Question

1) Compare and contrast ender and exergonic reactions:

2) Describe photosynthesis as a redox reaction

Answer 1

Endergonic reaction	Exergonic reaction
Non-spontaneous reactions	spontaneous reaction
Energy is used	energy is released
delta G > 0	delta G < 0
The substrate is at low energy state	the substrate is at high energy state

Ans-2- photosynthesis is a redox reaction or an oxidation-reduction reaction in which reactant transfers an electron to another compound, The electron-donating compound is known as a reducing agent (H2O) and get oxidized upon donating electrons while electron gaining compound is known as an oxidizing agent (NADPH) and get reduced upon recieving electrons. So the oxidation and reduction occurs togather thats why photosynthesis is a redox reaction.