Here's a conversion worksheet for noun clauses in the theme of nature and environment. The WH- or Yes/No questions are converted and embedded into sentences as noun clauses. It's a simple task but it needs practice.
This PDF worksheet set has also got A&B versions. The whole worksheet is divided into A and B question sets, which have relatively the same difficulty compared to each other.So, you can distribute them evenly and ask them to check other's worksheets. It'll also increase classroom interaction and reinforce reciprocal learning.