NEET 2025 Preparation (Model Questions)
The NEET 2025 Model Question Paper is designed to align with the updated syllabus, covering Physics, Chemistry, and Biology from Classes 11 and 12. It emphasizes application-based and conceptual questions to test candidates’ problem-solving skills and comprehension. The paper follows the NCERT curriculum, ensuring relevance for students across various boards. It consists of 200 multiple-choice questions, with 180 to be answered, and a total score of 720 marks. Practicing model papers helps students familiarize themselves with the exam pattern, improve time management, and identify areas for improvement. This is a NEET 2025 Model Questions. The questions were taken from the topics such as Photosynthesis, Light Reaction, Photosystems etc.
NEET Old Papers | NEET Mock Tests | Biology Notes | NEET MCQs
1. What is the main role of photosystems in photosynthesis?
a) Producing oxygen
b) Absorbing light energy to make chemical energy
c) Breaking down glucose
d) Transporting nutrient
Answer: b) Absorbing light energy to make chemical energy
2. Where are photosystems located in plant cells?
a) Mitochondria
b) Cytoplasm
c) Chloroplasts
d) Nucleus
Answer: c) Chloroplasts
3. Which organisms use photosystems for photosynthesis?
a) Only plants
b) Plants and fungi
c) Plants, algae, and some bacteria
d) All living organisms
Answer: c) Plants, algae, and some bacteria
4. What are the two main parts of a photosystem?
a) Thylakoid and stroma
b) Antenna complex and reaction center
c) Pigments and ATP synthase
d) Membranes and chlorophyll
Answer: b) Antenna complex and reaction center
5. What is the primary function of the antenna complex?
a) Splitting water molecules
b) Producing ATP
c) Capturing light energy
d) Reducing NADP+
Answer: c) Capturing light energy
6. What happens in the reaction center of a photosystem?
a) Oxygen is released
b) Light energy is converted into electron flow
c) ATP is synthesized
d) Pigments are replenished
Answer: b) Light energy is converted into electron flow
7. How many types of photosystems are there?
a) One
b) Two
c) Three
d) Four
Answer: b) Two
8. Which wavelength of light does Photosystem I (PSI) absorb best?
a) 680 nm
b) 700 nm
c) 450 nm
d) 560 nm
Answer: b) 700 nm
9. What is the primary role of Photosystem II (PSII)?
a) Reducing NADP+
b) Producing oxygen by splitting water
c) Absorbing green light
d) Synthesizing ATP
Answer: b) Producing oxygen by splitting water
10. What happens to electrons in the reaction center when they absorb light energy?
a) They remain stationary
b) They move to a lower energy state
c) They get excited to a higher energy state
d) They combine with protons
Answer: c) They get excited to a higher energy state
11. What does the electron transport chain do with the excited electrons?
a) Stores them in the stroma
b) Converts them into protons
c) Transfers them to PSI or NADP+
d) Recycles them into PSII
Answer: c) Transfers them to PSI or NADP+
12. What two energy carriers are produced by the light-dependent reactions?
a) ATP and NADPH
b) ADP and NAD+
c) ATP and FADH2
d) NADH and oxygen
Answer: a) ATP and NADPH
13. What is the main function of the antenna complex in photosystems?
a) To capture light energy
b) To split water molecules
c) To produce ATP
d) To release oxygen
Answer: a) To capture light energy
14. Which molecules in the antenna complex absorb light energy?
a) Chlorophyll and carotenoids
b) NADPH and ATP
c) Oxygen and water
d) Glucose and proteins
Answer: a) Chlorophyll and carotenoids
15. What happens after the antenna complex absorbs light energy?
a) The energy is transferred to the stroma
b) The energy is passed to the reaction center
c) The energy is stored in ATP
d) The energy is lost as heat
Answer: b) The energy is passed to the reaction center
16. What is produced when PSII splits water molecules?
a) ATP and NADPH
b) Oxygen, protons, and electrons
c) Glucose and oxygen
d) NADH and ATP
Answer: b) Oxygen, protons, and electrons
17. At which wavelength does Photosystem II (PSII) absorb light best?
a) 680 nm
b) 700 nm
c) 450 nm
d) 500 nm
Answer: a) 680 nm
18. What is the role of the electron transport chain in photosynthesis?
a) To synthesize glucose
b) To transport electrons and generate ATP
c) To split water molecules
d) To re-energize the reaction center
Answer: b) To transport electrons and generate ATP
