Photosynthesis logoSubject: Biology    Exam: AIPMT / NEET-UG

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Important Concepts in Photosynthesis

Find notes, videos, important points and questions to practice on each of these concepts.

Most Important Concepts (Do or Die)
  • Electron Transport Chain

  • C3 Pathway

  • Hatch Slack Pathway

Important Concepts (Should Do)
  • Photosynthesis - Concept

  • Photosynthetic Pigments

  • Chlorophylls

  • Photosynthetic Unit

  • Photosystems

  • Photophosphorylation

  • Carbon Fixation

  • CAM Pathway

Not So Important Concepts (Do if you have time)
  • Absorption Spectrum

  • Phycobilins

  • Photorespiration

  • Factors Affecting Photosynthesis

  • Baterial Photosynthesis

  • Chemosynthesis

  • Translocation of Organic Nutrients

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Important Points

Energy absorbed is transmissible between pigments by resonance transfer, following the rule that such a transmission/passage would always by from a pigment with shorter absorption maximum (or lambda) to a pigment with longer lambda. Thus every photosystem (or pigment system) has only pigment molecule with longest maximum (like Chl a 700/P700 in PS I and Chl a 680/P680 in PS II) action as photoreaction center that exits as electron when sufficiently stimulated due to energy transfer by the neighbouring molecules of secondary/ accessory Pigments in an assembly of 300 molecules comprising each photosystem.

Low velocity of Calvin cycle is mostly because of the efficiency of RuBP - carboxylase (or Rubisco).
Under monochromatic illumination, photosynthesis is best in red light. In natural conditions however best photosynthesis would be under appropriately intense sunlight.
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