Photosynthesis

Question 1

Light Dependent reaction occurs in…?

Answer 1

The thylakoid membranes of chloroplast

Question 2

Photosystem = ??

Answer 2

A group of pigments on thylakoid membranes

Question 3

Photosystem I absorbs light at a wavelength of….?

Answer 3

700nm

Question 4

Photosystem II absorbs light at a wavelength of ….?

Answer 4

680nm

Question 5

The light Dependent reaction consists of…..

Answer 5

Non-cyclic photo phosphorylation 🍓🙅

Question 6

Light dependent reaction process??

Answer 6

• light is absorbed by chlorophyll in Photosystem II
• electrons have increased energy
• electrons pass down a series of electron carriers (transport chain)
• electron carriers are reduced
• the energy it looses is used to make ATP from ADP and Pi
• light is absorbed by chlorophyll in Photosystem I
• electrons have increased energy
• the energy is used to make NADPH

-photolysis (the splitting of water) gives electrons to Photosystem II and also makes oxygen

Question 7

Role of photolysis in the LDR?

Answer 7

Photolysis (the splitting of water) gives electrons to Photosystem II and also makes oxygen
🎀🎀🎀🎀

Question 8

What products of the LDR are used in the LIR??

Answer 8

ATP and NADPH

Question 9

How is ATP made in the LDR??

Answer 9

ATP is made using ATPsynthase enzyme, which is activated by a concentration gradient of H+ ions

Question 10

Where does the light Independent reaction occur??

Answer 10

In the stroma of the chloroplast

Question 11

The process of the light Independent reaction??

Answer 11

RuBP combines with CO2 (using rubisco)
2 GP produced
2 GP reduced to 2 TP

(ATP > ADP + Pi )
(NADPH > NADP + H )

Glucose made, other carbon containing molecules protein amino acids starch

2TP converted to RuBP
( using ATP)

Question 12

Limiting factor on photosynthesis??

Answer 12

If there is not enough of a factor that is needed for photosynthesis 🎈🎈🎈

Question 13

Temperature increase on rate of photosynthesis ??

Answer 13

As temp increases the rate of photosynthesis also increases as particles have more KINETIC energy
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If temperature is increased too much then the rate of photosynthesis will decrease as ENZYMES (e.g. Rubisco) are DENATURED

Question 14

Affect of increasing light intensity on rate of photosynthesis ??

Answer 14

Light intensity increases, the rate of photosynthesis increases
(Light intensity is the limiting factor while the graph is increasing)
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Then the rate plateaus and remains the same, even with increasing light.
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This is because something other than light is now the limiting the rate of reaction

Question 15

Affect of increasing carbon dioxide conc. on rate of photosynthesis ???

Answer 15

CO2 conc. increases the rate of photosynthesis increases…
Carbon dioxide is the limiting factor while the graph is increasing
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Then rate remains the same, even if you increase CO2 conc.
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Because something other than CO2 is now limiting the rate of reaction