Question

why alage are harmful plants​

Answer 1

Answer:

Blocking of photosynthesis: The epiphytic algae which are found upon other plants and trees block photosynthesis and indirectly harm the trees and plants.

Answer 2

Drinking algae-affected water or consuming food (such as fish or shellfish) containing toxins can lead to gastroenteritis, which can induce vomiting, diarrhoea, fevers and headaches. These toxins may also affect the liver or nervous system