Question

Name the structures associated with locomotion in the following
organisms- Snail and Birds.

Answer 1

Answer:

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Answer 2

• Snail
• The rounded structure a snail carries on its back is called the shell and it is the outer skeleton of the snail, but is not made of bones. The shell is a single unit and does not help in moving from place to place. It has to be dragged along. The snail can even hide its head inside the shell.

• For movement a thick structure and the head of the snail come out of an opening in the shell. The thick structure is its foot, made of strong muscles. The under surface of the muscular foot is lubricated with mucus, which helps in movement and also reduces the risk of injury from sharp objects. Waves of muscular contractions along this surface help a snail move.

• Birds
• Birds fly in the air and walk on the ground. Some birds like ducks and swans also swim in water. The birds can fly because their bodies are well suited for flying. Their bones are hollow and light, and they don’t have a urinary bladder. These features help them to fly easily.

• The bones of the hind limbs are typical for walking and perching. The bony parts of the forelimbs are modified as wings. The shoulder bones are strong. The breastbones are modified to hold the muscles of flight, which are used to move the wings up and down. The tail controls the direction of flight.