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NEET UG Neet B04 — practice questions

Explore 11 free Neet B04 questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Neet B04 questions and exercises with answers

Showing questions 1–11 of 11.

Why is photosynthesis a form of autotrophic nutrition?Read the answer and worked solution →Why may extra light fail to increase photosynthesis at high light intensity?Read the answer and worked solution →During chloroplast ATP synthesis, H+ flows through ATP synthase from:Read the answer and worked solution →How do C4 plants minimise RuBisCO oxygenase activity?Read the answer and worked solution →Which conditions favour germination of most non-dormant seeds?Read the answer and worked solution →Plants need mineral nutrients during growth mainly to:Read the answer and worked solution →Which statement about temperature and plant growth is correct?Read the answer and worked solution →Which sequence follows normal plant cell development?Read the answer and worked solution →What permits exponential growth in a geometrically growing cell population?Read the answer and worked solution →Which growth regulator group has specific effects on cytokinesis?Read the answer and worked solution →Two leaves grow from 5 to 10 cm² and 50 to 55 cm² in one day. Their relative growth rates are:Read the answer and worked solution →

Worked practice questions

Why is photosynthesis a form of autotrophic nutrition?

  1. Light powers organic food synthesis from CO2
  2. Roots absorb ready-made sugars from soil
  3. Leaves obtain food by digesting insects
  4. Respiration converts starch into CO2
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Correct answer: A. Light powers organic food synthesis from CO2

Green plants use light energy to synthesise organic compounds from CO2. Making their own organic food is autotrophic nutrition.

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Why may extra light fail to increase photosynthesis at high light intensity?

  1. Water is no longer a reactant
  2. Another factor becomes limiting
  3. Chlorophyll stops absorbing all light
  4. The Calvin cycle needs no energy
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Correct answer: B. Another factor becomes limiting

At low light intensity, light limits CO2 fixation. At higher intensity, CO2 supply or another factor can limit the rate, so extra light has little effect.

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During chloroplast ATP synthesis, H+ flows through ATP synthase from:

  1. Stroma to cytoplasm
  2. Stroma to thylakoid lumen
  3. Thylakoid lumen to stroma
  4. Cytoplasm to chloroplast envelope
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Correct answer: C. Thylakoid lumen to stroma

Light-driven processes accumulate H+ in the thylakoid lumen. Return of H+ to the stroma through ATP synthase powers ATP formation.

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More Biology topics

Genetics and EvolutionReproduction in Organisms & PlantsBiotechnology and ApplicationsBiodiversity and ConservationThe Living World & Biological ClassificationNeural Control and Chemical CoordinationPrinciples of Inheritance and VariationAnimal Kingdom