MOCK

Question 0

Planting marram grass is useful to sand dune ecosystems-how?

Answer 0

Marram grass stabilises sand

Improves soil - less hostile conditions

Question 1

Investigating distribution of marram grass from one side of the dune to the other:

Answer 1

Transects- tape measure along ground
Quadrats - placed along tape at each meter/interval + percentage cover counted
Or
Random throwing of Quadrat to avoid bias

Question 2

Where in the chloroplast does the light - dependent reaction occur?

Answer 2

Thylakoid

Question 3

Name substances A,B,C

Answer 3

A - o2
B - ADP + Pi
C - NADPH

Question 4

Explain role of chlorophyll in photolysis

Answer 4

Chlorophyll absorbs light energy = loosing electrons = oxidized
Accepts electrons from water
Water dissociates

Question 5

Explain how energy of light is converted into chemical energy

Answer 5

Light-> chloroplast -> thylakoids
Energy excited electrons + raises energy levels
Electrons move down electron transport chain - reducing carriers
Energy used to create ATP

Question 6

Explain why between 0-300s concentration of radioactive GP remained constant

Answer 6

GP formed from RUBP + CO2
GP reduced to TP
GP formed at the same rate is it used

Question 7

Explain why between 300s-380s the concentration of radioactive RUBP increased

Answer 7

No Co2 to combine with RUBP
no GP produced
no GP reduced to TP
RUBP reformed from TP

Question 8

Name factors that limited the rate of photosynthesis

Answer 8

Temperature + light

Question 9

Explain why temp + light limit photosynthesis

Answer 9

Increase light = increased photosynthesis = more reactions

Increased temp = increased photosynthesis = increased uptake of co2

Question 10

Describe + explain how changes are likely to affect creeping azalea

Answer 10

Growth decrease at high temp
Respiration increase at high temp
Cloud cover affects light intensity

Question 11

2 ways properties of ATP make it a suitable source of energy in biological processes

Answer 11

Energy released in small amounts

Involves a single reaction

Question 12

Explain why it is necessary for them to synthesise such as large amounts of ATP

Answer 12

ATP unstable
Cannot be stored
ATP only releases small amount of energy at a time p

Question 13

Mitochondria in muscle cells have more cristae than skin cells: explain advantage

Answer 13

Large SA to volume ratio - for electron transport chain - more ATP production
Muscle cells use more ATP

Question 14

Name substance X

Answer 14

Pyruvate

Question 15

Link reaction: pyruvate is converted to 2 carbon substance - what happens

Answer 15

Co2 formed
Hydrogen released
Reduced NAD formed
Acetyl COA produced

Question 16

Describe roles of coenzymes + carrier proteins in synthesis of ATP

Answer 16

NAD/FAD reduced - hydrogen attached to NAD/FAD
Hydrogen electrons transferred from carrier to carrier
Series of re-dox reactions
Energy used to synthesise ATP from ADP + Pi

Question 17

Suggest why herbivores lose more in faeces than carnivores

Answer 17

Cellulose present - cannot be digested - contains energy

Question 18

Explain why small mammals have a higher rate of respiration than larger animals

Answer 18

Large SA to volume
Lose more hear
Maintains body temperature