photosynthesis

Question 1

what are the adaptations of a leaf for photosynthesis

Answer 1

• large surface area so absorbs as much sunlight as possible
  -arrangement of leaves on a plant minimises overlapping - so avoids the shadowing of one leaf by another
  -transparent cuticle and epidermis -let light through to the photosynthetic mesophyll beneath
  -numerous stomata -short diffusion pathway to mesophyll cells

Question 2

what is oxidation

Answer 2

• loss of electrons
  -loss of hydrogen
• gain of oxygen
• energy released

Question 3

what is reduction

Answer 3

• gain of electrons
  -loss of oxgyen
  -gain of hydrogen
  -energy taken in

Question 4

what does TP stand for

Answer 4

triose phosphate - never abreviate to TP in exams

Question 5

What is ATP required for in the light independent reaction

Answer 5

ATP is hydrolysed to release energy and this energy is used to reduce 2 molecules of gl

Question 6

what happens to the amount of GP when it is dark

Answer 6

when it is dark , the light dependent reaction cannot occur and therefore no ATP and reduced NADP are formed. this means GP cannot be reduced into Triose phosphate therefore the amount of GP present would increase

Question 7

why will the amount of GP everntually plateu

Answer 7

RuBp stops being converted into GP as there is no triose phosphate being formed and Rubp gets used up.