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III) True or false ( Give reasons for choice )
i) Milk is good source of vitamin c .
Answer : true . milk contains many vitamins and include vitamin c too .
ii) Rusting of iron is an irreversible change .
Ans : True , We cannot get iron back from rusted iron. Rusting of Iron is a chemical change.
iii) Animals living in mountains have thin skin .
Ans : false . As air rises, the pressure decreases. It is this lower pressure at higher altitudes that causes the temperature to be colder on top of a mountain. So animals their cars gifted with thick skin rather than thin skin, in order to fight with cold temperatures.
iv) A javelin thrown in the air has translatory motion .
Ans: True , Translational motion is the motion by which a body shifts from one point in space to another.
v) we can remove impurities from water by churning.
Ans : False , churning will rather mix up the dirts .
vi) Opaque object do not allow light to pass through them .
Ans : True, Light cannot shine through opaque materials at all. In fact, opaque materials absorb the light that shines on them.
vii) Carbon dioxide is used by plants .
Ans : true , Carbon dioxide is used by plants in the process of photosynthesis.
6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen.
viii) domestic sewage is non biodegradable waste .
Ans : False , Waste which cannot be decomposed or degrade by the biological process is known as “Non-biodegradable wastes”, whereas , domestic waste contains , vegetables peel which are absolutely biodegradable waste .
ix) Air is mixture of gases .
Ans : true , air contains gases like 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. .
x) plants and trees help in preventing floods .
Ans : True , roots of plants and trees bind up and absorb the rain water , thus preventing floods .