Plant responses, tropisms and plant growth regulators

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Describe how plants respond to internal and external stimuli and distinguish tropic responses from other plant responses.
Explain phototropism and gravitropism in shoots and roots, including stimulus perception, unequal distribution of auxin and differential cell elongation.
Interpret experimental evidence for tropisms, including the effects of removing or covering shoot tips and the role of diffusible growth substances.

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Evaluate practical applications of plant growth regulators in agriculture and horticulture, such as selective weedkillers, rooting powders, tissue culture uses, fruit set or ripening control.

Apply knowledge of plant responses to unfamiliar experimental setups, predicting outcomes and explaining controls, variables and observed growth patterns.

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