T here are some apples in the tree(对划线部分提问）在SOME APPLES 下面划写错啦应该是 There is picture on the blackboard（对划线部分提问）在picture的底下划线啊
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保证正确!答案：What is (there) in the tree?
此句的there一般省略不用.
单独用what/who提问,谓语动词用单数(is).
======以下答案可供参考======
供参考答案1:
What is that on the blackboard?
供参考答案2:
there are 表示存在，此句=some apples are in the tree.所以很显然，划线some apples就是对主语提问，答案应该是what's in the tree.
供参考答案3:
what is there on the blackboard?