Google plus account is created in default with creating a new Gmail account. You can delete your Google plus account easily. If you are not using Google Plus you can do this.
Steps for deleting your Google Plus account:
- Go to plus.google.com and login with your account.
- Go to account.
- Click on Data Tools.
- For deleting Google account, Click Delete Google+ profiles and Features.
- A new page appears, read those and at end tick the option. Select Remove selected services.
- Then your Google plus accounts deleted.