Question

the series of molecules through which excited electrons are passed down thylakoid membrane is called ​

Answer 1

The series of molecules through which excited electrons are passed down thylakoid membrane is called electron​ transport chain.

In electron​ transport chain, the transfer of electron occurs from the element which loses electron to the element which receives electron through a membrane like structure called thylakoid membrane . This occurs in redox reaction means one atom is reduced i. e. gain electron and other is oxidized i. e. loses electron.