Photosynthesis: Light and Dark Reactions - Case Studies

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This section uses realistic case studies and scenario-based problems to apply the concepts of light and dark reactions of photosynthesis. It is designed for Class 11–12 students, NEET aspirants, and undergraduate learners to strengthen analytical thinking and application of theoretical knowledge.

In this section, you will study:

  • Case studies based on variations in light intensity, wavelength, and duration

  • Analysis of CO₂ concentration, temperature, and water availability on photosynthesis

  • Comparative case studies involving C3, C4, and CAM plants

  • Situational problems on photophosphorylation and Calvin cycle efficiency

  • Case-based questions related to photorespiration and RuBisCO activity

  • Interpretation of experimental data, graphs, and observations

  • NCERT-based case studies, assertion–reason questions, and exam-oriented scenarios

The content is structured to improve concept application, enhance data interpretation skills, and prepare students for case-based and higher-order thinking questions in school examinations, NEET, and undergraduate assessments.

Develop the ability to analyze real-world and experimental situations by applying concepts of light and dark reactions with clarity and precision.

Q. In C4 plants, where does the initial carbon fixation occur?
  • A. In the mesophyll cells
  • B. In the bundle sheath cells
  • C. In the stroma
  • D. In the thylakoid membranes
Q. In C4 plants, where does the initial fixation of CO2 occur?
  • A. In the mesophyll cells
  • B. In the bundle sheath cells
  • C. In the stroma
  • D. In the thylakoid membranes
Q. What is the end product of the Calvin cycle?
  • A. Oxygen
  • B. Glucose
  • C. NADPH
  • D. ATP
Q. What is the main function of the Calvin cycle?
  • A. To produce ATP
  • B. To fix carbon dioxide
  • C. To absorb light
  • D. To release oxygen
Q. What is the role of water in the light reactions of photosynthesis?
  • A. Source of electrons
  • B. Source of carbon
  • C. Source of glucose
  • D. Source of oxygen
Q. What is the role of water in the light reactions?
  • A. To provide electrons
  • B. To produce glucose
  • C. To absorb light
  • D. To fix carbon
Q. What role does RuBisCO play in photosynthesis?
  • A. It absorbs light
  • B. It fixes carbon dioxide
  • C. It produces ATP
  • D. It generates oxygen
Q. Which of the following factors can affect the rate of photosynthesis?
  • A. Light intensity
  • B. Carbon dioxide concentration
  • C. Temperature
  • D. All of the above
Q. Which of the following statements about the light-dependent reactions is true?
  • A. They occur in the stroma
  • B. They produce ATP and NADPH
  • C. They do not require light
  • D. They fix carbon dioxide
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