IB Biology C1.3 Definitions

This page contains our IB Biology definitions for C1.3. By learning each one of these definitions, you will fully cover the content for IB Biology 'Photosynthesis'.
absorption spectrum

It is the wavelengths of electromagnetic waves an atom can absorb

chemiosmosis in photosynthesis

The process by which proton pumps use the energy of electrons to pump protons from the stroma into the thylakoid space to build a concentration gradient

photoactivation

The process by which chlorophyll reaction centers of photosystems absorb energy from light and their electrons become exited

photolysis

The process by which water is split into oxygen, protons, and electrons in the thylakoid space by an oxidized photosystem II after photoactivation

photophosphorylation

The process by which protons travel down the concentration gradient into the stroma via ATP synthase, which phosphorylates ADP into ATP

photosynthesis

The production of glucose and oxygen from light, CO2, and water, within the chloroplast

photosynthesis action spectrum

A spectrum that shows the rate of photosynthesis at different colors of light

thin layer chromatography

A process that can separate xantophyll, carotene, and chlorophyll a and b by solubility

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