BY4 - Photosynthesis Flashcards
What is the main photosynthetic tissue in a leaf?
Palisade mesophyll cells
Define the term photosynthesis
The conversion of light energy to chemical energy stored in glucose. It is the process in green plants by which carbon dioxide and water combine to form glucose and water using light energy.
What is the primary pigment?
Chlorophyll a
Name three accessory pigments
Chlorophyll b, carotene and xanthophyll
Define the term chromatography
Rf value = distance travelled by component / distance travelled by solvent
Define absorption spectrum
The absorption spectrum is a graph that shows how much light a particular pigment absorbs at each wavelength of light
What do accessory pigments do?
Absorb a wider range of wavelengths of light
Define action spectrum
Action spectrum is a graph that shows the rate of photosynthesis at different wavelengths of light
What is chlorophyll a known as?
It is known as the reaction centre
The pigments are organised into groups called _______? Where is this structure found?
Antenna complexes are found in the thylakoid membrane
Names the two types of antenna complexes
Photosystem I which absorbs light at 700nm wavelength and is at a higher energy level; photosystem II absorbs light at 600nm wavelength
What is the name of the flowering hormone?
Florigin
Define the term photoperiodism
The response of a plant to relative lengths of daylight and darkness. Flowering is influenced by the dark period
What does chromatography do?
It separates compounds within a mixture (by adsorption or relative solubility)
