Long Answer Type Questions
31. What is the importance of oxygen gas dissolved in water ? How is the carbon dioxide gas dissolved in way
helpful to the plants which live in water ?
32. (a) What is a material ? Give five examples of materials.
(b) Classify the following objects on the basis of the nature of their material :
Cricket bat; Pressure cooker; Beaker; One rupee coin; Book; Screw; Drawing sheet; Mirror; Calendar; Tabs
33. What is meant by hard materials and soft materials ? Give two examples of hard materials and two of se
materials.
34. What is meant by transparent materials, translucent materials and opaque materials ? Give two examples ead
of transparent, translucent and opaque materials.
35. (a) State one difference between living objects and non-living objects.
(b) Classify the following objects as living and non-living objects :
Ball pen; Child; Note-book; Rabbit; Chair; Sparrow; Coconut tree; Stone; Fish; Football.
36. (a) Mention one difference between plants and animals.
(b) Classify the following objects as 'plants' and 'animals' :
Mosquito; Mushroom; Rat; Goat; Lotus; Paddy; Frog; Algae; Snail; Snake.
Answers
31)=Oxygen gas dissolves in water. The plants and animals which live in water use the oxygen dissolved in water for respiration. Thus, oxygen gas dissolved in water is very important for the survival of animals and plants that live in water...
32)(a)=Examples of materials are wood, glass, plastic, metals(copper, aluminum, silver, gold) , steel, stainless steel, paper, rubber, leather, cotton, silk , sand, sugar, wool, nylon, polyester, water, soil etc....
32)(b)=Answer:
Materials made of copper: Pressure cooker, one rupee coin, Drawing Sheet.
Materials made of wood: Cricket bat, table.
Materials made of Aluminium: Mirror
Materials made of Parchment: Book, Calender
Materials made of glass: Beaker
Materials made of carbon steel wire: Screw...
33)=Those materials which cannot be easily compressed, cut, bent or scratched are called hard materials. Examples: Iron, glass. Those materials which can be easily compressed, cut, bent or scratched are called soft materials. Examples: Sponge, Cotton....
34)=Some examples are: Transparent: Clean glass, water, air. Translucent: Frosted glass, wax paper, butter paper, smoke. Opaque: Stone, metal, wood.....
35)(a)=Non-living things do not eat, grow, breathe, move and reproduce.
...
Difference between Living and Non-living things.
Living Things Non-Living Things
Living organisms undergo growth and development. Non-living things do not grow or develop.
They have a lifespan and are not immortal. They have no lifespan and are immortal....