Photosynthesis in Higher Plants Previous Year Questions — NEET Biology

3 past-year Photosynthesis in Higher Plants questions from NEET (Biology).

Q97 (2024)

How many ATP and NADPH molecules are required to make one molecule of glucose through the Calvin pathway?
  1. 18 ATP and 12 NADPH
  2. 6 ATP and 12 NADPH
  3. 24 ATP and 18 NADPH
  4. 12 ATP and 18 NADPH
### Related Formula $1 \text{ turn of Calvin Cycle (fixes } 1 \text{ CO}_2\text{)} = 3 \text{ ATP} + 2 \text{ NADPH}$ $1 \text{ Glucose } (C_6H_{12}O_6) = 6 \text{ turns of Calvin Cycle}$ ### Core Logic To synthesize 1 molecule of glucose, 6 turns of the Calvin cycle are required: $$\text{Total ATP} = 6 \times 3 = 18 \text{ ATP}$$ $$\text{Total NADPH} = 6 \times 2 = 12 \text{ NADPH}$$ ### Step 1: Calculation Hence, 18 ATP and 12 NADPH molecules are required for 1 glucose molecule. ### Pattern Recognition Calvin Cycle ratio per $CO_2$: 3 ATP : 2 NADPH. For 6 $CO_2$ (Glucose): $6 \times 3 = 18$ ATP and $6 \times 2 = 12$ NADPH. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Photosynthesis in Higher Plants

Q108 (2024)

Find the incorrect statement(s) about photosynthesis from the following: A. The water splitting complex is associated with PS I. B. $C_4$ plants use the $C_3$ pathway of $CO_2$ fixation as the main biosynthetic pathway. C. In $C_4$ plants, photorespiration does not occur. D. $C_3$ plants exhibit 'Kranz' anatomy. E. ATP synthesis in chloroplast occurs through chemiosmosis. Choose the answer from the options given below:
  1. B only
  2. A and D only
  3. B and C only
  4. B and E only
### Related Formula Water splitting complex = Associated with PS-II (lumen side). Kranz Anatomy = Exclusive feature of $C_4$ plants. ### Core Logic - Statement A is incorrect: Water splitting complex is located on the inner side of PS-II membrane, not PS-I. - Statement B is correct: Both $C_3$ and $C_4$ plants utilize Calvin cycle ($C_3$ pathway) for sugar synthesis. - Statement C is correct: $C_4$ plants avoid photorespiration by maintaining high $CO_2$ at RuBisCO site. - Statement D is incorrect: Kranz anatomy is shown by $C_4$ plants, not $C_3$ plants. - Statement E is correct: Photophosphorylation in chloroplasts occurs via chemiosmotic hypothesis. ### Step 1: Selection Incorrect statements are A and D. Option (2) is correct. ### Pattern Recognition Water splitting = PS II (A is False). Kranz anatomy = $C_4$ plants (D is False). Incorrect statements = A and D. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Photosynthesis in Higher Plants

Q132 (2024)

The enzyme required for carboxylation in the Calvin cycle is
  1. PEP carboxylase
  2. RuBP carboxylase - oxygenase
  3. Carboxypeptidase
  4. Hexokinase
### Related Formula $$\text{RuBP} + CO_2 + H_2O \xrightarrow{\text{RuBisCO}} 2 \times 3\text{-PGA}$$ ### Core Logic The first step of the Calvin cycle is carboxylation, where $CO_2$ is fixed onto Ribulose-1,5-bisphosphate (RuBP) catalyzed by the enzyme RuBP carboxylase-oxygenase (RuBisCO). ### Step 1: Selection The required enzyme is RuBP carboxylase - oxygenase. Option (2) is correct. ### Pattern Recognition Carboxylation enzyme in Calvin Cycle = RuBisCO (RuBP carboxylase-oxygenase). ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Photosynthesis in Higher Plants
Rankbit System
JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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