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NEET UG Unit 1A: Biomes, Primary Productivity and Trophic Levels — practice questions — page 2

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 31–34 of 34.

In C₃ cycle, first stable product is:Read the answer and worked solution →Photosynthesis takes place primarily in theRead the answer and worked solution →In photolysis of water:Read the answer and worked solution →The stages of the Calvin cycle in order areRead the answer and worked solution →

Worked practice questions

In C₃ cycle, first stable product is:

  1. 3-Phosphoglycerate (3-PGA, 3-carbon)
  2. 6-carbon intermediate
  3. Glucose
  4. RuBP
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Correct answer: A. 3-Phosphoglycerate (3-PGA, 3-carbon)

C₃ pathway named after 3C first stable product (3-PGA). The 6C intermediate from CO₂ + RuBP is unstable, immediately splits into two 3-PGA. Two 3-PGAs from each CO₂ fixation. Six fixations needed to make 1 glucose.

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Photosynthesis takes place primarily in the

  1. Root cortex cells of plants
  2. Xylem tissue of mature stems
  3. Phloem tissue of mature stems
  4. Mesophyll cells of green leaves
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Correct answer: D. Mesophyll cells of green leaves

Mesophyll cells of green leaves are the primary site of photosynthesis. Other green tissues (young stems, sepals) also contribute. The chloroplasts within mesophyll cells house the photosynthetic machinery.

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In photolysis of water:

  1. 1 O₂ from 1 H₂O
  2. No O2 from water
  3. Random
  4. 2 H₂O → 4 H+ + 4 e- + O₂
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Correct answer: D. 2 H₂O → 4 H+ + 4 e- + O₂

**Water splitting at OEC:** 2 H₂O → 4 H+ + 4 e- + O₂. Requires 4 successive photons absorbed by PSII to advance OEC through 5 oxidation states. 4 protons go to thylakoid lumen (contributing to gradient). 4 electrons replace those lost from P680. O₂ is byproduct.

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