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NEET UG Unit 8L: Biomes, Primary Productivity & Ecosystem Energetics — practice questions — page 2

Explore 34 free Unit 8L: Biomes, Primary Productivity & Ecosystem Energetics questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 8L: Biomes, Primary Productivity & Ecosystem Energetics questions and exercises with answers

Showing questions 31–34 of 34.

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 stages of the Calvin cycle in order areRead the answer and worked solution →

Worked practice questions

C4 plants lack photorespiration because

  1. Photorespiration is light-dependent only
  2. C4 plants have no light reactions at all
  3. Bundle sheath cells concentrate CO2 around RuBisCO
  4. RuBisCO is absent in C4 plants altogether
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Correct answer: C. Bundle sheath cells concentrate CO2 around RuBisCO

C4 plants use PEP carboxylase in mesophyll to grab CO2 and shuttle it as malate/aspartate to bundle sheath cells, where it is released as concentrated CO2 around RuBisCO. High CO2:O2 ratio suppresses oxygenase activity.

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Blackman's Law of Limiting Factors states that

  1. The factor in least supply limits the rate
  2. All factors equally limit the process
  3. Only light limits photosynthesis ever
  4. Only CO2 limits photosynthesis ever
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Correct answer: A. The factor in least supply limits the rate

**Blackman (1905):** in a multi-factor process, the rate is set by the factor nearest its minimum value. In photosynthesis, light may saturate at 10%, then CO2 or temperature takes over as the limiting factor.

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In the Z-scheme, electrons removed from PS II are replenished by

  1. Splitting of water at the OEC site
  2. Cyclic transfer back from PS I always
  3. NADPH oxidation at the stroma side
  4. ATP hydrolysis at the membrane
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Correct answer: A. Splitting of water at the OEC site

Oxygen-evolving complex (OEC, water-splitting) on the lumen side of PS II strips electrons from H2O, giving 4H+ + O2 per 2 water. These electrons replace the ones boosted out of P680 by photon absorption.

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