Subject :NSO Class : Class 7
Landowner of a village has decided to use one of his fields which had factories for several years for the production of crops. With which of the following substances does he need to treat his field for a long time to fulfill his purpose?
AOrganic matter
BQuick lime
CSlaked lime
DBoth B and C
Lime is used to make acidic soil neutral. It is not clear from this question how the soil is acidic.
Ans 1:
Class : Class 7
But it could be a washing factory in which soap water is thrown out. This will make soil basic.
Ans 2:
Class : Class 10
It is mentioned that the landowner has decided to use one of his fields which had 'factories' for several years. So it is considered that chemicals from these factories make the soil acidic...
Ans 3:
Class : Class 7
Factories in general means "manufacturing units" so we can consider that the waste water which is thrown out can be acidic in nature.