Notes for B4.2.3 Photosynthesis as the mode of nutrition - IB | RevisionDojo
B4.2.3 Photosynthesis as the mode of nutrition Notes
The Process of Photosynthesis and the Organisms That Perform It
Photosynthesis is the process where energy from sunlight is harnessed to fix carbon dioxide into organic compounds.
This includes sugars, amino acids, and other carbon-based molecules that form the basis of life.
Note
This process supports almost all life on Earth by fueling food chains and producing oxygen.
The Three Groups of Photosynthetic Organisms
Plants
Includes mosses, ferns, conifers, and flowering plants.
Plants are the dominant terrestrial photosynthesizers, playing a crucial role in capturing solar energy and converting it into chemical energy.
Eukaryotic Algae
Includes seaweeds that grow along rocky shores and unicellular algae like Chlorella.
These photosynthesizers dominate aquatic environments, producing significant amounts of oxygen and forming the base of marine ecosystems.
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Questions
Recap questions
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Question 1
Recap question
Photosynthesis is absent in Archaea. Which metabolic strategy best explains how archaeal species meet their energy needs instead?
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Which three organisms are considered photosynthetic?
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Note
Introduction to Photosynthesis
Photosynthesis is the process by which certain organisms convert light energy into chemical energy, storing it in the form of glucose.
It occurs in:
Chloroplasts in plants and algae
Specialized membranes in photosynthetic prokaryotes like cyanobacteria
These organisms are called autotrophs because they produce their own food from simple inorganic substances.
AnalogyThink of photosynthesis as a solar-powered kitchen where sunlight is used to cook a meal from basic ingredients.
DefinitionAutotrophsOrganisms that can produce their own food from inorganic substances using light or chemical energy.
ExamplePlants, algae, and certain bacteria are all examples of autotrophs that perform photosynthesis.
