JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>
            <input type="checkbox" name="check1" id="check1"/>Process 1:</td>
        <td>
            <select id="process1" name="process1" onchange="setChk(this.value);">
                <option value="null">--Select Process--</option>
                <option value="NameA">NameA</option>
                <option value="NameB">NameB</option>
                <option value="NameC">NameC</option>
            </select>
        </td>
    </tr>
</table>

JavaScript

function setChk(value){
    var chk = document.getElementById('check1');
    chk.checked = (value != 'null');
}