Question

Nisha clean the wall of her terrace which had algae all over it after a couple of days she found algae growing again how did this happen

Answer 1

algae reproduces by spore formation or cell division. while cleaning the wall, some spores may have been left on the wall and have multiplied to form new algae structures. hence algae was found again after a few days

Answer 2

algae spore on the wall