Depletion of ozone layer : Ozone layer gets depleted due to the use of chemicals called aerosol, spray propellants like chlorofluorocarbons. Depletion of ozone layer causes skin cancer in men and animals and severe damage to the plants. Direct exposure to ultraviolet radiations leads to skin and eye cancer in animals. Strong ultraviolet rays may lead to minimal growth, flowering and photosynthesis in plants. The forests also have to bear the harmful effects of the ultraviolet rays.1. Which of the following facts are incorrect?a. Global warming is the rise in the average temperature of the earth s climate systemb. Eutrophication is observed in water bodiesc. The greenhouse effect is a natural phenomenond. Ozone is harmless to breathe2. Carbon dioxide is primarily called a greenhouse gas because a. Traps heatb. Traps lightc. Traps warm currentsd. None of the above3. Depletion of the ozone layer is damaging to human health. Negative effects includea. Skin cancersb. Osteoporosisc. Dyspepsiad. None of the above4. Areas that are under the influence of DDT may observe a decline in the population of birds. This is due to the fact thata. Birds stopped laying eggs altogetherb. The eggs did not hatchc. Predation of the eggs increasedd. None of the above5. Measuring BOD (biological oxygen demand) is primarily used fora. Estimating the types of microbesb. Determine the level of dissolved oxygenc. Estimating the quantity of organic matter in sewage waterd. None of the above