Do we need to remember such things for exam? 
(Given in NCERT) please answer genuinely:


Dear Student,

a. These boxes are meant to create a better understanding of the topic concerned.
b. You don't have to mug them . For instance the above box explains the input output process.
c. You may be given a table and a question may be asked pertaining to the box.
d. However, there are boxes in the history which have to learn as questions have been asked in the previous papers.
e. We recommend you to go through them in detail  and pick up key points , as questions can be asked from them.


Regards

 

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Aluminium smelting and. Chemical industy are not in our course it has been excluded i have seen in the cbse syllbus
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Genuinely saying
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this part is not coming.
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That means aluminium smelting theory part which is given in our book is also not necessary..

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@IPSEETA DAS yes and even not chemical industry given on the next page
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yes,genuinely
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