There____some bread and two eggs on the plant.

is
there be 结构be 的单复数使用就近原则,即看和be 近的那个名词的单复数概念 后者不必考虑
例如：There__is__some bread and two eggs on the plant.
但是：There_are___two eggs and some bread
再例如：there is a book and two pens in the desk
但是：there are two pens and a book in the desk.