Exam (elaborations)

Biology: Edexcel Ial Unit 3 - Past Paper Qustions With Complete Solutions

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Biology: Edexcel

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Biology: Edexcel

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Uploaded on November 12, 2024
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Type Exam (elaborations)
Contains Questions & answers

biology edexcel ial unit 3 past paper
qustions with complete solutions

Institution Biology: Edexcel
Module Biology: Edexcel

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Biology: Edexcel Ial Unit 3 - Past Paper
Qustions With Complete Solutions

Variables that should be controlled in the beetroot practical and how this could be done. 1)

volume of water (in the boiling tube) ;

2) suitable method e.g. measuring cylinder/pipette / eq.

3) reference to rinsing;

4) until clear/fixed time for all.

5) similar {variety/density/eq} of beetroot.

6) method to ensure same variety e.g. same beetroot.

7) pre-treatment e.g. storage.

8) detail of above.

9) (use same) part of beetroot/eq.

10) detail e.g. cut from middle, peeling.

Plant material was crushed an shaken with ethanol (for antiseptic properties analysis).

, Biology: Edexcel Ial Unit 3 - Past Paper
Qustions With Complete Solutions
Suggest improvements that could be made to this method. 1) weigh fixed/known amount

of plant.

2) measured/known volume of ethanol/known concentration of ethanol.

3) shake/leave for known/stated time.

4) standardised crushing method.

5) separation/filtration/eq.

6) use same part of plant/same strain/variety of the plant.

Describe how you would prepare an agar plate that tested for antiseptic properties of plants.

Making use of:

. sterile petri dish.

. sterile nutrient agar.

. pure culture of a suitable bacterium in a bottle.

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Exam (elaborations)

Biology: Edexcel Ial Unit 3 - Past Paper Qustions With Complete Solutions

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