RuBP,GP and TP levels Flashcards Preview

A- Level Biology - Photosynthesis > RuBP,GP and TP levels > Flashcards

Flashcards in RuBP,GP and TP levels Deck (14)
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1

Explain effect of GP and RuBP in light vs dark

  • In light GP and RuBP are at steady level
  • In light, RuBP converts to GP, converts back again
  • In darkness, GP accumulates and levels of RuBP falls
  • Reduced GP needed to convert to TP requires ATP and NADPH from LDR
  • Can't form TP
  • Can't regenerate RuBP
  • GP accumulates , RuBP levels fal

2

Explain why 

RuBP increases when concentration of carbon dioxide decrease?

 

 

There is less of carbon dioxide ro convert RuBP into GP

RuBP accumulates

 

3

Explain why GP and TP decrease when carbon dioxide increase?

 

 

GP is not made from RuBP but is being converted into TP and so being used up

GP runs out so less TP made 

But TP is still being converted to carbohydrate so TP is used up

4

Effect of changing light intensity

Why  RuBP and TP decrease when light intensity decreases?

GP is not being made into TP because of the lack of TP due to ATP and NADPH

TP converted into carbohydrate and RuBP which uses up TP

TP is being used up less RuBP can be made but RuBP is still being converted to GP

RuBP gets used up

5

Effect of changing light intensity

Why does decreasing light intensity increases GP

  • There is enough light to make ATP to convert GP into TP in high light intensity
  • But in low intensity the plant cannot covert as much GP to TP as there is not enough ATP and NADPH
  • Hence GP accumulates

6

What happens to TP when light intensity decreases?

  • Decreasing light intensity means less ATP and reduced NADP
  • Less TP made since ATP and NADPH neeeded to make TP from GP

7

What happens to GP when light intensity decreases?

  • More GP
  • RuBP can be converted to GP without ATP
  • Reduced NADP GP will not be used to make TP

8

What happens to RuBP when light intensity decreases?

  • Less ATP and reduced NADP
  • Less RuBP
  • RuBP used to make GP
  • RuBP not regenerated as GP to make TP
  • Which is needed to make more RuBP

9

What happens when carbon dioxide increases with TP?

TP increases

More CO2 is fixed so more GP is made so more TP

10

What happens when carbon dioxide concentration increases with GP?

  • As carbon dioxide increases
  • GP increases
  • More CO2
  • More GP made

11

What happens when carbon dioxide concentration increases with RuBP?

  • RuBP decreases
  • More CO2 fixed
  • More GP is made
  • More RuBP used up

12

What happens as temperature increases with TP?

TP increases

At high temp , TP decrease because Rubsico denature

Less CO2 fixed

Less GP made

Less TP made

13

What happens as temperature increases with GP?

More GP

At high temp - decrease

Enzyme rubscio denature so less carbon dioxide fixed

Less GP made

Less TP made

 

14

What happens when temperature increases with RuBP?

RuBP decrease because rate of enzyme action increases more RuBP used up

When Rubscio denature when high temp , less RuBP used up as CO2 not fixed