Locomotion and Movement: Class 11 Biology NCERT Chapter 20

Key Features of NCERT Solutions for Class 11 Biology Chapter 20 – Locomotion and Movement

In chapter 19 of NCERT class 11 Biology: Excretory Products and their Elimination you studied about that excretion is the procedure by which every single living life form take out their body squander including plants.In this chapter: Locomotion and Movement you will get to know about locomotion and development, we regularly utilize one for the other. However, it is essential to comprehend the contrast between the two according to living things. 

 Development is something that separates a living thing from a non-living thing.

Quick Revision Notes

What is the difference between Movement and Locomotion?

Development can be at organism level, tissue level just as cell level. For Example: Cell moves starting with one spot then onto the next at the hour of undeveloped organism arrangement. Though Locomotion is named as development of a body starting with one pivot then onto the next (or many) regarding co-ordinates. 

It must be noticed that Movement of cell starting with one spot then onto the next can’t be considered as Locomotion. Development, on one hand, can be deliberate or automatic. While Locomotion is consistently willful in nature. 

What is Locomotor Movements?

Movements that happen over some separation is known as Locomotor Movements. For Example: strolling, running, and so on. Locomotion consistently happen at the organism level. Locomotion includes locomotory organs that help the body to move starting with one spot then onto the next. Locomotion is consistently intentional. 

Development is the point at which the living organism moves a body part or parts to bring without an adjustment in the situation of the organisms. Locomotion is the point at which the development of a piece of the body prompts change in the position and area of the organism. Both of these are realized by the joint endeavors of the skeletal and strong frameworks. Development is seen in the two vertebrates and spineless creatures. 

Peruse more Topics under Locomotion And Movement 

  • Muscle 
  • Skeletal System 
  • Joints 
  • Issues of Muscular and Skeletal System 

Kinds of Movements 

At the point when we talk about locomotion and development, there are three kinds of movements: 

Amoeboid development is realized by pseudopodia which are limbs which moves with development of cellular material inside a cell. 

Ciliary development is realized by limbs called as cilia which hair-like expansions of the epithelium. Hence, both these sorts of movements are seen with cells of the lymphatic framework. 

Solid development is a more unpredictable development which is achieved by the musculoskeletal framework. This kind of development is found in the higher vertebrates. To see more about the movements realized by the musculoskeletal framework, we have to comprehend the sorts of muscles, and joints.

Types of Muscles

Muscles found in higher vertebrates are of three types:

Striated or Skeletal Muscles

These muscles are intentional in nature which implies their development is heavily influenced by our will. They are primarily answerable for realizing the development of stance and area of the organism. Therefore, they are called striated muscles because of the nearness of striations present on them when seen under the magnifying instrument. 

Unstriated or Smooth Muscles

These muscles are automatic in nature which implies their development isn’t heavily influenced by our will. When seen under the magnifying lens, they don’t have any striations on them. Hence, these muscles are found in the stomach related plot and conceptive framework. 

Cardiac Muscles

These muscles are specific muscles that are discovered uniquely in the heart. They are automatic muscles that have striations on them. They have the property to contract and unwind in a cadenced way.

Skeletal System

The skeletal framework is comprised of bones and ligaments. There are a sum of 206 bones in the body. They are separated into the Axial skeleton and the attached skeleton. 

The hub skeleton comprises of bones that are found towards the focal point of the body including the skull, the vertebrae, and the sternum. The affixed skeleton comprises of bones that are found in the limits. 


They structure an indispensable segment of the train contraption. A joint is a name given to at least two bones that well-spoken with one another to realize a development. Contingent upon the kind of development they permit, joints can be of three sorts: Fixed, somewhat moveable and moveable joints. 

What is the Movement of Cilia?

Cilia is comprised of proteins known as microtubules that encourages them to move. Ciliary Movement is the musical, clearing development of epithelial cell cilia, of ciliate protozoans, or the sculling development of flagella, affected potentially by the substitute compression and unwinding of contractile strings (myoids) on one side of the cilium or flagellum. 


Q: What sort of muscles are found in the regenerative framework? 

  • Cardiovascular Muscles 
  • Striated Muscles 
  • Skeletal Muscles 
  • Smooth Muscles 

Sol: Henceforth, Correct answer is (d) Smooth muscles 

The conceptive framework has smooth or automatic muscles that are not heavily influenced by our will. 

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