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NEET UG Unit 1A: Biomes, Primary Productivity and Trophic Levels — practice questions

Explore 34 free Unit 1A: Biomes, Primary Productivity and Trophic Levels questions in NEET UG Environmental Science. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 1A: Biomes, Primary Productivity and Trophic Levels questions and exercises with answers

Showing questions 1–30 of 34.

Most plants are:Read the answer and worked solution →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 →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 →During photosynthesis, ATP is produced primarily by:Read the answer and worked solution →Maximum photosynthesis occurs at:Read the answer and worked solution →In a chloroplast, the light reactions take place in theRead the answer and worked solution →Which of the following is the MOST abundant pigment of higher plants?Read the answer and worked solution →Maximum absorption of light by chlorophyll a is in theRead the answer and worked solution →Oxygen evolved during photosynthesis comes fromRead the answer and worked solution →The Calvin cycle takes place in theRead the answer and worked solution →RuBisCO catalyses the carboxylation ofRead the answer and worked solution →The first stable product of the C3 (Calvin) pathway isRead the answer and worked solution →Light saturation in photosynthesis typically occurs atRead the answer and worked solution →Joseph Priestley's classic experiment with a mouse and a candle in a bell jar demonstrated thatRead the answer and worked solution →The reaction centre of Photosystem I isRead the answer and worked solution →The non-cyclic electron flow (Z-scheme) producesRead the answer and worked solution →Cyclic photophosphorylation involvesRead the answer and worked solution →Splitting of water (photolysis) is associated withRead the answer and worked solution →To synthesise one molecule of glucose, the Calvin cycle usesRead the answer and worked solution →Kranz anatomy is found inRead the answer and worked solution →In C4 plants, the primary CO2 acceptor isRead the answer and worked solution →Photorespiration is theRead the answer and worked solution →C4 plants lack photorespiration becauseRead the answer and worked solution →Blackman's Law of Limiting Factors states thatRead the answer and worked solution →In the Z-scheme, electrons removed from PS II are replenished byRead the answer and worked solution →The C4 pathway is also known as theRead the answer and worked solution →

Worked practice questions

Most plants are:

  1. C4
  2. C3 — about 85% of all plants; includes most temperate crops
  3. CAM
  4. Mixed
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Correct answer: B. C3 — about 85% of all plants; includes most temperate crops

**C3:** ~85% of plant species. Includes wheat, rice, barley, oats, peanut, soy, cotton. **C4:** ~3% (but include important crops — maize, sugarcane, sorghum). **CAM:** ~10% (mostly desert succulents). C4/CAM evolved multiple times independently from C3.

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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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