Science 'N' us-3 final - School Books Publishers India

4.BIRDS : STRUCTURE AND FLIGHTExerciseA. Answer the following questions :1. Name the parts in which the body of a bird can be divided.Ans. Body of a bird can be divided into four major parts- head, abdomen,wings and tail.headwingsabdomentail2. What do you know about the shape of a bird?Ans. Body of the bird is light, thin and boat-shaped which helps in flight. Thebones in the body of a bird are very few and are thin and hollow. Thelight weight of bones helps the bird in flying. The two wings of the birdhelp in flying and regulating its speed. The tail of a bird useful inchanging the direction of flight. The muscles cause movements inwings and thus enable flying.3. Write two qualities of bones of a bird.Ans. (i) The light weight of bones of a bird helps the bird in flying.(ii) The bones of a bird are very strong despite being thin and hollow.4. What is the role of tail in bird's body?Ans. The tail of a bird helpful in changing the direction of birds flight.5. Which birds are called flightless birds and why?Ans. Ostrich, kiwi and penguin are some flightless birds. These birds cannotfly due to their heavy weight.B. Choose the correct word from side box and fill in the blanks :1. Bones of the bird are hollow. wings2. Wings help in flying. tail3. Tail gives direction while flying. hollow4. Birds fly in air. air5. Body of the bird can be divided into four major parts. fourC. Write :1. Two birds which cannot fly :(a) ostrich(b) penguin2. Two birds which fly at great heights and for longer distances :(a) eagle(b) hawk3. Two birds which fly for very short distances :(a) peacock(b) hen4. Two birds which fly at low heights but for longer distances :(a) pigeon(b) parrotHorizon Press48Science 'n' Us - 1 to 5