Direction: Read the following passage carefully and answer the questions. Your answer to these questions should be based on passage only.
As concern about radiation from phones and base stations continues to grow, health experts advice a change of habits-spending less time on the phone, using landline, and texting rather than calling-to cut the risk. The risk of brain cancer as a result of excessive use of phones cannot be ruled out. Reduced use of mobile phones is advised, Cancer is an extreme example. We get many cases of parents complaining that their children lack concentration, get headache and have behavioral problems. This cannot be proved, though. A scientist with ICMR said exposure to radio frequency radiation has a thermal effects, caused by holding a phone close to the body, and also a non-thermal effect which can be attributed to the induced electromagnetic effects inside biological cells. The non-thermal effect is possibly more harmful. People who are chronically exposed to low level wireless antenna emissions and users of mobile phone handsets have reported feeling several unspecific symptoms.