Roots show negative geotropism.
(a) Define geotropism. Give one example of geotropism.
(b) What is meant by 'positive geotropism' and 'negative geotropism'? Give one example of each type. Draw a lablled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.
(c) Name one plant part which exhibits positive thigmotropism.