NEET Biology: Photosynthesis nutrition Practice Questions
14 free multiple-choice questions on Photosynthesis nutrition (Plant Physiology) for NEET Biology, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Which of the following represents the end product of the overall photosynthesis process?
Show answer & explanation
Correct answer: D — Glucose and Oxygen
Photosynthesis converts carbon dioxide and water into glucose (food/energy) and oxygen gas.
Q2. Which of the following molecules acts as the immediate energy carrier produced during the light-dependent reactions of photosynthesis, used to power the synthesis of glucose in the Calvin cycle?
Show answer & explanation
Correct answer: A — NADPH
NADPH (Nicotinamide adenine dinucleotide phosphate) is an energy-carrying molecule that transports high-energy electrons derived from the splitting of water during the light-dependent reactions to the Calvin cycle, where it provides the reducing power for carbon fixation.
Q3. What is the primary role of water (H₂O) in the process of photosynthesis?
Show answer & explanation
Correct answer: A — As the electron donor in the light reaction
In the light-dependent reactions, water molecules are split (photolysis) to release electrons, protons, and oxygen, which are essential for the subsequent energy production.
Q4. The Calvin cycle, which occurs in the stroma of the chloroplast, primarily uses which energy molecule to fix atmospheric carbon dioxide?
Show answer & explanation
Correct answer: D — ATP and NADPH
The Calvin cycle requires the energy stored in ATP and the reducing power provided by NADPH (products of the light reactions) to convert CO₂ into glucose.
Q5. Where does the light-dependent reaction take place in the chloroplast?
Show answer & explanation
Correct answer: B — Thylakoid membrane
Light-dependent reactions occur on the thylakoid membranes within the chloroplasts, where photosystems are embedded.
Q6. What is the primary gaseous byproduct released during the light-dependent reactions of photosynthesis?
Show answer & explanation
Correct answer: B — Oxygen
Oxygen is released as a byproduct when water is split during the light-dependent reactions.
Q7. Which of the following substances is the essential raw material used by plants to synthesize glucose during photosynthesis?
Show answer & explanation
Correct answer: A — Carbon Dioxide
Carbon dioxide (CO₂) and water (H₂O) are the primary raw materials that are converted into glucose during the process of photosynthesis.
Q8. The splitting of water molecules during the light-dependent reactions results in the release of which gas?
Show answer & explanation
Correct answer: D — Oxygen
Photolysis of water (H₂O) during the light reactions releases oxygen (O₂) as a byproduct.
Q9. Which pigment is primarily responsible for capturing light energy during the initial stage of photosynthesis?
Show answer & explanation
Correct answer: D — Chlorophyll
Chlorophyll is the green pigment essential for absorbing light energy to initiate the process of photosynthesis.
Q10. Which intermediate molecule is produced during the light-dependent reactions and used to power the subsequent synthesis reactions?
Show answer & explanation
Correct answer: B — ATP
The light-dependent reactions ultimately produce energy in the form of ATP and reducing power in the form of NADPH.
Q11. The primary site where the light-independent reactions (Calvin cycle) of photosynthesis occur in the chloroplast is the:
Show answer & explanation
Correct answer: B — Stroma
The Calvin cycle, which involves carbon fixation, takes place in the stroma of the chloroplast.
Q12. What is the main source of carbon atoms used by plants for the synthesis of glucose during photosynthesis?
Show answer & explanation
Correct answer: B — Carbon dioxide
Carbon dioxide (CO₂) from the atmosphere is the primary inorganic source of carbon atoms fixed during the Calvin cycle.
Q13. Which of the following reactions occurs during the light-dependent reactions of photosynthesis?
Show answer & explanation
Correct answer: C — Photophosphorylation
The light-dependent reactions involve the capture of light energy by chlorophyll, leading to the splitting of water and the generation of ATP and NADPH (photophosphorylation).
Q14. The overall balanced chemical equation for photosynthesis involves the conversion of which type of energy into chemical energy?
Show answer & explanation
Correct answer: A — Light energy to chemical energy
Photosynthesis converts light energy into chemical energy stored in glucose molecules.
Keep going — practice on Padhai Karlo
Padhai Karlo gives you unlimited NEET practice: chapter-wise questions, timed quizzes, and full mock tests with an All-India Rank — free to start.
Get the free Android app →