photosynthesis

Question 1

explain the first stage of photosynthesis

Answer 1

light dependent stage - water splits into oxygen and hydrogen by light (photolysis) in order to obtain the hydrogen atoms for light independent stage
light energy is trapped by chlorophyll
takes place in thylakoid membranes

Question 2

what are the two stages of photosynthesis

Answer 2

light dependent stage
light independent stage

Question 3

chemical equation for light dependent stage

Answer 3

2H2O – 4H + 02

Question 4

explain what happens in the second stage

Answer 4

light independent stage the hydrogen from the light dependent stage combines carbon dioxide to form glucose
reduction reaction
neither light energy nor chlorophyll are needed
reaction takes place in stroma of chloroplast

Question 5

chemical equation for light independent stage

Answer 5

6C02 + 12H — C6H12O6 + 3O2

Question 6

what is the overall reaction for photosynthesis

Answer 6

6CO2 + 6H2O– C6H12O6 + 6O2

Question 7

what are the two redox reactions

Answer 7

oxidation and reduction

Question 8

explain oxidation

Answer 8

loss of electrons
addition of oxygen

Question 9

explain reduction

Answer 9

a gain of electrons
addition of hydrogen

Question 10

does photosynthesis occur in the night?

Answer 10

yes once enough hydrogen remains from the light dependent stage to be used in light dependent stage to reduce the carbon dioxide