All Form fields Data inserted except select dropdown field array in mysql database

Question

I am working on project where i have to insert data into mysql database using jquery serialize function. All data is inserted well except data from select tag. I have spent two days but not able to understand where i am wrong. here is my jquery code.

<script>
    $(document).ready(function(){
    $("#addfields").click(function(e){
    e.preventDefault();
        $.ajax({
            url: "makeschedule.php",
            type: "post",
            data: $("#scheduleform").serialize(),
            success: function(d) {
                 alert(d);
            }
        }); 
    });
    });
</script>

<form method="post">
    <select class="form-control" id="fromtime" name="fromtime">
        <?php
            for($i=1;$i<=12;$i++)
                {                   
                echo "<option value='$i'>$i.00</option>";
                }
        ?>                  
    </select>

    <select class="form-control" id="totime" name="totime">
        <?php
            for($i=1;$i<=12;$i++)
                {                   
                echo "<option value='$i'>$i.00</option>";
                }
        ?>                  
    </select>
    <a href="#" class="" id="addfields" name="addfields"><img src="imgs/icons/add.png" height=35 width=35></a>
</form>

And PHP Code is :

<?php
if($_POST)
{
$userid=$_SESSION['s_userid'];
$userid=2;
$day=  mysqli_real_escape_string($_POST['day']);
$fromtime= mysqli_real_escape_string($_POST['fromtime']);

$time1=    mysqli_real_escape_string($_POST['am_pm1']);
$totime=  mysqli_real_escape_string($_POST['totime']);
$time2=  mysqli_real_escape_string($_POST['am_pm2']);

$qry="insert into a_yogischedule(id,userid,dayofweek,starttime,endtime,date) values(NULL,'$userid','2','$fromtime','$totime',now())";

$r=$dbconn->query($qry);
   if($r)
       echo "Success";
   else 
       echo "Fail";

}
?>

Thanks in advance.