Skip to main content

THE MAGIC OF NATURE POEM WRITTEN BY SAFALYA PAL

THE MAGIC OF NATURE THE MAGIC OF NATURE OUR WONDER DOES GROW THE SECRETS OF NATURE ARE NOT FOR THE HUMANS TO KNOW THE MAGIC OF NATURE IS FOR ALL TO SEE IT IS ALL AROUND YOU AND ALL AROUND ME THE BEUTIFUL SCENIC VIEW EVERYTHING SEEMS AWESOME AND NEW LOOKING AT THE AWESOME SIGHT YOU FEEL SO TRANQUIL AND DELIGHT THINK HOW THE LUSH FORESTS ALWAYS REMAIN GREEN THINK WHY THE WATER DOESN’T ACCOMPLISH THINK HOW THE NORTHERN LIGHTS ESTABLISH THINK FROM WHERE DO WE GET NATURAL THINGS WE GET ALL THESE FROM THE NATURE AND THOSE ARE POSSIBLE FOR NATURE’S MAGIC! THE NATURAL BEAUTY OF NATURE HAS SO MUCH TO SAY, THE BEAUTIFUL CROSSROADS AND LONG WAY, THE NATURE HAS ITS CHARM, KEEP IT SAFE AND DO NOT HARM, THE NATURE WILL KEEP US UNSAFE, IF WE DON'T KEEP IT SAFE!                                          ...
Post a Comment

Body Movements, NCERT NOTES, Class 6

 

Body Movements

Introduction to Body Movements

Movements

The ability of organisms to change position, by using their body parts, is called movement.

Skeletal System

Skeleton

  • Skeleton is the internal structure in organisms which helps in bringing about movement.
  • It forms a framework that gives the shape of the body and provides support to organisms. 
  • The skeleton is made up of bones.
  • Different kinds of bones are joined to each other in a particular manner.
  • These joints facilitate various types of movements. 
  • In higher animals, bones, muscles and cartilage together make the movement possible.

Muscles

  • Muscles are parts of the body which help in bringing about movement.
  • Muscles may be attached to bones, (humans) or may work alone (earthworm).

Cartilage

  • Part of the skeleton that is not hard as bones and can be bent, is cartilage.
  • They are found in the upper part of the ear, the tip of the nose and at the tips of long bones. 

Joints

  • Joints are the points where two parts of the skeleton are fitted together and make movement possible.
  • Examples are hip joint, elbow joint, knee joint, etc

Ball and Socket Joint

  • Ball and socket joint, where the rounded end of one bone fits into the cavity of the other bone.
  • It brings in movement in all directions.
  • It is seen in the hips and shoulders of the human body.

Pivot Joint

  • A pivotal joint is where a cylindrical bone rotates in a ring.
  • It joins the neck to the head.
  • It allows to bend the head forward and backwards and turn the head to our left or right.

Hinge Joints

  • Hinge joints bring about movement in only back and forth direction.
  • The knees and elbows have hinge joints.
  • The following image is a hinge joint in the elbow.

Fixed Joints

  • Fixed joints are immovable joints because the bones are joined together.
  • Such joints are found in the skull.

    Gaits of Animals

    The different patterns of movement of animals due to the differences in their skeletal structure are called gaits of animals.

    Earthworm

    • The earthworm does not have any internal skeleton.
    • The body is made up of many rings joined end to end and muscles attached to these rings help to extend and shorten the body.
    • The skin of earthworm also has a large number of tiny bristles that help it get a good grip on the ground.
    • Repeated extension and contraction of the body muscles, enable the earthworm to move through the soil.

    Snail

    • Snails move with the help of their muscular, flat foot.
    • They glide along a solid surface which is lubricated with mucus. 
    • This motion is powered by succeeding waves of muscular contractions of the foot.

    Cockroach

    • The body of a cockroach is covered with a hard outer skeleton that is made of different units joined together.
    • It has three pairs of legs for walking and two pairs of wings attached to the breast for flying.
    • It has distinct muscles that are used for movement.
    • The muscles attached to the legs help in walking.
    • The breast muscles attached to the wings help in flying, although they are not good flyers.

    Birds

    • Birds have a special skeletal and muscular structures that help them to fly. 
    • The forelimbs are modified to become wings and the bones inside are hollow to suit flying.
    • The bones of the hind limbs are used for perching and walking. 
    • The shoulder bones and breastbones are strong and support muscles of flight which move the wings up and down.

    Fish

    • Fishes have a streamlined body that helps them swim with least resistance.
    • They use tail fin for small jerks through water and other fins assist swimming.
    • The tail fin is also used for changing directions.

    Snakes

    • Snakes do not have legs for movement but use their long backbone along with muscles for movement.
    • Their body curves into many loops which gives it a forward push by pressing against the ground.
    A sand snake moving forward
    Labels:

    Comments

    Post a Comment

    Popular posts from this blog

    ALL ABOUT PINHOLE CAMERA, NCERT NOTES, CLASS 6

      PINHOLE CAMERA The pinhole camera is based on the principle that light travels in a straight line. Construction of a Pinhole Camera- To construct a pinhole camera follow the steps described below - Take a small box like a shoebox. Paint the box entirely in black to light-proof it Appropriately determine the distance between the film of plastic or ground glass and light source and make a circular pinhole on the bottom of the box Make a shutter by cutting a piece of thick black chart paper. Use sturdy duct tape to hold the shutter in place Use a light adhesive to control the shutter flap and light entering the box Make a viewfinder out of cardboard. Pinhole Camera Image Characteristics- A real image is obtained as the image is obtained on the screen. The size of the image obtained is comparatively smaller than the actual object. The image is inverted on the x-axis as well as on the y-axis. The image can be used in the analysis of the rectilinear propagation of the light. Uses of...
    Post a Comment
    Read more

    How do vaccines work?

      How do vaccines work? The immune system These viruses go on to infect other cells. This causes havoc and this is where our immune system comes to our rescue. The immune system has a whole army of microscopic assassins that prevent these viruses from turning our body into a virus manufacturing unit factory. Now the immune system responds in two ways to protect us. One is the innate or non-specific immunity and another is the adaptive or specific immunity. Innate Immunity As the name suggests, this kind of immunity is there from birth and is non-specific which means that it responds to all kinds of pathogens in the same way. Its ultimate job is to kill the pathogen. The need here is to actually get into action very very quickly. In fact, as soon as the pathogens are detected. We can think about this type of immunity as more bran and less brain. The cells of the innate immunity go berserk as soon as they know that there are pathogens around. They are like the mad assassins trying to...
    Post a Comment
    Read more

    What is mucilage, how does it emerge?

      What is mucilage, how does it emerge ? Mucilage or "sea snot" is the result of the overgrowth of microscopic algae called "Phytoplankton", which constitutes the first step of biological production in the sea. The thick, mucus-like slimy layer contains a variety of microorganisms.  Mucilage formation, which is a secretion released into seawater in response to changes and anomalies in sea conditions, requires a stagnant sea as well as a high amount of nitrogen and phosphorus contents.  Mucilage, which is a part of a natural process under normal conditions, can expand excessively when the weather gets warmer in the spring months and it finds the right temperature and light.  However, as in the case of the Sea of Marmara, experts say the structure of the sea, as well as intense pollution and waste, and global climate change, are the main reasons beyond such intense mucilage formation.
    Post a Comment
    Read more