Question

Describe how you could use plants like this to investigate the effect of the concentration of a
rooting hormone in the water in the bottle on the growth of roots. Include details of the
number of plants, the control of variables and how you will measure the growth of the roots.

Answer 1

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Auxins are a family of plant hormones. They are mostly made in the tips of the growing stems and roots, which are known as apical meristems, and can diffuse to other parts of the stems or roots. Auxins control the growth of plants by promoting cell division and causing elongation in plant cells (the cells get longer).