What Changes May Occur in the Plants External Responses

Examples of plant tropisms include: ○ Phototropism – The way a plant grows or moves in response to light. ○ Gravitropism – The way a plant grows or moves in response to gravity; also called geotropism. ○ Hydrotropism – The way a plant grows or moves in response to water.

What changes may occur in the plant's external responses?

Growth Responses. A plant’s sensory response to external stimuli relies on chemical messengers (hormones). Plant hormones affect all aspects of plant life, from flowering to fruit setting and maturation, and from phototropism to leaf fall. Potentially every cell in a plant can produce plant hormones.

How do plants respond to changes in the environment?

Plants respond to their environment. They grow toward light. Plant leaves bud and seeds germinate when the temperature is right. Their roots and stems grow in certain directions in response to the pull of gravity.