Summarize what happens in Photosystem I and II. Focus on what is needed to start each system and what is produced by each.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )