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Pearson Edexcel International GCSE Biology (4BI1)

1 The nature and variety of living organisms

(a) Characteristics of living organisms

(b) Variety of living organisms

2 Structure and functions in living organisms

(a) Level of organisation

(b) Cell structure

(c) Biological molecules

(d) Movement of substances into and out of cells

(f) Respiration

(g) Gas exchange

2.70 Metabolic waste gases

2.71 Excretory products of lungs, kidneys and skin

2.72B Kidney excretion and osmoregulation

2.73B Urinary system structure

2.74B Nephron structure

2.75B Ultrafiltration

2.76B Water reabsorption from the collecting duct

2.77B Selective reabsorption of glucose

2.78B ADH and blood water content

2.79B Urine composition

(j) Co-ordination and response

3 Reproduction and inheritance

(a) Reproduction

(b) Inheritance

4 Ecology and the environment

(a) The organism in the environment

(b) Feeding relationships

(c) Cycles within ecosystems

(d) Human influences on the environment

5 Use of biological resources

(a) Food production

(b) Selective breeding

(c) Genetic modification (genetic engineering)

6 Experimental skills

(a) Problem-solving and application

(b) Investigation planning and methods

(c) Observations, measurements and variables

(d) Analysis, communication and evaluation

7 Mathematical skills

1 Arithmetic and numerical computation

2 Handling data

5 Geometry and trigonometry

Question Bank/IGCSE Edexcel Biology/2 Structure and functions in living organisms/(i) Excretion/2.72B Kidney excretion and osmoregulation

Edexcel IGCSE Biology 2.72B Urea formation

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