- c) Water is produced
- d) Carbon dioxide is absorbed
- Answer: b) Oxygen and energy carriers are produced
- Year: 2021, Q11
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Question: During which stage of photosynthesis is carbon dioxide fixed?
- a) Light-dependent reactions
- b) Light-independent reactions
- c) Both light-dependent and light-independent reactions
- d) Neither stage
- Answer: b) Light-independent reactions
- Year: 2019, Q16
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Question: In which organelle does photosynthesis primarily occur?
- a) Mitochondria
- b) Nucleus
- c) Golgi apparatus
- d) Chloroplasts
- Answer: d) Chloroplasts
- Year: 2022, Q8
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Question: What is produced as a by-product of the light reactions of photosynthesis?
- a) Lactic acid
- b) Oxygen
- c) Nitrogen
- d) Hydrogen
- Answer: b) Oxygen
- Year: 2020, Q4
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Question: The Calvin cycle is also known as:
- a) Light-dependent reactions
- b) Light-independent reactions
- c) Aerobic respiration
- d) Fermentation
- Answer: b) Light-independent reactions
- Year: 2021, Q19
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Question: Which element is essential for the production of chlorophyll?
- a) Carbon
- b) Nitrogen
- c) Magnesium
- d) Oxygen
- Answer: c) Magnesium
- Year: 2019, Q6
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Question: The enzyme that catalyzes the fixation of carbon dioxide in the Calvin cycle is:
- a) ATP synthase
- b) RuBisCO
- c) NADP+
- d) Hexokinase
- Answer: b) RuBisCO
- Year: 2022, Q13
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Question: Which of the following best describes the role of water in photosynthesis?
- a) It is used in the Calvin cycle to produce glucose.
- b) It donates electrons in the light-dependent reactions.
- c) It is converted into carbon dioxide.
- d) It acts as a waste product.
- Answer: b) It donates electrons in the light-dependent reactions.
- Year: 2020, Q22
Note:
Please keep in mind that while these questions are indicative, they do not correspond to actual past exam questions from WAEC, GCE, or NECO. For real past questions, it’s important to refer to authorized exam resources or past question books.
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