DAV SCIENCE STD III

  Food D1.Name   the two sources of our food. Ans:The two sources of our food   are plants and animals. D2.Name the parts of plants which are used as food. Ans: The parts of plants which are used as food are root, leaf, stem, seeds ,flower, fruits and bud. D3.How do we obtain wheat flour? Ans:The wheat flour is obtained by grinding the wheat seeds. D4.Name any roots which are eaten as food. Ans: Carrots and radish are two roots which are eaten as food . D5.Why do we need to eat nuts? Ans: Nuts are rich in fats and protein. Nuts give us energy and warmth. So we need to eat nuts.       E1.Why are milk and milk products, regarded as good food for one and all? Ans:Milk and milk products contain all the   nutrient in more or less quantity. It is regarded as a complete food. Milk ful fill the   requirement of body, So it is regarded as a   good   food for one and all. E2.Why are green vegetable and fruits import...

  BIRDS AND THEIR NEST D1. Name three birds who work in pairs to make their nests. Ans:The birds who work in pairs to make nest are sparrow, dove and sunbird. D2. Why are birds called as aerial animals? Ans: Birds are called as aerial animals because they can fly in the air and spend most their time in air. D3. List some materials that are used by various birds to make their nests. Ans:The materials that are used by various birds to make their nests are: twigs, cotton, straw, own  feathers etc. D4. When and where does a barbet make its nests? Ans: Barbet makes its nest in the tree trunk during the summer season. D5. List some place where we find birds’ nests. Ans: The places where we find are- Meter room, top of the almirah, behind the shelf, electric pole, tree trunk etc. E1. Write any three features of birds that help them to fly. Ans:The feature that help bird to fly are: - i)The     hollow bone makes their body light. ii...