Difference Between Sessile and Motile

Key Difference – Sessile vs Motile

Thekey differencebetween sessile and motile is that theSessile organisms are not capable of moving from one place to anotherwhileMotile organisms are capable of moving from one place to another。无梗和动力are two different terms that describe certain morphological features of organisms living on earth. All living organisms can be grouped into these two categories based on their motility. This type of grouping is very primitive and categorizing organisms into these two groups is somewhat problematic. For example, some sessile organisms have immature stages that are motile and vise-versa. Therefore, this criterion is not considered when classifying the organisms into different taxonomical stages. However, this demarcation of organisms is important as a first approximation. In this article, the differences between sessile and motile will be further discussed.

What is Sessile?

无柄是用来解释无法从一个地方移到另一个地方的生物的术语。Plants are considered as sessile organisms。通常，无梗生物respond to theenvironmentalchanges mainly by changing their forms。例如，这棵树是一个无柄生物，可以通过将其叶子暴露在阳光下来回应光。此外，植物的生长朝向光，叶子以正确的角度定向以接收最大的光量。因此，环境因素；光可以通过改变树木的生长来改变树的形式。

Most of the earliest organisms are sessile and have simple techniques to obtain nutrients. Sessile organisms have to develop effective methods to protect themselves frompredators。为此目的，大多数无柄生物在碳酸钙等各种化学物质的帮助下都产生了结构变化（在corals), silica, lignin (in plants), etc

What is Motile?

Motile是用来解释可以从一个地方转移到另一个地方的生物的术语。大多数生物包括animals, humans, etc., are motile。However, some sessile animals like corals,海绵，一些蠕虫等motile larval stages。Unlike the sessile organisms, motile organismsrespond to environmental changes by changing their behavior。A good example is the migration of animals like fishes,wildebeests,zebras, etc., due to the unfavorable climatic conditions. Most motile animals haveactive feeding methods。

What is the Difference Sessile and Motile?

Definition of Sessile and Motile

Sessile Organisms:Sessile organisms无法移动, and they live in one place.

Motile Organisms:Motile organisms可以移动from one place to another place.

Characteristics of无梗和动力

Way of responding to environmental changes

Sessile Organisms:Sessile organisms respond bychanging their body form。

Motile Organisms:Motile species respond bychanging the behavior。

Feeding Methods

Sessile Organisms:Many sessile organisms showpassive feeding methods.

Motile Organisms:许多流动生物显示active feeding methods。

Nutrient Requirement

Motile Organisms:Most of the motile organisms have a greater number of ways to obtain food, but at the same time their nutrient requirement is high when compared to sessile organisms.

Sessile Organisms:Sessile organisms have few ways to obtain food that includesphotosynthesis

无柄和能动的有机体的例子

Sessile Organisms:Examples for Sessile organisms are plants, corals, barnacles etc.

Motile organisms:Examples for Motile organisms are Humans, animals, etc.

Image Courtesy:

“Meandrina meandrites (Maze Coral)” by Nhobgood Nick Hobgood – Own work.(CC BY-SA 3.0)viaWikimedia Commons

“Connochaetes taurinus -Wildebeest crossing river -East Africa” by Eric Inafuku – originally posted to Flickr as Wildebeest Crossing

（CC由2.0）viaWikimedia Commons