'No' is directly or indirectly contradicted in the text. 'Not given' is not mentioned at all. e.g. "Sun exposure is one of the major factors contributing to skin damage." Spending time in the sun has very little impact on skin. - No. The sentence says the opposite - direct contradiction. Drinking plenty of water can improve skin health. - Not given. - Drinking water is not mentioned.

For the answer to be 'No' or 'False', there has to be information in the text which explicitly contradicts the statement. If it looks as though it is 'half right', it may be a 'Not Given'. 'Not Given' statement often repeat some of the words in the text, but the overall meaning of the statement does not reflect anything mentioned in the text. By the way, I am an experienced IELTS examination writer and consultant for Cambridge ESOL.

In my opion,"NOT GIVEN" is related to something that the writer don't metione in her article,while 'NO" is what the writer don't agree with

I agree with the three who've already answered. The expression is used almost exclusively on multiple choice reading or listening comprehension exam questions. True (the text says so), False (the text says the opposite), or Not given (the text doesn't answer the question).

No is negative. Not given is unprovided.