Biology Paper 2 Exam Qs

2025: Suggest how a fossil forms

• organism dies and is buried in sediment

• soft parts decayed or bones did no decay

• bones were replaced by minerals or mineralisation of bones

2025: Define geotropism (2)

growth (response)

due to gravity

2025: Plan an investigation to find the effect of the direction of light on the growth of plant seedlings.

You may use the equipment shown in Figure 3 and any other laboratory equipment

2025: Explain how a plant’s response to light (phototropism) helps the plant survive (3)

• plant absorbs more light

• so more photosynthesis

• which produces more glucose

2025: hGH is a protein.

A child with a deficiency of hGH can be given injections of hGH.

What would happen to the hGH if it was given as a tablet that was swallowed? (1)

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2025

2025: Define biodiversity (1)

the variety of all SPECIES on Earth

2025: Explain how the destruction of peat bogs can affect biodiversity:(6)

• in the local area

• globally

2025: Which cell division is mitosis? (1)

1

2025: Explain why the offspring produced using runners are genetically identical (2)

• only mitosis

• so all cells receive a copy of every allele/gene/DNA/chromosome

2025: Explain why the offspring produced using flowers, fruits and seeds are not genetically identical (2)

2025: Describe two advantages of asexual reproduction of strawberry plants (2)

2025: Describe two advantages of sexual reproduction for the survival of strawberry plants (2)

2025

2025: Catching a ruler in the ruler drop test is a response to a stimulus

Describe how a student’s response was coordinated by the nervous system (6)

2025: White rabbits have one base change in the gene that codes for the enzyme tyrosinase.

Explain how a change of one base in the DNA of the gene coding for tyrosinase could stop the tyrosinase working (4)

2024: What is a mutation (1)

any one from:

a change in:

• DNA

• base code or nucleotide sequence

• base

• gene/allele

• part of a chromosome

• number of chromosomes

• genetic code/ material

2024: Describe the process of natural selection (3)

any three from:

• variation between members of a species

• better adapted survive

• and reproduce

• passing on favourable allele/ gene/ mutation

2024: Explain why most of the dead remains of plants in layer B do not decay (3)

2024: Explain how the destruction of peat bogs and the use of peat affects the temperature of the Earth’s atmosphere (4)

• increase in temperature or global warming

• because carbon dioxide is released

• carbon dioxide produced by the burning/decay of peat

• because methane is released (from the peat bog)

2024

2024: Auxin is a plant hormone.

Explain how auxin causes the results in apparatus A (2)

• uneven distribution of auxin

• so upper side grows faster/ more

Uses of auxin

• weed killers

• rooting powders

• promoting growth in tissue culture

Why are plants sprayed with gibberellin?

• promote / start flowering

• more fruit

• bigger fruits

2024: Describe two effects of adrenaline on the human body (2)

any two from:

• increases heart rate

• increases breathing rate

• increases oxygen delivery to cells/ tissues/ organs

• increases respiration/ metabolism

• increases sweating

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2024: Chickens can use 80% of the biomass from the maize seeds they eat for respiration and growth.

What happens to the remaining 20% of the biomass in the maize seeds? (1)

• lost via egestion / faeces

2024: Explain what is meant by the term ‘homeostasis’ (2)

2024: Describe what happens to glucose, protein and urea in the kidneys. (4)

• glucose and urea are filtered (out of blood)

• protein is not filtered (out of blood)

• all glucose reabsorbed

• urea (mostly) not reabsorbed or passes out in urine

2024: Explain how ADH affects the production and concentration of urine by the kidneys (4)

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