Air pollutants - effects on plants, Biology

Air pollutants - Effects on plants

Particulate matter such as cement, coal, petro coke, dust, and fly-ash screen the light and thus change its quantity and quality. Dust plugs stomata and decreases exchange of gases and transpiration. On wet plant parts dust gives alkalinity to the surface. However, some studies indicate that low concentration of fly ash can enhance the plant growth and may be considered desirable supplement to fertilisers. Ozone causes Chlorosis, spotted leaves due to oxidation, burning of leaf tips, weakening, early leaf fall, reduction in growth and yield. Ozone harms leafy vegetables, field crops, fruits and forests trees.

Tobacco is highly sensitive to ozone. Oxides of nitrogen oxidise chlorophyll resulting in Chlorosis, leaf damage. They may cause reduction in growth, yield, and fruit fall. Since air gets contaminated with several pollutants evolved from a single source, damages result from the cumulative effect of two or more gases. Moreover, the observed symptoms cannot be distinguished from those due to physiological stress factors such as light, temperature, humidity, nutrients etc. Mixtures of gases, SO2 and O3 SO2 and HF show synergetic effects. We have mentioned earlier that particulate matter potentiates the effect of SO2. Acid deposition can leach vital plant nutrients such as calcium from the soil by forming insoluble salts. It can also release aluminium ions bound to the soil into soil water. Aluminium ions damage fine root hairs, thus reducing absorption of water. Increase in pH kills essential soil microorganisms.

Acid deposition can change ion uptake in plants. However, certain species of plants respond to pollutants more than others. For instance, mosses and lichens are highly sensitive to air pollutants and get severely damaged by low levels that do not induce responses in human and other animals. The highly sensitive nature of lichens, mosses and other plants have been used to indicate pollution levels. Such plants are often referred to as bio indicators of air pollution.

Posted Date: 1/21/2013 4:33:32 AM | Location : United States







Related Discussions:- Air pollutants - effects on plants, Assignment Help, Ask Question on Air pollutants - effects on plants, Get Answer, Expert's Help, Air pollutants - effects on plants Discussions

Write discussion on Air pollutants - effects on plants
Your posts are moderated
Related Questions
What is Burden of Rheumatic Heart Diseases? Although in the twenty-first century RHD has been eradicated in western countries, in India and other developing countries it contin

Social Determinants of Health - Transport Rising worldwide incomes have led to a massive use of automobiles and in particular cars. Cars are seen as a threat to health because

Q. What is the ADP phosphorylation? What respectively are oxidative phosphorylation and photophosphorylation? ADP phosphorylation is the addition of one inorganic phosphate in

how do i prove in a diagram that water is needed for photosynthesis

How would carbon monoxide poisoning affect a person's coloring, particularly of the mucous membranes? How would it affect the hemoglobin concentration, hematocrit, and percent oxyh

Which of the following assist in the digestion of fats? A. Production of bile salts in the liver and the secretion of those bile salts into the small intestine. B. Emulsific

Q What are the three periods into which interphase are divided? Interphase is the preceding phase to the mitotic division. It is divided into three periods, G1, S and G2 the le

What is the feeding habitat of branchiostoma?

Cytoplasmic inclusions are cytoplasmic molecular aggregates, like as pigments, organic polymers and crystals. They are not considered cell organelles. Fat drops and glycogen gra

Define the Energy Cost of Growth? The energy cost of growth has two components: 1) The energy needed to synthesize growing tissues; and 2) The energy deposited in these tis