Write the harmful effects of fungi and algae.
Some fungi causes diseases and food spoilage. Smuts and rusts are fungi that damage the crops. Ring-worm and athletes foot diseases are caused by fungi. Amanite mushrooms contain poisonous substance. Moulds that appear on bread lead to its spoilage.
Algae are great nuisance as they spoil the drinking water by degrading its quality. Excess growth of algae also blocks the movement of water in channels.