does database table "tbl_paramhead" have data in it?
have you checked the view source to check whether the drop down is generated properly...if yes, then if should work
You haven't set value in dropdown options, check below line
echo '<option value>' .$row['paramhead']. '</option>';
use it as
echo '<option value="'.SOME_VALUE.'">' .$row['paramhead']. '</option>';
You haven't passed link identifier returned by mysqli_connect() to mysqli_query() function
Check Manual for more details: http://php.net/manual/en/mysqli.query.php
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