Control of Tropism by IAA 0.0 / 5 ? BiologyHuman, animal and plant behaviourA2/A-levelAQA Created by: MollyCreated on: 04-04-14 08:10 What is tropism? a growth movement of a plant in response to a directional stimulus. 1 of 9 Positive tropism is... Towards a stimulus. 2 of 9 Negative tropism is... Away from a stimulus. 3 of 9 Phototropism is? a growth response to light. 4 of 9 Geotropism is? A growth response to gravity. 5 of 9 The SHOOT of a plant is .......... geotropism and ........ phototropism negatively geotropic and positively phototropic. 6 of 9 What are advantages of a plant being phototropic? Traps more light for photosynthesis. 7 of 9 What are the advantages of a plant being geotropic? The shoot of a germinating seed grows out of the soil, and there are more chances for pollination or seed dispersal. 8 of 9 Advantages of a root growing towards gravity? To anchor the plant, To search for water, To ensure the root of a germinating seed always grows downwards whatever the position of the seed. 9 of 9
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