Thekey differencebetween positive and negative tropism is that积极的向量主义是生物体或生物体的一部分向刺激的运动,而负面的朝向主义是生物体或生物体的运动或生长,或者是生物的一部分远离刺激。
Living organisms respond to differentstimuliin different ways. Plants respond in a different way than animals. Similarly, unicellular organisms react to stimuli differently. Tropism is the term used to describe these movements of organisms or parts of the organism towards or away from different stimuli. If an organism responds towards the direction of the stimulus, we call it positive tropism. In contrast, if an organism moves away from the stimulus, we call it negative tropism. If the stimulus is重力,根部表现出阳性的地球运动(朝向重力),而芽则显示出负面的地球运动(远离重力)。
内容
1.Overview and Key Difference
2.What is Positive Tropism
3.What is Negative Tropism
4.正面和负面主义之间的相似之处
5.Side by Side Comparison – Positive vs Negative Tropism in Tabular Form
6。概括
什么是积极的向向主义?
Positive tropism is the movement or growth shown by organisms towards the direction of the stimulus. Therefore, organisms grow or move in the direction of the stimulus. For example, plant shoots grow upwards looking for sunlight. This is positive phototropism. Moreover, plant roots grow downwards in the soil according to gravity. This is also a positive geotropism.
Some single-celled organisms show positive chemotropism. They move towards certain chemical substances. Some organisms show positive thermotropism. They move towards specific temperatures. Twining plants and tendrils showthigmotropism. When they touch a hard surface, they grow or move towards the stimulus.
什么是负面的对潮流?
Negative tropism is the movement or growth of an organism away from the stimulus. Therefore, organisms move or grow away in the direction of which the stimulus originates. Plant shoots grow away from the gravity. Hence, shoots show negative geotropism. Beetles show negative phototropism. They seek darkness for their safety. The growth of roots underneath the soil is a negative thigmotropism. When a growing root is in contact with an object such as rock, it grows away from it, showing negative thigmotropism. Some varieties of fish show negative chemotropism. They move away from chemicals which are hazardous to them.
What are the Similarities Between Positive and Negative Tropism?
- Positive and negative tropism are two types of responses shown by organisms based on the direction of the stimulus.
- They can be a movement or growth.
正面和负面主义有什么区别?
Positive tropism is the movement or growth of the whole organism or a part of the organism towards a stimulus while negative tropism is the movement or growth of the whole organism or a part of the organism away from a stimulus. So, this is the key difference between positive and negative tropism. Moreover, the plant shoots show positive phototropism while the plant roots show negative phototropism. But, the plant roots show positive geotropism, while the plant shoots show negative geotropism. Thus, this is another difference between positive and negative tropism.
Below is a summary tabulation of the difference between positive and negative tropism.
概括– Positive vs Negative Tropism
基于对刺激方向的反应,向流主义可能是阳性的向流或负面主义。积极的向向主义是向刺激方向的运动或生长。相比之下,负面的朝向主义是沿刺激方向的运动或生长。因此,这是正面和负面主义之间的关键区别。
Reference:
1. “Tropism.” Wikipedia, Wikimedia Foundation, 20 June 2020,Available here.
2. “Tropism.” Biology Dictionary, 29 Apr. 2017,Available here.
Image Courtesy:
1. “Phototrophic Response to Stimulus” By Mtomanelli15 – Own work (CC BY-SA 4.0) viaCommons Wikimedia
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