Environmental Issues QUIZ-3
Dear Readers,NEET is the most famous and important medical entrance examination held in our country. This exam is an objective type, an offline test which includes 4 sections namely– Physics, Chemistry, Botany, and Zoology. The maximum marks that can be scored are 720 marks and have 180 questions.
About half of the paper consists of questions from Biology, as the NEET exam essentially focuses on capacitating students to go for seats in medical courses. One of the most significant and crucial sections in the NEET exam is of Biology. It comprises of theories, descriptions, discoveries, diagrams, definitions, explanations of differences, and relations. The majority of the topics covered in the NEET syllabus are from the NCERT syllabus of Class 11 & 12 and other related sources become part of the rest of the syllabus.
Clear Exam curates a list of articles selected by professionals who recommend the highly vital topics for NEET exams. The table below takes you directly to the respective topic where the in-depth article and the MCQs are available for an easy and productive learning experience. Prior to solving NEET question papers or practicing mock tests, you must ensure to study the basic concepts in NEET and practice a few sample questions related to this exam. Students will be covered for all their studies as the topics are available from basics to even the most advanced.
Q1. Chipko movement was successfully launched by
Solution
Sundar Lal Bahuguna. Chipko Movement was started in Garhwal, Himalayas in 1974 by Shri Sundar Lal Bahuguna to prevent cutting down of trees. Local woman hugged trees to prevent their cutting by the contractors
Sundar Lal Bahuguna. Chipko Movement was started in Garhwal, Himalayas in 1974 by Shri Sundar Lal Bahuguna to prevent cutting down of trees. Local woman hugged trees to prevent their cutting by the contractors
Q2.Measuring Biological Oxygen Demand(BOD) is a method used for
Solution
Estimating the amount of organic matter in sewage water. Biochemical Oxygen Demand (BOD) is a measure of pollution by organic matter present in a sample of water BOD is higher in polluted sewage water and is connected with both microbes and organic matter. More the organic pollution, specially sewage, more would be the BOD of water
Estimating the amount of organic matter in sewage water. Biochemical Oxygen Demand (BOD) is a measure of pollution by organic matter present in a sample of water BOD is higher in polluted sewage water and is connected with both microbes and organic matter. More the organic pollution, specially sewage, more would be the BOD of water
Q3. DDT residues are rapidly passed through food chain causing biomagnifications because DDT is
Solution
Many of the pesticides, such as DDT, aldrin and dieldrin are accumulated in the environment. They are fat soluble and generally non-biodegradable. They get incorporated into the food chain and ultimately deposited in the fatty tissues of animals and humans. In the food chain, because of their build up, they get magnified in the higher trophic levels called biological magnification. The phenomenon of biological magnification is also reported for certain other pollutants such as, heavy metals, e.g. mercury, copper and radioactive substances as strontium-90.
Many of the pesticides, such as DDT, aldrin and dieldrin are accumulated in the environment. They are fat soluble and generally non-biodegradable. They get incorporated into the food chain and ultimately deposited in the fatty tissues of animals and humans. In the food chain, because of their build up, they get magnified in the higher trophic levels called biological magnification. The phenomenon of biological magnification is also reported for certain other pollutants such as, heavy metals, e.g. mercury, copper and radioactive substances as strontium-90.
Q4. Deforestation refers to
Solution
Disappearance of forests. Deforestation is the removal of a forest or stand of trees where the land is thereafter converted to a non-forest use. Examples of deforestation include conversion of forest land to farms, ranches or urban use
Disappearance of forests. Deforestation is the removal of a forest or stand of trees where the land is thereafter converted to a non-forest use. Examples of deforestation include conversion of forest land to farms, ranches or urban use
Q5.Consider the following statements about eutrophication
I. Eutrophication is the natural ageing of a water body by nutrient enrichment
II. The accelerated ageing of lakes due to sewage and agricultural and industrial wastes is called cultural or accelerated eutrophication
III. The plant nutrients responsible for eutrophication are nitrates and phosphates
IV. Phosphates and nitrates accelerate the growth of algae which utilise oxygen and may deoxygenate the water enough to kill the fish and other aquatic animals
Which of the statements given above are correct?
