This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Green plants are called producers because they supply food to the entire animal kingdom as well as humans and we know that we obtain food from them so they are called producers
Green plants are the only ones which can prepare food for itself as well as for other animals. So, they are called as "producers" as they produce food for the herbivores which become the food for the carnivores. So ultimately, plants ( green plants) are the "producers" of food