NEET Biology Environmental Issues MCQs Set 08

Download NEET MCQs for NEET Biology: Environmental Issues

Explore reliable objective questions for Environmental Issues tailored for NEET learners. Utilizing these Biology multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

Chapter-wise Objective Questions: Environmental Issues

Navigate directly to the 50 objective questions for Environmental Issues using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.

Multiple Choice Questions

Question 1: Domestic sewage primarily contains:
(a) Suspended solids
(b) Colloidal matter
(c) Biodegradable matter
(d) Dissolved matter
Show Answer & Explanation

Answer: (c) Biodegradable matter

Explanation:
1. Domestic sewage primarily contains biodegradable organic matter.
2. It is treated in sewage treatment plants.

Teacher's Note:
1. Biodegradable matter is decomposed by microbes.

Question 2: About highly sewage-polluted water, which is true?
(a) High DO and high BOD
(b) High DO and low BOD
(c) Low DO and low BOD
(d) Low DO and high BOD
Show Answer & Explanation

Answer: (d) Low DO and high BOD

Explanation:
1. Sewage has a lot of biodegradable organic matter which microbes decompose using oxygen.
2. So BOD is high and dissolved oxygen is low.

Teacher's Note:
1. BOD is the oxygen needed to decompose organic matter.

Question 3: Heavy metals are elements with:
(a) Density less than 5 g/cm3
(b) Density less than 5 g/cm2
(c) Density more than 5 g/cm3
(d) Density more than 5 g/cm2
Show Answer & Explanation

Answer: (c) Density more than 5 g/cm3

Explanation:
1. Heavy metals have density greater than 5 g/cm3.
2. Density is mass per unit volume, so g/cm3 is the proper unit.

Teacher's Note:
1. Examples are mercury, cadmium and lead.

Question 4: The integrated wastewater treatment plant at Arcata, supported by biologists of Humboldt State University, involves:
(a) Conventional sedimentation
(b) Filtration
(c) A series of six marshes
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. The plant uses conventional sedimentation and filtration followed by a series of six connected marshes.
2. So all are involved.

Teacher's Note:
1. Chlorine treatment is also used.

Question 5: A practical, hygienic, efficient and cost-effective solution to human waste disposal is:
(a) Ecological sanitation
(b) Open defecation
(c) Discharge of sewage into rivers
(d) Burning of waste in the open
Show Answer & Explanation

Answer: (a) Ecological sanitation

Explanation:
1. Ecological sanitation (Eco-San, composting toilets) is a sustainable system of handling human excreta.
2. It is practical, hygienic, efficient and cost-effective.

Teacher's Note:
1. Human excreta are recycled into a natural fertiliser.

Question 6: Open dumps often serve as breeding grounds for rats and flies and are not burnt to completion. They have been replaced by:
(a) Eco-san
(b) Electronic burners
(c) Sanitary landfills
(d) Solar burners
Show Answer & Explanation

Answer: (c) Sanitary landfills

Explanation:
1. Sanitary landfills have been adopted instead of open burning dumps.
2. Waste is compacted and covered with soil.

Teacher's Note:
1. Landfills have problems like leachate.

Question 7: The fine powder of recycled modified plastic developed by the company of Ahmed Khan is called:
(a) Polystyrene
(b) Polyblend
(c) Polyethylene
(d) Polyplastic
Show Answer & Explanation

Answer: (b) Polyblend

Explanation:
1. Polyblend is a fine powder of recycled modified plastic.
2. It was developed by Ahmed Khan's company in Bangalore.

Teacher's Note:
1. It is used to lay roads.

Question 8: E-wastes generated in developed countries are used by developing countries for the recovery of:
(a) Gold
(b) Nickel
(c) Copper
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. Valuable metals such as copper, iron, silicon, nickel and gold are recovered from e-waste.
2. So all are correct.

Teacher's Note:
1. Recycling in developing countries is often hazardous.

Question 9: Which is a cyclical, zero-waste procedure where waste products from one process are cycled as nutrients for other processes?
(a) Integrated organic farming
(b) Integrated remedy for plastic waste
(c) Integrated wastewater treatment
(d) Sustainable waste treatment
Show Answer & Explanation

Answer: (a) Integrated organic farming

Explanation:
1. Integrated organic farming is a cyclical, zero-waste procedure.
2. Waste from one process is the nutrient for another.

Teacher's Note:
1. Ramesh Chandra Dagar implemented it.

Question 10: The unique idea of integrated organic farming was executed by:
(a) Ramesh Chandra Dagar
(b) Ahmed Khan
(c) Amrita Devi
(d) Sunderlal Bahuguna
Show Answer & Explanation

Answer: (a) Ramesh Chandra Dagar

Explanation:
1. Ramesh Chandra Dagar, a farmer from Sonepat, Haryana, practised integrated organic farming.
2. Amrita Devi is associated with the Bishnoi movement.