19. What happens as electrons move through the electron transport chain?
a) ATP is used to split water
b) Energy is released, pumping protons into the thylakoid lumen
c) Oxygen is released
d) Electrons are recycled in the antenna complex
Answer: b) Energy is released, pumping protons into the thylakoid lumen
20. What is created by the movement of protons into the thylakoid lumen?
a) NADPH
b) A proton gradient
c) ATP synthase
d) Water molecules
Answer: b) A proton gradient
21. What happens to the electrons after they are re-energized by PSI?
a) They are transferred to the electron transport chain
b) They are passed to NADP+ to form NADPH
c) They are used to produce oxygen
d) They are stored in the thylakoid membrane
Answer: b) They are passed to NADP+ to form NADPH
22. What is the role of NADPH in photosynthesis?
a) To store light energy
b) To help produce ATP
c) To reduce NADP+
d) To provide electrons for the Calvin cycle
Answer: d) To provide electrons for the Calvin cycle
23. What is the “Z-scheme” in photosynthesis?
a) A pathway for cyclic electron flow
b) A model of the electron transport chain
c) A method for splitting water molecules
d) A sequence of events involving both PSII and PSI
Answer: d) A sequence of events involving both PSII and PSI
24. What is the purpose of the coordination between PSII and PSI?
a) To produce ATP
b) To ensure efficient light absorption
c) To generate both NADPH and ATP for the Calvin cycle
d) To split water molecules
Answer: c) To generate both NADPH and ATP for the Calvin cycle
25. Which photosystem starts the electron flow in photosynthesis?
a) PSI
b) PSII
c) ATP synthase
d) Antenna complex
Answer: b) PSII
26. What happens in non-cyclic electron flow?
a) Electrons move from water to NADP+
b) Electrons cycle back through PSI
c) ATP is produced but no NADPH is formed
d) NADPH is produced without ATP
Answer: a) Electrons move from water to NADP+
27. What does cyclic electron flow involve?
a) Both PSI and PSII
b) Only PSI
c) Only PSII
d) Both ATP and NADPH synthesis
Answer: b) Only PSI
28. Why does cyclic electron flow occur?
a) To generate NADPH only
b) To produce more ATP when needed
c) To release oxygen
d) To reduce carbon dioxide
Answer: b) To produce more ATP when needed
29. What is photophosphorylation?
a) The process of splitting water
b) The production of glucose
c) The process of making ATP using light energy
d) The formation of NADPH
Answer: c) The process of making ATP using light energy
30. Which enzyme is responsible for ATP synthesis in photophosphorylation?
a) ATP synthase
b) Rubisco
c) NADP+ reductase
d) Photosystem I
Answer: a) ATP synthase
31. Which type of photophosphorylation produces both ATP and NADPH?
a) Cyclic
b) Non-cyclic
c) Both types
d) Neither type
Answer: b) Non-cyclic
32. Which type of photophosphorylation only produces ATP?
a) Cyclic
b) Non-cyclic
c) Both types
d) Neither type
Answer: a) Cyclic
33. What do the light-dependent reactions of photosynthesis produce?
a) Glucose
b) Oxygen, ATP, and NADPH
c) NADH and oxygen
d) ATP and carbon dioxide
Answer: b) Oxygen, ATP, and NADPH
34. What is the role of NADPH in the Calvin cycle?
a) To supply energy for ATP synthesis
b) To provide electrons for reducing carbon dioxide
c) To split water molecules
d) To absorb light energy
Answer: b) To provide electrons for reducing carbon dioxide
35. Which of the following is a by-product of the light-dependent reactions?
a) Carbon dioxide
b) Water
c) Oxygen
d) Glucose
Answer: c) Oxygen
36. What role does the proton gradient play in photosynthesis?
a) It helps produce NADPH
b) It helps produce ATP
c) It splits water molecules
d) It reduces carbon dioxide
Answer: b) It helps produce ATP
37. Which type of electron flow does not involve the splitting of water?
a) Non-cyclic electron flow
b) Cyclic electron flow
c) Both types of electron flow
d) Neither type of electron flow
Answer: b) Cyclic electron flow
38. In non-cyclic electron flow, where do the electrons ultimately end up?
a) Back in the electron transport chain
b) In NADPH
c) In the antenna complex
d) In the proton gradient
Answer: b) In NADPH
39. What is the purpose of NADPH produced in photosynthesis?
a) To help form oxygen
b) To power the Calvin cycle
c) To transport protons
d) To generate ATP
Answer: b) To power the Calvin cycle
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