Hi Tanu,
I am referring a code this will definitely help you:-
<apex:pageBlockSection title=”Add New Account”>
<apex:inputField value=”{!acc.Name}”/>
<apex:inputField value=”{!acc.Website}”/>
<apex:inputField value=”{!acc.Phone}”/>
<apex:actionRegion>
<apex:selectRadio value=”{!kind}”>
<apex:selectOptions value=”{!choice}”/>
<apex:actionSupport event=”onchange” reRender=”up” action=”{!change}”/>
</apex:selectRadio>
</apex:actionRegion>
<apex:selectRadio id=”up” value=”{!fooditem}”>
<apex:selectOptions value=”{!offer}”/>
</apex:selectRadio>
</apex:pageBlockSection>