Chapter 39

Plant Responses to Internal and External Signals

Understand how plants respond to their environment. Master plant hormones and responses - high-yield for all exams.

8 Hours

Olympiad 5/5

Advanced

NEETRequired

MCATOptional

AP BiologyRequired

IB BiologyRequired

USABO

5/5

BBO

5/5

INBO

5/5

IBO

5/5

Key Topics Covered

Plant hormones - auxin, gibberellins, cytokinins

Tropisms and movements

Photoperiodism and flowering

Plant defense responses

Stress responses

Describe major plant hormone functions

Explain tropism mechanisms

Understand photoperiodism and flowering

Describe plant defense mechanisms

Extremely important! Plant Growth and Development chapter tests all hormones, their discovery, and functions.

Olympiads test hormone signaling pathways, photoreceptors, circadian rhythms, and experimental design.

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