Tick check box if one or more text defined text fields contain content

I hope someone can provide a quick fix to this being I'm a novice at this stuff!!

I have several text fields in a form. I want to ensure that a hidden checkbox (rMoths) field is ticked if any of the defined fields (e.g. Flower) contains a value.

1. How do I do this with multiple fields, say Flower, Robin, Starling, Pigeon and ensure that the checkbox remains ticked unless all defined fields have their values removed?

2. I need to ensure that if a 'space' (space bar) character is entered into any of the defined fields and no other character (i.e. a true value) is entered then the field is ignored and does not trigger the checkbox to be ticked.

Using JQuery script I have this working for a single field (Flower) see code below but need to apply to multiple named fields listed in point 1 above and address point 2.

<script>         
    $(document).ready(function() {
    $("input.Flower").on("keyup blur", function() {
    $("input.Moth").prop("checked", this.value != "");
    });

    $("input.Moth").click(function() {
    return false;
    });
    });    
</script>

Many thanks

Steve