You can tap, of course, in the right place; or you swipe broadly to the right in the iPhone's Camera app to see the latest photo it took. Then, you can browse the roll and return to taking pictures by swiping left on the most recent image.
You can use IMAP, of course, to access your Zoho Mail account in iPhone Mail and have it check for new important mail every so often on its own; or you use the Exchange ActiveSync interface and see messages in iPhone Mail just about the moment they arrive:
›› Want to get mail on your iPhone the moment it arrives, practically, in your Zoho Mail account? Here's how to set up push Zoho Mail (using Exchange ActiveSync) in iPhone Mail.