EXAM Q's

Question 0

Why efficiency of energy transfer is different at stages

Answer 0

• Light doesn’t fall into molecule
• not appropriate wavelength
• 2% efficiency of photosynthesis
• lost in respiration/faeces/heat/not eaten
• efficiency low in herbivores
• carnivores use more food

Question 1

Light energy generates ATP how?

Dependent

Answer 1

• Light absolved by leaf->thylakoid
• Light excites electrons
• Energy level raised
• Electrons pass down electron transfer chain in grana
• decrease in energy
• reduce carriers
• energy used to make ATP from ADP + Pi

Question 2

How intensive farming increases net productivity

Answer 2

Killed whilst young - more biomass
Controlled diet - less lost in faeces
Movement restricted - less resp. loss
Heated conditions - less energy lost
Genetically selected = productivity high

Question 3

Role of mitochondria in ATP production

Answer 3

• Electrons move down electron transport chain
• energy to protons into spaces between membrane
• protons move back to membrane into matrix by ATPase
• energy used to make ADP+P = ATP

Question 4

Carbon in co2 becomes carbon in TP:

Independent

Answer 4

Co2 combines w/RuBP
Produces 2 x 3 molecules of GP
reduced to TP
Using ATP
requires reduced NADP

Question 5

Adv. of biological agents

Answer 5

Specific 
One application
No resistance
No harm to environment
Organic

Question 6

Disadvantage of biological agent

Answer 6

Resistance
Expensive
Slow response

Question 7

Photosynthesis- co2->organic substance

Answer 7

Co2 w/ RuBP
=GP
reduced -> TP
Using ATP and reduced NADP
TP converted to organic substance