BrainIt

Respiration in Plants: NEET previous year questions

Every Respiration in Plants question from the official NEET papers on this site, with the answer and a worked solution.

The questions come from NEET 2026, Re-NEET 2026 and NEET 2020. Each shows its answer and solution when you open it, so you can attempt it first. For what the chapter covers and how NEET tests it, see the Respiration in Plants guide.

Practise on the CBT screen4 questions, 4 minutes, marked +4 / −1Download PDF3 pages, 0.7 MB, with answers and solutions

NEET 2026 · the full paper

  1. NEET 2026 · Q107

    2( C51H98C6)+145 O2→102 CO2+98 H2O+energy2(\,\mathrm{C}_{51}\mathrm{H}_{98}\mathrm{C}_{6}) + 145\,\mathrm{O}_{2} \rightarrow 102\,\mathrm{CO}_{2} + 98\,\mathrm{H}_{2}\mathrm{O} + \text{energy}

    The Respiratory Quotient (RQ) of a biomolecule used for respiration, as per the above equation would be :

    1. (1)

      Between 0.5 and 0.95

    2. (2)

      Less than 0.5

    3. (3)

      1.0

    4. (4)

      Between 1.25 and 2

    Answer and solution

    Answer: (1)

    The respiratory quotient is the ratio of the volume of CO2\mathrm{CO}_{2} evolved to the volume of O2\mathrm{O}_{2} consumed. From the equation, RQ=102145≈0.7RQ = \frac{102}{145} \approx 0.7, which lies between 0.5 and 0.95, the range typical when fats are respired. It is not 1.0 (which is for carbohydrates) nor greater than 1.

  2. NEET 2026 · Q128

    Match List-I with List-II

    List I (Process)

    List II (Location)

    P) Glycolysis

    I) Inner mitochondrial membrane

    Q) ETS

    II) Mitochondrial matrix

    R) Accumulation of protons

    III) Cytoplasm

    S) Krebs' cycle

    IV) Intermembrane space

    choose the correct answer from the options given below:

    1. (1)

      P-IV, Q-II, R-I, S-III

    2. (2)

      P-II, Q-III, R-IV, S-I

    3. (3)

      P-III, Q-I, R-IV, S-II

    4. (4)

      P-I, Q-IV, R-III, S-II

    Answer and solution

    Answer: (3)

    Glycolysis takes place in the cytoplasm (P-III), the electron transport system operates on the inner mitochondrial membrane (Q-I), protons accumulate in the intermembrane space during chemiosmosis (R-IV), and the Krebs' cycle runs in the mitochondrial matrix (S-II). This gives P-III, Q-I, R-IV, S-II.

Re-NEET 2026 · the full paper

  1. Re-NEET 2026 · Q109

    How many molecules of pyruvic acid are produced at the end of glycolysis from 206 molecules of glucose?

    1. (1)

      206

    2. (2)

      309

    3. (3)

      103

    4. (4)

      412

    Answer and solution

    Answer: (4)

    Glycolysis splits each six-carbon glucose into TWO three-carbon pyruvate molecules, so the yield is simply doubled: 206×2=412206 \times 2 = 412. The carbon count checks out, since 6=3+36 = 3 + 3. NCERT Class 11, Respiration in Plants.

NEET 2020 · the full paper

  1. NEET 2020 · Q20

    The number of substrate level phosphorylations in one turn of citric acid cycle is

    1. (1)

      One

    2. (2)

      Two

    3. (3)

      Three

    4. (4)

      Zero

    Answer and solution

    Answer: (1)

    In one turn of the citric acid cycle, there is one substrate-level phosphorylation event, which occurs during the conversion of succinyl-CoA to succinate. Chapter: Respiration in Plants.

Practise Respiration in Plants in the app: it brings back the questions you get wrong, so the chapter improves, not just your memory of these. Or try the free CBT mock. All chapters: NEET chapter-wise PYQs.

Questions

Are these the official NEET questions on Respiration in Plants?

Yes. They are the questions NTA set in each paper, in its wording. The solutions are written by BrainIt.

Something here wrong or out of date? Email hello@brainit.pro and a person will read it.