Some of the ways in which water pollution affects plants may be fairly obvious. An increase in numbers or a dramatic swelling of a population can be relatively easy to detect. Other ways in which plants may be affected can be more subtle. Of, course besides known or observed effects there may well be those that are as yet unstudied and unknown.
Pollution may be caused with inorganic or organic pollutants, or with both. Water pollution with metal ions may lead to the toxicity of those of high concentrations, and in the meantime to the less absorption of others that may be essential for plant growth and development. The usual symptoms of such toxicities and deficiencies are chlorosis (yellowish coloring) and necrosis. Organic pollutants may be of direct impact on plants similar to those imposed with herbicides and their residues, may cause pH changes in water and affect the solubility of plant nutrients, or may trap ions as chelating agents. Also, changes in biology of the water may be resulted from water pollution.
It is yet to Know type of pollutants because some pollutants cause nuclear degeneration in plants resulting pollen sterility some pollutants such as Industrial wastes of several kinds result crop degradation such as either increase or decrease in crop yield and quality of products it is a wast subject depending on the type of pollutant
Depends on the type, concentration and properties of the pollutants.
agree with Dr, Jacob and may add that also depend on plant species if working botanical field.
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