Plant Physiology questions in NEET reward precise facts: which molecule accepts CO₂, where each pathway runs, and what each hormone does. This set covers photosynthesis, respiration, plant growth regulators and water relations, based on the NCERT Class 11 chapters.
How to practise: read each question and tap the option you think is correct. You will see right away whether you got it, along with a short explanation, and your score is tracked at the bottom of the screen. This set has 15 questions.
Topics covered in this set
- Light reaction, photosystems and photolysis
- Calvin cycle and C4 pathway
- Glycolysis, Krebs cycle and respiratory quotient
- Auxins, gibberellins and cytokinins
- Ethylene and abscisic acid
- Water potential and vernalisation
NEET Biology MCQs with answers and explanations
Q1. What is the primary CO₂ acceptor in the Calvin cycle of C3 plants?
a) Phosphoenolpyruvate (PEP)
b) Ribulose-1,5-bisphosphate (RuBP)
c) 3-Phosphoglycerate
d) Oxaloacetate
Q2. What is the first stable product of CO₂ fixation in C4 plants?
a) 3-Phosphoglycerate
b) RuBP
c) Oxaloacetic acid
d) Malic acid
Q3. What are the reaction centres of Photosystem I and Photosystem II?
a) P680 and P700
b) P680 and P680
c) P700 and P700
d) P700 and P680
Q4. Photolysis of water, which releases oxygen, is associated with:
a) Cyclic photophosphorylation
b) The Calvin cycle
c) Photosystem I
d) Photosystem II
Q5. Kranz anatomy, with large bundle sheath cells around vascular bundles, is characteristic of:
a) C4 plants
b) Algae
c) C3 plants
d) CAM plants only
Q6. How many ATP and NADPH molecules does the Calvin cycle need to make one glucose molecule?
a) 6 ATP and 6 NADPH
b) 3 ATP and 2 NADPH
c) 12 ATP and 18 NADPH
d) 18 ATP and 12 NADPH
Q7. Where does glycolysis take place and what is its net ATP gain per glucose?
a) Inner mitochondrial membrane, 36 ATP
b) Cytoplasm, 2 ATP
c) Cytoplasm, 4 ATP
d) Mitochondrial matrix, 2 ATP
Q8. Where does the Krebs (TCA) cycle occur in eukaryotes?
a) Cytoplasm
b) Outer mitochondrial membrane
c) Chloroplast stroma
d) Mitochondrial matrix
Q9. What is the respiratory quotient (RQ) when carbohydrates are fully oxidised?
a) 4.0
b) 0.9
c) 0.7
d) 1.0
Q10. Which plant hormone is responsible for apical dominance?
a) Gibberellin
b) Cytokinin
c) Ethylene
d) Auxin
Q11. Bolting (sudden internode elongation before flowering) in rosette plants such as cabbage is caused by:
a) Gibberellin
b) Ethylene
c) Auxin
d) Abscisic acid
Q12. Which hormone delays leaf senescence?
a) Abscisic acid
b) Auxin
c) Cytokinin
d) Ethylene
Q13. Which plant hormone is a gas and hastens fruit ripening?
a) Indole acetic acid
b) Cytokinin
c) Gibberellin
d) Ethylene
Q14. Which hormone causes stomatal closure during water stress?
a) Gibberellin
b) Cytokinin
c) Auxin
d) Abscisic acid
Q15. What is the water potential of pure water at standard temperature and atmospheric pressure?
a) Negative
b) Zero
c) One
d) Positive
Quick revision notes
- C3: RuBP accepts CO₂, first product 3-PGA; C4: PEP, first product OAA.
- PS I = P700, PS II = P680; photolysis at PS II.
- Calvin cycle per glucose: 18 ATP, 12 NADPH.
- RQ: carbohydrate 1, fat ~0.7, protein ~0.9.
- Auxin apical dominance; GA bolting; cytokinin delays senescence; ethylene ripening; ABA stomatal closure.
Frequently asked questions
Are these NEET previous year questions?
No. They are original questions based on the NCERT Class 11 Plant Physiology chapters.
Which plant physiology chapters are most important for NEET?
Photosynthesis in Higher Plants, Respiration in Plants and Plant Growth and Development carry most of the questions.
How can I remember plant hormone functions?
Link each hormone to one signature effect first, then add secondary effects.
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