Subject :NSO Class : Class 8
Refer to the given experimental set up as shown in the given figure and select the correct option regarding it.
A In X, yeast causes fermentation which converts sugar into lactic acid and carbon dioxide.
B In Y, oxygen gas is released while carbon dioxide gas is absorbed.
C In Y, lime water turns milky.
D Both (B) and (C)
how is option [A] wrong
Ans 1:
Class : Class 8
answer cant be A since during fermentation of sugar alcohol is produced and not lactic acid
Ans 2:
Class : Class 9
Option a is wrong because yeast does not convert sugar into lactic acid.
Ans 3:
Class : Class 8
Option C is the correct answer because yeast causes fermentation .Fermentation is an anaerobic process. In this process yeast converts sugar into alcohol and carbon dioxide. Lime water turns milky indicating the presence of carbon dioxide.
Ans 4:
Class : Class 8
I think that option A and C should be correct. Since option A talks about fermentation occuring which could be true considering that yeast is put into warm sugar solution. Option C is also correct since we know that one of the end products of fermentation is CO2 and lime water turns milky white when it is combined with carbon-dioxide.
Ans 5:
Class : Class 8
Then option A should also be correct as it talks about fermentation