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2024 Pearson Edexcel A Level GCE In Biology A Salters Nuffield (9BN0) Paper 03: General and Practical Applications in Biology actual question paper and marking scheme merged 2024 £6.03   Add to cart

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2024 Pearson Edexcel A Level GCE In Biology A Salters Nuffield (9BN0) Paper 03: General and Practical Applications in Biology actual question paper and marking scheme merged 2024

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2024 Pearson Edexcel A Level GCE In Biology A Salters Nuffield (9BN0) Paper 03: General and Practical Applications in Biology actual question paper and marking scheme merged 2024

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[ Pearson Edexcel A Level GCEIn Biology A Salters Nuffield
(9BN0)Paper 03: General and Practical Applications in Biology ]
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Pearson Edexcel Level 3 GCE
Wednesday 19 June 2024
Morning (Time: 2 hours) Paper
reference 9BN0/03
� �
Biology A (Salters Nuffield)
Advanced
PAPER 3: General and Practical Applications in Biology

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DO NOT WRITE IN THIS AREA
1 One of the first plant species to colonise some habitats is thale cress
(Arabidopsis thaliana).
The plant hormone IAA (auxin) is produced in the growing tips of plants such asthale cress.




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(Source: Nigel Cattlin / Alamy Stock Photo)

(a) State what is meant by the term colonisation of a habitat.
(1)
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, (b) One role of IAA is to stimulate the phototropic response of shoots. Describe

how IAA causes a phototropic response in the shoots of a plant.
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(3)

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(c) Another role of IAA is to stimulate the growth of lateral roots.The

diagram shows the roots of thale cress.




lateral roots
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main root




3


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