Define chemotropism. Give one example of chemotropism. State whether this example is of positive chemotropism or negative chemotropism.
(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.