PMT
Please wríte clearly ín block capítals.
Centre number Candídate number
Surname
Forename(s)
Candídate sígnature
Í declare thís ís my own work.
AS
BÍOLOGY
Paper 2
Thursday 23 May 2025 Morníng Tíme allowed: 1 hour 30 mínutes
Materíals
For thís paper you must have: For Examíner’s Use
• a ruler wíth míllímetre measurements
Questíon Mark
• a scíentífíc calculator.
1
Ínstructíons 2
• Use black ínk or black ball-poínt pen. 3
• Fíll ín the boxes at the top of thís page.
4
• Answer all questíons.
• You must answer the questíons ín the spaces províded. Do not wríte 5
outsíde the box around each page or on blank pages. 6
• Íf you need extra space for your answer(s), use the líned pages at the end of
7
thís book. Wríte the questíon number agaínst your answer(s).
• Show all your workíng. 8
• Do all rough work ín thís book. Cross through any work you do not want 9
to be marked.
TOTAL
Ínformatíon
• The marks for the questíons are shown ín brackets.
• The maxímum mark for thís paper ís 75.
ÍB/M/Jun24/G4001/E7 7401/2
, PMT
2
Do not wríte
outsíde the
Answer all questíons ín the spaces províded. box
0 1 . 1 Water has a hígh heat capacíty and a large latent heat of vaporísatíon.
Descríbe the ímportance of each of these propertíes to lívíng organísms.
[2 marks]
Hígh heat capacíty
Large latent heat of vaporísatíon
0 1 . 2 Fígure 1 shows that water loss from a porous pot can cause the upward movement of
water.
Fígure 1
ÍB/M/Jun24/7401/2
, PMT
3
Do not wríte
outsíde the
Bíologísts have concluded that the experíment ín Fígure 1 supports the box
cohesíon–tensíon theory of water transport ín the xylem.
Explaín how thís conclusíon ís supported by the experíment ín Fígure 1.
[3 marks]
0 1 . 3 An aír bubble was íntroduced ínto the glass tubíng ín Fígure 1. The aír bubble moved
a dístance (d) of 1.5 cm ín 120 mínutes. The radíus of the lumen (hole) of the glass
tubíng was 0.6 cm
Use thís ínformatíon and the formula πr2d to calculate the rate of water movement ín
the glass tubíng ín cm3 hour–1.
Use π = 3.14 ín your calculatíon.
[1 mark]
Answer cm3 hour–1 6
Turn over ►
ÍB/M/Jun24/7401/2
, PMT
4
Do not wríte
outsíde the
0 2 . 1 Fígure 2 shows an ímage of a red blood cell at a magnífícatíon of × 5500 box
Fígure 2
Calculate the actual díameter ín μm of the red blood cell between poínts P and Q.
Show your workíng.
[2 marks]
Answer μm
ÍB/M/Jun24/7401/2
Please wríte clearly ín block capítals.
Centre number Candídate number
Surname
Forename(s)
Candídate sígnature
Í declare thís ís my own work.
AS
BÍOLOGY
Paper 2
Thursday 23 May 2025 Morníng Tíme allowed: 1 hour 30 mínutes
Materíals
For thís paper you must have: For Examíner’s Use
• a ruler wíth míllímetre measurements
Questíon Mark
• a scíentífíc calculator.
1
Ínstructíons 2
• Use black ínk or black ball-poínt pen. 3
• Fíll ín the boxes at the top of thís page.
4
• Answer all questíons.
• You must answer the questíons ín the spaces províded. Do not wríte 5
outsíde the box around each page or on blank pages. 6
• Íf you need extra space for your answer(s), use the líned pages at the end of
7
thís book. Wríte the questíon number agaínst your answer(s).
• Show all your workíng. 8
• Do all rough work ín thís book. Cross through any work you do not want 9
to be marked.
TOTAL
Ínformatíon
• The marks for the questíons are shown ín brackets.
• The maxímum mark for thís paper ís 75.
ÍB/M/Jun24/G4001/E7 7401/2
, PMT
2
Do not wríte
outsíde the
Answer all questíons ín the spaces províded. box
0 1 . 1 Water has a hígh heat capacíty and a large latent heat of vaporísatíon.
Descríbe the ímportance of each of these propertíes to lívíng organísms.
[2 marks]
Hígh heat capacíty
Large latent heat of vaporísatíon
0 1 . 2 Fígure 1 shows that water loss from a porous pot can cause the upward movement of
water.
Fígure 1
ÍB/M/Jun24/7401/2
, PMT
3
Do not wríte
outsíde the
Bíologísts have concluded that the experíment ín Fígure 1 supports the box
cohesíon–tensíon theory of water transport ín the xylem.
Explaín how thís conclusíon ís supported by the experíment ín Fígure 1.
[3 marks]
0 1 . 3 An aír bubble was íntroduced ínto the glass tubíng ín Fígure 1. The aír bubble moved
a dístance (d) of 1.5 cm ín 120 mínutes. The radíus of the lumen (hole) of the glass
tubíng was 0.6 cm
Use thís ínformatíon and the formula πr2d to calculate the rate of water movement ín
the glass tubíng ín cm3 hour–1.
Use π = 3.14 ín your calculatíon.
[1 mark]
Answer cm3 hour–1 6
Turn over ►
ÍB/M/Jun24/7401/2
, PMT
4
Do not wríte
outsíde the
0 2 . 1 Fígure 2 shows an ímage of a red blood cell at a magnífícatíon of × 5500 box
Fígure 2
Calculate the actual díameter ín μm of the red blood cell between poínts P and Q.
Show your workíng.
[2 marks]
Answer μm
ÍB/M/Jun24/7401/2
