1. Explain the locomotion in a cockroach, a snail and a snake.
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Answer:
Animals have their own way of movement or locomotion.
locomotion in cockroaches
Cockroach is an arthropod with six jointed legs. Six legs of the insect help it to walk, and two pairs of wings help it to fly. Cockroach does not possess any bones making up endoskeleton.
Exoskeleton is the hard and stiff outer covering of the body made up of chitin. Exoskeleton is a jointed structure which helps in the movement of the body. A cockroach moves its legs with the help of muscles near the limbs. It uses its breast muscles to move its wings and fly. A cockroach can walk, fly and even climb.
locomotion snails
Snail is a small molluscan Snail is protected by its external skeleton called as shell. Snails are found in wet places. Entire body except the foot lies inside the shell. When disturbed, snail even retracts the foot in to the shell. Snail moves with the help of single muscular foot. The under surface of the muscular foot is lubricated with mucus. The muscular foot glides over the surface. The rhythmic contractions and relaxations of this muscular foot brings about pulling action in the body. The secreted mucus also reduces the risk of injury from sharp objects.
locomotion in snakes
Snakes are vertebrates with vertebral column. Body is supported by a skeleton made up of vertebrae which run continuously from head to tail. As they do not have any limbs, snakes do not have appendicular skeleton. Snakes move in a loop-like, zig-zag manner. They cannot move in a straight line. They have difficulty in moving on very smooth surfaces. Snakes have a long back bone and many interconnected muscles that help them to slither. They have muscles connecting the backbone, ribs and skin. Snakes move in grass, sand and water. Though the snakes do not have arms or legs, they can climb trees.
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