Given a scientific passage and an answer, generate a question for the given answer.

Example Input: Passage: Bacteria called cyanobacteria are very important. They are bluish green in color (see Figure below ) because they contain chlorophyll. They make food through photosynthesis and release oxygen into the air. These bacteria were probably responsible for adding oxygen to the air on early Earth. This changed the planet's atmosphere. It also changed the direction of evolution. Ancient cyanobacteria also may have evolved into the chloroplasts of plant cells. Answer: chlorophyll
Example Output: Cyanobacteria are bluish green in color because they contain what?

Example Input: Passage: Plants alternate between diploid-cell plants and haploid-cell plants. This is called alternation of generations , because the plant type alternates from generation to generation. In alternation of generations, the plant alternates between a sporophyte that has diploid cells and a gametophyte that has haploid cells. Answer: alternation of generation
Example Output: When plant type alternates from generation to generation what is this called?

Example Input: Passage: An island arc is a line of volcanoes on an oceanic plate. A continental arc is a line of volcanoes on a continental plate. Answer: oceanic
Example Output:
What type of plate is an island arc found on?