State whether the statements are true or false.
i) Plants are the ultimate source of all energies,
ii) Amoeba produces its food by the process of photosynthesis,
iii) Acids present in large intestine kill bacteria which enter alongwith the food
iv) Wool traps more air in it than cotton,
v) A medium is required for heat transfer.
vi) White colour absorbs more heat than black colour.
vii) The pH value of common salt solution is 8.
viii) strectching of rubber band is a chemical change.
ix) It is easy to predict weather rather than climate.
x) Bases have pH value greater than 7.
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Answer:
i) False (sun)
ii) False (gets food by endocytosis)
iii) False (acids are present in the stomach which kill the bacteria in food)
iv) True
v) False (radiation is a process of transfer of heat that takes place across any medium)
vi) False (black absorbs more heat than white)
vii) False (pH value of NaCl is 7, it is a neutral salt)
viii) False (it is a physical change)
ix) False (It is easier to predict climate as it is the average weather pattern but the weather changes everyday)
x) True
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