Solution:
Plastoquinone is mobile electron carrier between PSII and cytochrome b6/f complex and Plastocyanin is mobile electron carrier between cytochrome b6/f and PSI.
The mobile electron carriers of photosynthetic electron transport are
Plastoquinone is mobile electron carrier between PSII and cytochrome b6/f complex and Plastocyanin is mobile electron carrier between cytochrome b6/f and PSI.