Climate Change (14)

Question 1

Impact of CC on photosynthesis/Rubisco?

Answer 1

● In C3 plants
= Rubisco works when light exists.

● In C4 plants
= Rubisco works overtime.

Question 2

Why does Rubisco work overtime in C4 plants?

Answer 2

To compensate for the inability of PEP to fixate CO2 effectively.

Question 3

C3 plants/RUBP features of efficiency? (3)

Answer 3

• High [CO2].
• Low temperatures.
• High H2O supply.

Question 4

C4 plants/PEP features of efficiency? (3))

Answer 4

• Low [CO2].
• High temperatures.
• Low H2O supply.

Question 5

Which plants are going to be a bit more efficient & invade into the different biomes?

Answer 5

Argue for C3 plants BUT this is true for their response to CO2 not for their response to temperature.

Question 6

Forests pathway?

Answer 6

= C3.

Question 7

Grasslands pathway?

Answer 7

= C4.

Question 8

Savannas pathway?

Answer 8

C3 and C4.

Question 9

Fynbos & Succulent Karoo pathway?

Answer 9

= CAM.

Question 10

If you consider that CC is only about CO2, which is the dominant photosynthetic pathway?

Answer 10

RUBP.

Question 11

If you consider that CC is only about CO2 & Temperature, which is the dominant photosynthetic pathway?

Answer 11

PEP.

Question 12

What do these changes mean for plantbiomes in SA?

Answer 12

• Imagine this in diagram form with various arrow sizes.

Question 13

CC & WUE?

Answer 13

Stomata of C3 & C4 plants may respond differently to high [CO2] & may change depending on whether the guard cells change with high CO2.

Question 14

2 Important things to note for exam approach?

Answer 14

● In-depth = Knowledge you’ve acquired.

● Breadth = Application.