AQA A LEVEL BIOLOGY PAPER 2 COMPLETE GUIDE WITH 100%
RATED 40 QUESTIONS AND ANSWERS | GRADED A+ | 2025 LATEST
UPDATED | LATEST VERSIONS
In the following passage the numbered spaces can be filled with biological terms. During
photosynthesis, plants produce-(1)-compounds which contain carbon, such as carbohydrates,
lipids and proteins. Most of the sugars synthesised by plants are used by the plant in-(2)-. The
rest are used to make other groups of biological molecules. These biological molecules form the
biomass of the plants. Biomass can be measured in terms of mass of-(3)-per given area per given
time. The chemical energy store in dry biomass can be estimated using-(4)-.
Write the correct biological term beside each number below, that matches the space in the
passage - (ANSWER)1.Organic 2.Respiration 3.Carbon 4.Calorimetry
Describe light dependent reaction of photosynthesis. - (ANSWER)1. Carbon dioxide
combines/reacts with ribulose bisphosphate/RuBP2. Produces two glycerate (3- )phosphate/GP
using (enzyme) Rubisco
3. GP reduced to triose phosphate; 4. Using reduced NADP
5. Using energy from ATP
6. Triose phosphate converted to glucose
Put a tick ( ) in the box next to the equation that shows how the net production of consumers, N,
can be calculated where I represents the chemical energy store in ingested food F represents the
chemical energy lost to the environment in faeces and urine R represents the respiratory losses to
the environment. - (ANSWER)N = I - (F + R)
In December 2017, the female breeding herd was 48% of all female cattle in the UK. Use Table 1
to calculate the percentage of all female cattle that were beef cows in the UK in December 2017.
- (ANSWER)21.6
Use Table 1 to calculate the increase in the number of dairy cows in the UK female breeding
herd between December 2013 and December 2017. - (ANSWER)88500
, Farming cattle for humans to eat is less efficient than farming crops because of energy transfer.
Explain why. - (ANSWER)1. Energy lost between/at trophic/feeding levels
2. Energy lost via respiration/excretion/faeces;
Apart from temperature and pH, give two variables the scientist would have controlled when
preparing the liquid medium cultures. - (ANSWER)1. Volume of (stock) bacteria (culture)
2. Concentration of (stock) bacteria
A student concluded that this investigation showed that ammonia inhibits nitrogenase activity in
nitrogen-fixing bacteria. Use all the information to evaluate the student's conclusion. -
(ANSWER)1. Nitrogenase activity decreases with increase in ammonium chloride
(concentration)
2. Nitrogenase activity zero with high (concentration of) ammonium chloride
3. Only used one species
Nitrogenase catalyses the reduction of nitrogen during nitrogen fixation. The reaction requires 16
molecules of ATP for each molecule of nitrogen that is reduced. When ammonia inhibits
nitrogenase activity, nitrogen-fixing bacteria may benefit. Explain how. - (ANSWER)1. Less/no
ATP/energy required/used OR More ATP/energy available
2. ATP/energy can be used for growth/synthesis/replication
Put a tick ( ) in the box next to the process that occurs in anaerobic respiration but does not occur
in aerobic respiration. - (ANSWER)Reduction of pyruvate
During the 48 hours, the coloured liquid moved to the left. Explain why. - (ANSWER)1.
Oxygen/O2 taken up/used (by seeds) 2. Carbon dioxide/CO2 (given out) is absorbed by
solution/potassium hydroxide/KOH
3. Decrease in pressure/volume (of air inside);
RATED 40 QUESTIONS AND ANSWERS | GRADED A+ | 2025 LATEST
UPDATED | LATEST VERSIONS
In the following passage the numbered spaces can be filled with biological terms. During
photosynthesis, plants produce-(1)-compounds which contain carbon, such as carbohydrates,
lipids and proteins. Most of the sugars synthesised by plants are used by the plant in-(2)-. The
rest are used to make other groups of biological molecules. These biological molecules form the
biomass of the plants. Biomass can be measured in terms of mass of-(3)-per given area per given
time. The chemical energy store in dry biomass can be estimated using-(4)-.
Write the correct biological term beside each number below, that matches the space in the
passage - (ANSWER)1.Organic 2.Respiration 3.Carbon 4.Calorimetry
Describe light dependent reaction of photosynthesis. - (ANSWER)1. Carbon dioxide
combines/reacts with ribulose bisphosphate/RuBP2. Produces two glycerate (3- )phosphate/GP
using (enzyme) Rubisco
3. GP reduced to triose phosphate; 4. Using reduced NADP
5. Using energy from ATP
6. Triose phosphate converted to glucose
Put a tick ( ) in the box next to the equation that shows how the net production of consumers, N,
can be calculated where I represents the chemical energy store in ingested food F represents the
chemical energy lost to the environment in faeces and urine R represents the respiratory losses to
the environment. - (ANSWER)N = I - (F + R)
In December 2017, the female breeding herd was 48% of all female cattle in the UK. Use Table 1
to calculate the percentage of all female cattle that were beef cows in the UK in December 2017.
- (ANSWER)21.6
Use Table 1 to calculate the increase in the number of dairy cows in the UK female breeding
herd between December 2013 and December 2017. - (ANSWER)88500
, Farming cattle for humans to eat is less efficient than farming crops because of energy transfer.
Explain why. - (ANSWER)1. Energy lost between/at trophic/feeding levels
2. Energy lost via respiration/excretion/faeces;
Apart from temperature and pH, give two variables the scientist would have controlled when
preparing the liquid medium cultures. - (ANSWER)1. Volume of (stock) bacteria (culture)
2. Concentration of (stock) bacteria
A student concluded that this investigation showed that ammonia inhibits nitrogenase activity in
nitrogen-fixing bacteria. Use all the information to evaluate the student's conclusion. -
(ANSWER)1. Nitrogenase activity decreases with increase in ammonium chloride
(concentration)
2. Nitrogenase activity zero with high (concentration of) ammonium chloride
3. Only used one species
Nitrogenase catalyses the reduction of nitrogen during nitrogen fixation. The reaction requires 16
molecules of ATP for each molecule of nitrogen that is reduced. When ammonia inhibits
nitrogenase activity, nitrogen-fixing bacteria may benefit. Explain how. - (ANSWER)1. Less/no
ATP/energy required/used OR More ATP/energy available
2. ATP/energy can be used for growth/synthesis/replication
Put a tick ( ) in the box next to the process that occurs in anaerobic respiration but does not occur
in aerobic respiration. - (ANSWER)Reduction of pyruvate
During the 48 hours, the coloured liquid moved to the left. Explain why. - (ANSWER)1.
Oxygen/O2 taken up/used (by seeds) 2. Carbon dioxide/CO2 (given out) is absorbed by
solution/potassium hydroxide/KOH
3. Decrease in pressure/volume (of air inside);