Teacher's Note:
1. Bahuguna led the Chipko movement.

Question 11: Which is NOT a control measure for the greenhouse effect?
(a) Cutting down the use of fossil fuels
(b) Improving efficiency of energy usage
(c) Increasing deforestation
(d) Slowing down human population growth
Show Answer & Explanation

Answer: (c) Increasing deforestation

Explanation:
1. Reducing fossil fuels, improving energy efficiency, reducing deforestation and slowing population growth control global warming.
2. Increasing deforestation raises CO2, so it is not a control measure.

Teacher's Note:
1. Planting trees helps.

Question 12: The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of:
(a) Decibel
(b) Dobson unit
(c) Debye
(d) Dalton
Show Answer & Explanation

Answer: (b) Dobson unit

Explanation:
1. Total ozone is measured in Dobson units (DU).
2. One DU is 0.01 mm of pure ozone at standard temperature and pressure.

Teacher's Note:
1. Decibel measures sound.

Question 13: Cl atoms released from CFCs degrade ozone in which layer of the atmosphere?
(a) Troposphere
(b) Stratosphere
(c) Ionosphere
(d) Thermosphere
Show Answer & Explanation

Answer: (b) Stratosphere

Explanation:
1. Ozone is mostly in the stratosphere.
2. UV acts on CFCs there and releases chlorine atoms which degrade ozone.

Teacher's Note:
1. The stratosphere has the ozone layer.

Question 14: Which is NOT an effect of UV-B on human health?
(a) Ageing of the skin
(b) Inflammation of the cornea
(c) Cancer of the skin
(d) Depigmentation of the retina
Show Answer & Explanation

Answer: (d) Depigmentation of the retina

Explanation:
1. UV-B damages DNA, causes ageing of skin and skin cancers.
2. The cornea can get inflamed (snow blindness) but retinal depigmentation is not mentioned as an effect.

Teacher's Note:
1. The ozone layer protects against UV-B.

Question 15: The Montreal Protocol came into effect in:
(a) 1987
(b) 1988
(c) 1989
(d) 1992
Show Answer & Explanation

Answer: (c) 1989

Explanation:
1. The Montreal Protocol was signed in 1987 and came into effect in 1989.
2. It controls emission of ozone-depleting substances.

Teacher's Note:
1. It was later strengthened by amendments.

Question 16: The ozone hole over Antarctica develops each year between:
(a) Late August and early October
(b) Early August and late October
(c) Early October and early December
(d) Late October and late December
Show Answer & Explanation

Answer: (a) Late August and early October

Explanation:
1. The Antarctic ozone hole forms between late August and early October.
2. Ozone depletion is in the spring there.

Teacher's Note:
1. Polar stratospheric clouds help.

Question 17: Which is NOT a result of waterlogging?
(a) Deposition of a salt crust on land
(b) Collection of salts around the roots
(c) Damage to agriculture
(d) Leaching of salts
Show Answer & Explanation

Answer: (d) Leaching of salts

Explanation:
1. Waterlogging draws salts to the surface, leaving a salt crust around the roots and damaging crops.
2. Leaching of salts is not a result of waterlogging.

Teacher's Note:
1. Irrigation problems include salinisation.

Question 18: According to the National Forest Policy (1988) of India, 33 percent forest cover is recommended for the plains and ........ for the hills.
(a) 30 percent
(b) 19.4 percent
(c) 67 percent
(d) 76 percent
Show Answer & Explanation

Answer: (c) 67 percent

Explanation:
1. The National Forest Policy 1988 recommends 33 percent area under forests overall, with 67 percent for hills.
2. The plains figure is 33 percent.

Teacher's Note:
1. Forests prevent soil erosion.

Question 19: Slash and burn agriculture is associated with:
(a) Deforestation
(b) Jhum cultivation
(c) Shifting cultivation
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. Slash and burn agriculture is called jhum cultivation in north-eastern India.
2. It is a form of shifting cultivation that leads to deforestation.

Teacher's Note:
1. Forests are cut and burnt for cropping.

Question 20: Realising the significance of participation by local communities, the Government of India in the 1980s introduced the concept of:
(a) Integrated Forest Management
(b) Joint Forest Management
(c) National Forest Policy
(d) Chipko movement
Show Answer & Explanation

Answer: (b) Joint Forest Management

Explanation:
1. Joint Forest Management (JFM) involves local communities in protecting forests.
2. In return they get forest products.

Teacher's Note:
1. Chipko was a movement in the 1970s.

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Practice MCQs for NEET Biology Environmental Issues

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FAQs

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