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प्रश्न
What is a streamlined body? How does it help in the movement of animals that fly or swim in water?
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उत्तर
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A streamlined body is one which is pointed at the ends and broad in the middle. When such a body travels through a fluid or gaseous medium it exhibits minimum friction or resistance. A body shape which is streamlined helps cut against the friction created by the medium around the moving body.
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Streamlined body lowers the friction drag between a fluid, air, or water and an object moving trough that fluid. Drag is a force that slows down motion. Streamlining reduces the surface area of the moving object.
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Streamlining reduces the friction of movement to a minimum thus decreasing overall drag. Fishes can save energy while swimming because of the streamlined body.
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संबंधित प्रश्न
Very Short Answer Type Question:
Name two animals which move without bones.
Very Short Answer Type Question:
Name a bird which can swim in water.
Very Short Answer Type Question:
How does the snake move?
Very Short Answer Type Question:
Name three animals that have streamlined body.
Match the items in Column I with one or more items of Column II.
| Column I | Column II |
| Upper jaw | have fins on the body |
| Fish | has an outer skeleton |
| Ribs | can fly in the air |
| Snail | is an immovable joint |
| Cockroach | protect the heart |
| shows very slow movement | |
| have a streamlined body |
How does the fish change direction?
Name the types of movements seen in animals.
Given below is a list of different types of movements in animals.
[Running, Jumping, Walking, Slithering, Crawling, Flying, Swimming, Creeping]
Duck
Unscramble the jumbled word and write it in the blank space provided.
tnemevom ................
In the following figure there are two snakes of the same size slithering on the sand. Can you identify which of them would move faster and why?
