EduNinja

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 the lungs

2.72B Urea formation

2.73B Urinary system structure

2.74B Nephron structure

2.75B Ultrafiltration

2.76B Selective reabsorption

2.77B ADH and urine concentration

2.79B Kidney transplants

(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)

IGCSE Biology 2.70 Metabolic waste gases Topic Practice

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