Question

What are the internal stimuli for plant growth

Answer 1

Plant Responses to Internal Stimuli

All organisms have internal communication pathways to help them maintain homeostasis.
Plants need water and nutrients to grow. If water is lacking, the plant may wilt in response. If nutrients are missing from the plant’s environment, its growth might be stunted. These are examples of biological responses.
As with responses to external stimuli, plants rely on hormones to send signals within the plant in order to respond to internal stimuli. For example, some hormones signal a plant to expand its root system in response to lack of water or nutrients.