Even More Past Papers

Question 1

If iron deficiency reduces electron transport. Explain why iron deficient plants have decrease in TP production

Answer 1

Less ATP produced
Less reduced NADP produced
ATP & reduced NADP produced in light dependent reaction
Less GP to TP

Question 2

Explain why iron deficiency results in a decrease in the uptake of co2

Answer 2

Less TP converted to RUBP

Co2 combines with RUBP

Question 3

Explain what is meant by the term phenotype

Answer 3

Characteristics expressed due to environment

Question 4

Explain why both experiments were carried out at the same temperature

Answer 4

Affects enzymes

Affects respiration

Question 5

Name the process where nitrate ions are converted to nitrogen

Answer 5

Denitrification

Question 6

Give 2 advantages of using natural fertiliser instead of artificial

Answer 6

Less leaching as slower release of nutrient

Contains wider range of elements

Question 7

State a null hypothesis

Answer 7

No correlation between….

Question 8

What biological molecules contain nitrogen

Answer 8

Amino acids
ATP
NAD

Question 9

What biological molecules contain phosphorus

Answer 9

ATP
RUBP
GP

Question 10

Describe the role of microorganisms in producing nitrates from the remains of dead organisms

Answer 10

Saprabiotic microorganisms
Break dead materials into ammonia

Ammonia to nitrate by nitrification

Question 11

Explain why Co2 uptake is a measure of net productivity

Answer 11

More co2 used in photosynthesis than respiration

Question 12

Investigation of anaerobic respiration of yeast.

Why was a layer of oil used

Answer 12

Prevent oxygen being absorbed