photosynthesis

Question 1

What happens in the light dependent reaction of photosynthesis?

11

Answer 1

1) light energy enters the thylakoid
2) excites e- in chlorophyll
3) e- are emitted
4) energy is released
5) as they move along the ETC
6) via a series of redox reactions
7) an electrochemical gradient of H+ is formed
8) diffuse thru ATP synthase via chemiosmosis
9) ADP+Pi=ATP
10) NADP is reduced
11) photolysis of water replenishes e- of chlorophyll

Question 1

Why not use make ATP with photosynthesis instead of respiration?

3

Answer 1

1) ATP cant move cell to cell
2) in the dark, no photosynthesis so no ATP
3) plants use more ATP than made in photosynthesis

Question 2

Describe what happens in the photolysis of water

2

Answer 2

1) water forms H ions and e-
2) O2 is made

Question 3

How is NADP reduced in the light dependent reaction?

2

Answer 3

1) e- from chlorophyll
2) transferred to NADP

Question 4

How is CO2 converted to glucose in the light independent reaction?

6

Answer 4

1) CO” combines w/ RUBP via rubisco
2) makes 2GP
3) reduced to 2TP
4) using reduced NADP
5) using energy from ATP
6) TP converted into glucose

Question 5

Heat stress decreases the light dependent reaction. Why does this decrease the light independent reaction?

Answer 5

1) less ATP
2) so less NADP

Question 6

How does a decrease in the activity of rubisco limit the rate of photosynthesis?

2

Answer 6

1) less CO2 combined w/ RuBP
2) so less 2GP made