Explain the role of auxin in controlling shoot growth, limited to: (a) auxin is made in the shoot tip (b) auxin spreads through the plant from the shoot tip (c) auxin is unequally distributed in response to light and gravity (d) auxin stimulates cell elongation
1 Answer
Describe phototropism as a response in which parts of a plant grow towards or away from light
1 Answer
Describe gravitropism as a response in which parts of a plant grow towards or away from gravity
1 Answer
Describe the signs of Type 1 diabetes (limited to increased blood glucose concentration and glucose in urine) and its treatment (administration of insulin)
1 Answer
Describe the control of blood glucose concentration by the liver and pancreas and the roles of insulin and glucagon
1 Answer
Explain the need to control blood glucose concentration
1 Answer
Explain how each of the following processes contributes to the maintenance of constant internal body temperature in mammals: (a) sweating (b) shivering (c) contraction of hair erector muscles (d) vasodilation and vasoconstriction of arterioles supplying skin surface capillaries
1 Answer
Describe the roles of the hypothalamus and of temperature receptors in the skin in maintaining a constant internal body temperature in mammals
1 Answer
Describe the role of insulation in maintaining a constant internal body temperature in mammals
1 Answer
Describe homeostasis as the maintenance of a constant internal environment
1 Answer
BNO Team