Write the Difference Between Tropism and Nastic Movement

By Esha Dhawan|Updated : September 7th, 2022

Nastic and tropism movements are both plant movements in response to external stimuli. On the one hand, tropism movement relies on the path of stimulus, whereas nastic movement does not rely on the path of stimulus. Let’s dive deeper to understand the difference between tropism and nastic movement.

Answer:

Difference Between Tropism and Nastic Movement

The difference between tropism and nastic movement has been explained in the table below.

Tropism movement

Nastic movement

Tropism is a response to stimuli that arrives from one direction 

Nastic gestures or movements are non-directional responses to stimuli, such as heat and temperature.

Tropism is a directional motion.

The biggest characteristic of the nastic movement is that the direction of the stimulus does not control movements.

Positive tropism denotes the plant component’s movement towards the stimulus. In contrast, if the plant portion’s movement is away from the stimulus, it is referred to as negative tropism.

Touch, light, temperature, and chemicals may induce nastic movement. Whatever the stimulus path, the gestures often happen in a specific path. 

Examples – Phototropism, Geotropism, etc.

Examples – Venus flytrap’s movement 


Summary:

Write the Difference Between Tropism and Nastic Movement

Although both tropism and nastic movement are the response to external stimuli, tropisms are directional and arrive in one direction, whereas, nastic movements are non-directional responses to stimuli.

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