IGCSE Biology

Explain how using antibiotics only when essential can limit the development of resistant bacteria such as MRSA

State that some bacteria are resistant to antibiotics which reduces the effectiveness of antibiotics

Describe the use of antibiotics for the treatment of bacterial infections

Explain the role of auxin in controlling shoot growth, limited to: (a) auxin is made in the shoot tip (b) auxin diffuses through the plant from the shoot tip (c) auxin is unequally distributed in response to light and gravity (d) auxin stimulates cell elongation

Explain phototropism and gravitropism of a shoot as examples of the chemical control of plant growth

Investigate and describe gravitropism and phototropism in shoots and roots

Describe phototropism as a response in which parts of a plant grow towards or away from the direction of the light source

Describe the maintenance of a constant internal body temperature in mammals in terms of: insulation, sweating, shivering and the role of the brain 8 Describe the maintenance of a constant internal body temperature in mammals in terms of vasodilation and vasoconstriction of arterioles supplying skin surface capillaries

Outline the treatment of Type 1 diabetes 6 Identify in diagrams and images of the skin: hairs, hair erector muscles, sweat glands, receptors, sensory neurones, blood vessels and fatty tissue

Describe the control of blood glucose concentration by the liver and the roles of insulin and glucagon