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Phytohormones are:

1. chemicals regulating flowering
2. chemicals regulating secondary growth
3. hormones regulating growth from seed to adulthood
4. regulators synthesised by plants and influencing physiological processes

Correct answer: regulators synthesised by plants and influencing physiological processes

Solution

Phytohormones are plant hormones: substances synthesized by plants that act in very small amounts to regulate physiological activities. This definition is broader than just flowering, secondary growth, or a single life stage.

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