What is meant by 'positive geotropism' and 'negative geotropism? Give one example of each type. Draw a labeled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.
Positive geotropism is movement of a plant part towards the direction of gravity. For example, roots grow in the soil.
Negative geotropism is the movement of a plant part against the direction of gravity. For example, Stem or shoot grow outside the soil.