3.5.1 Photosynthesis

Question 1

Stages of LIDR (3)

Answer 1

1. CO2 combines with RuBP> 2x GP (3C each), catalysed by enzyme rubisco
2. GP reduced > TP, using energy from ATP & accepting H from NADPH
3. some of TP converted > hexose sugar; rest used to regenerate RuBP

Question 2

Stages of LDR (4+3+5)

Answer 2

1. Chlorophyll absorbs light energy
2. This excites electrons (leading to photoionisation)
3. Photolysis of water > 1/2 O2, 2H+, 2e-
   
   • H+ converts NADP> NADPH
   • e- passed along EC proteins
   • o used in r/ leaves a waste
4. Chemiosmosis=
   
   • e- move along series of p embedded in T membrane, releasing energy
   • energy used to AT protons across chloroplast membrane
   • Electrochemical gradient created
   • Protons move through ATP synthase, resulting in ATP production
   • NADP reduced by e- & H+ > NADPH