Solution
Eutrophication is excessive growth of algae, plants and animals in water-bodies due to the nutrient enrichment particularly with nitrogen and phosphorous. Eutrophication is both natural and accelerated. Natural eutrophication is nutrient enrichment of a water-body due to natural ageing Accelerated eutrophication is nutrient enrichment of water-bodies plants and due to human activities like passage of sewage, industrial effluents and run off from fertilised fields rich in nitrates and phosphates. Nutrients present in sewage, agriculture wastes and fertilisers cause dense growth of plants and planktonic algae. These are toxic to animals and humans
Eutrophication is excessive growth of algae, plants and animals in water-bodies due to the nutrient enrichment particularly with nitrogen and phosphorous. Eutrophication is both natural and accelerated. Natural eutrophication is nutrient enrichment of a water-body due to natural ageing Accelerated eutrophication is nutrient enrichment of water-bodies plants and due to human activities like passage of sewage, industrial effluents and run off from fertilised fields rich in nitrates and phosphates. Nutrients present in sewage, agriculture wastes and fertilisers cause dense growth of plants and planktonic algae. These are toxic to animals and humans
Q6. SO_2 pollution affects
Solution
At cellular level, SO_2pollution destroys all membrane systems. In intense exposure to SO_2, these is bleaching of leaf pigments due to conversion of chl. –a to phaeophytin-a. Thus, SO_2exposure has an impact on plant productivity. SO_2 pollution is the main cause of acid rain, which is threatening the shining of Taj Mahal. Mosses and lichens are very sensitive (indicator) to SO_2 pollution.
At cellular level, SO_2pollution destroys all membrane systems. In intense exposure to SO_2, these is bleaching of leaf pigments due to conversion of chl. –a to phaeophytin-a. Thus, SO_2exposure has an impact on plant productivity. SO_2 pollution is the main cause of acid rain, which is threatening the shining of Taj Mahal. Mosses and lichens are very sensitive (indicator) to SO_2 pollution.
Q7.Term used for accumulation of non-degradable pollutant in higher trophic level is
Solution
Biological magnification is the process by which heavy metals and pesticides become more concentrated at higher trophic level of food chain. Eutrophication is accelerated by introduction of massive amounts of nutrients by human activity.
Biological magnification is the process by which heavy metals and pesticides become more concentrated at higher trophic level of food chain. Eutrophication is accelerated by introduction of massive amounts of nutrients by human activity.
Q8.Which of the following groups of gases cause photochemical smog?
Solution
O_3, PAN (Peroxy Acetyl Nitrate) and NO_2 are responsible for photochemical smog.
O_3, PAN (Peroxy Acetyl Nitrate) and NO_2 are responsible for photochemical smog.
Q9.The soil pollutants that effect the food chain and fod web by killing microorganisms and plants are
Solution
Pesticides are the chemicals that repel or destroy the weeds, pathogens and other pests and thus, affect the food chain and food web. These chemicals may remain present in soil as pollutants.
Pesticides are the chemicals that repel or destroy the weeds, pathogens and other pests and thus, affect the food chain and food web. These chemicals may remain present in soil as pollutants.
Q10. catalytic converters are fitted into automobiles to reduce the emission of harmful gases.Catalytic converters changes unburnt hydrocarbons into
Solution
As the exhaust emission passes through catalytic converter, nitric oxide splits into nitrogen and oxygen; carbon monoxide is oxidised to carbon dioxide and unburnt hydrocarbons get burnt completely into CO_2 and H_2 O
As the exhaust emission passes through catalytic converter, nitric oxide splits into nitrogen and oxygen; carbon monoxide is oxidised to carbon dioxide and unburnt hydrocarbons get burnt completely into CO_2 and H_2 O
