quantity on pages showing products of specific category

Hi. I have a page where customers can see products of different categories (with tabs). For some products, I set a min quantity of 2. However, this functionality doesn’t work in the page since it tries to add only 1. I also don’t have quantity field beside add to cart button. Is there any php snippet to hook to add to cart function to take min. quantity from product’s setting when adding to cart? I don’t need customers to select quantity (this can be done in cart page).