JAMB - Biology (1997 - No. 38)
After a heavy rainfall and the formation of a large pond, the most likely sequence of changes in the vegetation of the pond is
Euglena → water lily → Spirogyra → grass
water lily → Spirogyra →grass → Euglena
Spirogyra → Euglena → grass → water lily
Euglena → Spirogyra → water lily → grass