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23 lessons,
3h 1m
Practice MCQ's- Environment & Ecology 10
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Highly recommended for MPPSC/UPSC Exam

Sudarshan Gurjar is teaching live on Unacademy Plus

Sudarshan Gurjar
Top & Verified Plus Educator. Winner of Perfect Presence Award!! Mentored more than 10,000 students.

Unacademy user
The LoP Excuse------- Indian Express A good article regarding Lokpal issue along with some facts and comments useful for answer writing.
Deepanshu Singh
2 years ago
Similar article from The Hindu is covered in previous summary regarding Lokpal and the LoP issue
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  4. Consider the following statements regarding dissolved oxygen in an aquatic ecosystem: 1. It increases with increase in temperature of a water-body. 2. Its concentration in fresh water is usually more than the concentration of Oxygen in air. 3. Snow cover of ice on water reduces dissolved oxygen concentration. Which of the statements given above is/are correct? (a) 1 and 2 only (b) 3 only (c) 1 and 3 only (d) 1, 2 and 3

  5. Answer B Statement 1 is incorrect. The solubility of oxygen decreases as temperature increases. Warm water also enhances the decomposer activity There dissolved oxygen concentration decreases, not increases, with increase in temperature of water-body Statement 2 is incorrect. Its concentration in fresh water is usually more than 100 times less than the concentration of Oxygen in air. Statement 3 is correct. Snow cover doesn't allow transfer of oxygen from atmosphere. It also reduces the photosyn hess-activities by aquatic plants Thus, there is reduction in dissolved oxygen concentration

  6. Which of the following measures can improve air quality in an urban area? 1. Having artificial rain. 2. Increasing parking charges for private vehicles. 3. Installing waste to energy power plants based on incineration. Select the correct answer using the code given below (a) 1 and 2 only (b) 2 only (c) 1 and 3 only (d) 1, 2 and 3

  7. .Answer A .Statement 1 is correct: Artificial rain would lead to settling of PM2.5 and PM10 particles on the ground. Thus, air quality would improve. Statement 2 is correct: Increasing parking charges would lead to less number of vehicles on the streets. Thus, reduction in pollution level. Statement 3 is not correct: Waste to Energy plants based on incineration technique solve the problem of solid waste management but they emit hazardous gasses. Thus, their installation in the city can't improve air quality .Smoke and ash emitted by the chimneys of incinerators include acid gases nitrogen oxide, heavy metals, particulates, and dioxin, which isa carcinogen. While incineration pollution control technology is evolving to reduce these pollutants, it has been found that even with controls in place, some remaining dioxin still enters the atmosphere