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VITEEE Photosynthesis in Higher Plants — practice questions

Explore 13 free Photosynthesis in Higher Plants questions in VITEEE Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Photosynthesis in Higher Plants questions and exercises with answers

Showing questions 1–13 of 13.

O₂ released in photosynthesis comes from:Read the answer and worked solution →Chlorophyll structure contains:Read the answer and worked solution →Photosystem I contains reaction center:Read the answer and worked solution →Calvin cycle (C₃ pathway) occurs in:Read the answer and worked solution →In C₃ cycle, first stable product is:Read the answer and worked solution →How many CO₂, ATP, NADPH needed to make one glucose via Calvin cycle?Read the answer and worked solution →Number of ATP and NADPH consumed in Calvin cycle PER turn (per CO₂ fixed):Read the answer and worked solution →Most plants are:Read the answer and worked solution →In photolysis of water:Read the answer and worked solution →During photosynthesis, ATP is produced primarily by:Read the answer and worked solution →Maximum photosynthesis occurs at:Read the answer and worked solution →Photosynthesis in outlineRead the answer and worked solution →Taken in or given out?Read the answer and worked solution →

Worked practice questions

O₂ released in photosynthesis comes from:

  1. Atmosphere
  2. Glucose
  3. CO₂
  4. Water (H₂O) — proven by ¹⁸O labeling experiments
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Correct answer: D. Water (H₂O) — proven by ¹⁸O labeling experiments

Ruben & Kamen experiments with ¹⁸O: labeled water release labeled O₂ labeled CO₂ did not. Confirmed van Niel hypothesis (originally proposed from sulfur bacteria using H₂S instead of H₂O). H₂O is split (photolysis at OEC of PSII) → 2 H⁺ + 2 e⁻ + ½ O₂.

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Chlorophyll structure contains:

  1. Zinc
  2. Calcium
  3. Mg²⁺ at center of porphyrin ring with long phytol tail
  4. Iron
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Correct answer: C. Mg²⁺ at center of porphyrin ring with long phytol tail

**Chlorophyll:** porphyrin ring (4 pyrroles) with Mg²⁺ at center (cf. heme has Fe). Long phytol hydrocarbon tail anchors in thylakoid membrane. The Mg-porphyrin ring system is responsible for absorbing light. Slight differences between Chl a (methyl) and Chl b (formyl group) at one position shift the absorption spectrum.

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Photosystem I contains reaction center:

  1. P680
  2. P700 (absorbs at 700 nm)
  3. P420
  4. P800
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Correct answer: B. P700 (absorbs at 700 nm)

**PS I:** reaction center P700. After excitation, P700* passes electron to ferredoxin → NADP+ reductase → produces NADPH. Light hit PS I → P700+ becomes strong oxidant gets re-reduced by PC (electrons from PSII). **Z-scheme:** PSII pushes electrons up to PSI, then to NADP+.

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