Photosynthesis

Question 1

Photoautotrophs

Answer 1

Organisms that use light as a source of energy to synthesise organic substances

Question 2

Pigment

Answer 2

Substance that absorbs light

Question 3

Explain what a cartenoid is and its two functions

Answer 3

An accessory pigment in the chloroplast that are yellow and orange and absorb violet and blue-green light. They lie other function is photo protection- absorbing and disspiating excessive light to not damage the chlorophyll and prevent light from interacting with oxygen forming reactive oxidative cells that are dangerous to the cell

Question 4

Photo system

Answer 4

A complex composed of a reaction center complex surrounded by several light harvesting complexes

Question 5

Cyclic electron flow

Answer 5

The alternative path that photoexcited electrons take, using PS I where electrons cycle back from ferredoxin to the cytochrome complex and from there continue on to P700 chlorophyll. No NADPH or oxygen is produced but ATP is

Question 6

Chemiosmosis

Answer 6

The ETC transforms redox energy into proton-motive force, potential energy stored in the form of an H+ gradient across a membrane. An ATP synthase complex couples the diffusion of hydrogen ions down their gradient to the phosphorylation of ADP forming ATP