IB Biology HL C3.1.19 Hl Phytohormones Questions

Explore how auxin and cytokinin act as plant signalling chemicals, changing growth, cell elongation and gene expression during seedling development in IB Biology HL C3.1.19.

Exam points

Identify auxin and cytokinin as phytohormones and relate their production or action to plant growth and seedling development.
Explain that auxin changes cell elongation or gene expression as a plant signalling response.

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Study C3.1.19 (HL)—Phytohormones conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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(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.

Figure for Question IB Biology HL C3.1.19 Hl Phytohormones Questions question 1 — IB Biology HL

State the name and site of production of two phytohormones that regulate the growth of seedlings.

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IB Biology HL C3.1.19 Hl Phytohormones Questions question 1