Phytohormones are plant signalling chemicals that control growth and development. Review auxin, cytokinin and ethylene as plant signals in IB Biology HL C3.1.19.
(a) Explain how the pressure potential and solute potential change inside a plant root cell when it is placed into a solution that is more hypotonic than the cell's cytoplasm.
The photograph shows a seedling (young plant) of the family Fabaceae. The shoot and roots have been labelled.
State the name and site of production of two phytohormones that regulate the growth of seedlings.