Photosynthesis in Higher Plants Test - 4

ATP is synthesized by cells (in mitochondria and chloroplasts) is named phosphorylation.

The work of Melvin Calvin is the discovery, the first CO₂ fixation product was a 3-carbon organic acid. He also contributed to working out the complete biosynthetic pathway; hence it was called Calvin cycle.

The light dependent transfer of electrons by chloroplasts in photosynthesis that results in the cleavage of water molecule and liberation of oxygen is called Hill reaction. Hill reaction required ferrricynide.

In PS I the reaction centre chlorophyll a has an absorption peak at 700 nm, hence is called P700.

This is achieved by electrons available due to splitting of water. The splitting of water is associated with the PS II; water is split into H+, [O] and electrons.

Light harvesting complexes (LHC) within the Photosystem I (PS I) and Photosystem II (PS II). These are named in the sequence of their discovery, and not in the sequence in which they function during the light reaction. The LHC are made up of hundreds of pigment molecules.

The single chlorophylla molecule forms the reaction centre. The reaction centre is different in both the photosystems. In PS I the reaction centre  is chlorophyll a.

Photosystem are light reactive centre to capture solar energy. Photosystem I is active below the wavelength of light below 780 nm. While photsystem II is active above 780 nm.

The process of which ATP is synthesised by cells (in mitochondria and chloroplasts) is named phosphorylation. Photophosphorylation is the synthesis of ATP fromADP and inorganic phosphate in the presenceof light.

The wavelength of light in which photosynthesis light reaction can occurs is called PAR ( photosynthetically active radiation). The wavelength of 400-700 nm is PAR for most of the plants.