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NEET - Grade 12 - Biology - Environmental Issues - Introduction and Snapshot of Environmental Issues - Study ref# 983

Introduction: Human population size has grown enormously over the last hundred years. This means increase in demand for food, water, home, electricity, roads, automobiles and numerous other commodities. These demands are exerting treme... read more

NEET - Grade 12 - Biology - Environmental Issues - Introduction and Snapshot of Environmental Issues - Study ref# 984

Following sections must be covered to understand the Environmental Issues: 1. Air Pollution and Its Control 2. Water Pollution and Its Control 3. Solid Wastes 4. Agro-chemicals and their Effects 5. Radioactive Wastes 6. Greenh... read more

NEET - Grade 12 - Biology - Environmental Issues - Target Setup for Environmental Issues - Study ref# 985

Student requires to achieve the following milestones to get better grip over Environmental Issues. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Te... read more

NEET - Grade 11 - Chemistry - Environmental Chemistry - Study ref# 2234

Explain tropospheric pollution in 100 words. Answer: Tropospheric pollution occurs due to the presence of undesirable solid or gaseous particles in the air. The major gaseous and particle pollutants present in the troposphere are: (... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10746

Mention two advantages for preferring CNG over diesel as an automobile fuel. [U][Outside Delhi Set-I, 2016] Answer: Advantages of CNG:

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10747

Excessive nutrients in a water body cause fish morality. Give two reasons. [U][Delhi Set-I,2016] Answer: Excessive nutrients in a freshwater body cause fish mortality due to the follo... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10748

List two advantages of the use of unleaded petrol in automobiles as fuel. [R][Outside Delhi Set-I, 2015] Answer: The advantages are as follows:

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10749

Why should motor vehicles equipped with catalytic convertors used unleaded petrol? OR Why is it desirable to use unleaded petrol in vehicles fitted with catalytic converters? ... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10750

How de algal affect the life in water bodies? [U][Outside Delhi Set-I, II, III, 2011] Answer: Algal bloom causes deterioration of the water quality and aquatic life mortality. ... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10751

Lower BOD of a water body helps reappearance of clean-water organisms. Explain. [U][Foreign Set-I, 2016] Answer: Lowering of Biological Oxygen Demand (BOD) resul... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10752

Name any two sources of e-wastes and write two different ways for their disposal. [U][Delhi Set-I, 2013] Answer: Two sources of e-wastes are: televisions and computers. ... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10753

What is poly-blend? Why did the plastic manufacturers think of producing it? Write its usefulness. [A][Delhi Compt, 2011] Answer: Poly-blend: it is a fine powder of recycled modified plastic developed by a Bangalore –b... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10754

Mention now e-waste is produced and disposed-off. Write the solution for its treatment. [R][Outside Delhi Set-I,II, III, 2011] Answer: Irreparable computers and other electronic goods are known as electric wast... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10755

Explain accelerated eutrophication. Mention any two consequences of this phenomenon. [R][Delhi Set-I, II, III, 2011] Answer: Accelerated eutrophication occurs due to the passage of sewage and run-off... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10756

Plenty of algal bloom is observed in a pond in your locality.

(i) &nb... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10757

Our farmers still use DDT. How is this affecting the local bird population? [A][Delhi Set-I, Compt2015] Answer: As a result of bio-magnification, through an aquatic food chain, high concentr... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10758

“Determination of Biological demand (BOD) can help us in suggesting the quality of a water body.” Explain. [U][Delhi Set-I, 2015] ... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10759

With the help of a flowchart exhibit the events of Eutrophication. [U][Outside Delhi Set-II, 2015] Answer: Enrichment of water body by excessive nutrients is called eutrophi... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10760

How does a water body age naturally? Explain. State how this phenomenon of ageing of a water body gets accelerated. [U][Delhi Set-II, Compt. 2013] Answer: The natural ageing... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10761

(i) ... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10762

Why is the concentration of toxins found to be more in the organisms occupying the highest trophic level in the food chain in pollute water body? Explain with the help of suitable example. ... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10763

Name the greenhouse gases that contribute to total global warming. [R][Delhi Set-II, 2014] Answer: Nitrous oxide (N2O), chlorofluorocarbon (CFC), methane (CH4... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10764

State the purpose of signing the Montreal protocol. [U][ Delhi Set-II, III Compt. 2014] Answer: To control the emission of ozone depleting substances. ... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10765

Name two gases contributing the maximum to the green-house effect. [U][Delhi, Set-III Compt. 2014] Answer: Carbon dioxide (40%) and methane (20%) are the two gases which are... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10766

Where is good ozone present? Why is it called so? [U][Outside Delhi Compt. 2014] Answer: Good ozone is present in the upper part of atmosphere called stratosphere. It is cal... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10767

How does Jhum cultivation promote deforestation? [U][Outside Delhi Compt. 2011] Answer: In Jhum cultivation the farmers cut down the trees of the forest and burnt the plant ... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10768

What is a ‘green-house effect? How is this phenomenon used for growing plants especially in winter? [R][Delhi Set-II, Compt. 2016] Answer: The green-house effe... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10769

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NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10770

List four benefits on human life by eliminating the use of CFCs. [Outside Delhi-2017, Set-I, II, III] Answer:

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10771

Why are these regular reminders to reduce the use of CFCs in the production of industrial and household appliances? Explain. [U][Foreign 2017, Set-II] Answer:

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10772

How have human activities caused desertification? Explain. [A][Delhi Set-I,2013] Answer: Desertification is a type of land degradation in which relatively ... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10773

What is ozone shield any why is it important? Name the gases the cause stratospheric ozone depletion. [R][Delhi Set,2007] Answer: Ozone shield is a part of stratosphere in which the concentration of ozone... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10774

(i) ... read more