Worksheets Class 12 Biology Environmental Issues

Students should refer to Worksheets Class 12 Biology Environmental Issues Chapter 16 provided below with important questions and answers. These important questions with solutions for Chapter 16 Environmental Issues have been prepared by expert teachers for Class 12 Biology based on the expected pattern of questions in the class 12 exams. We have provided Worksheets for Class 12 Biology for all chapters on our website. You should carefully learn all the important examinations questions provided below as they will help you to get better marks in your class tests and exams.

Environmental Issues Worksheets Class 12 Biology

Objective Questions

Question. The goal of Euro-IV norms, according to roadmap is to reduce sulphur to –
(a) 50 ppm in petrol and diesel
(b) 150 ppm in petrol and diesel
(c) 350 ppm in petrol and diesel
(d) 250 ppm in petrol and diesel

Question. Slash and Burn agriculture are associated with –
(a) Deforestration
(b) Jhum cultivation
(c) Shifting cultivation
(d) All the above

Question. Regarding to composition of waste water which among the following is not true –
(a) Suspended solid – sand, silt & clay
(b) Colloidal matter – faecal matter, bacteria & cloth
(c) Dissolved material – nitrate, ammonia & phosphate
(d) Dissolved material – faecal matter, bacteria & nutrients

Question. Pollutants from man’s activities like effluents from industries and homes can radically accelerate the aging of lake, that is known as –
(a) Cultural Eutrophication
(b) Accelerated Eutrophication
(c) Rising Eutrophication
(d) Both (a) & (b)

Question. Integrated waste water treatment plant of town of Arcata is supported by biologists of Humboldt state university, involves –
(a) Conventional sedimentation
(b) Filteration
(c) Series of six marshes
(d) All the above

Question. What is the main problem with switching over to CNG from petrol and diesel ?
(a) High cost
(b) Difficulty of lying down pipelines to deliver CNG for uninterrupted supply
(c) Lack of suitable engines
(d) All the above

Question. Beside use of CNG, simultaneously parallel steps taken in Delhi for reducing vehicular pollution,except-
(a) Use of unleaded petrol
(b) Use of low sulphur petrol and diesel
(c) Use of catalytic convertors
(d) Use of Electrostatic precipitators

Question. Series of six connected marshes over 60 hectares of marshland, with appropriate plants, algae, fungi and bacteria is responsible for –
(a) Neutrilisation of pollutants
(b) Absorbtion of pollutants
(c) Assimillation of pollutants
(d) All the above

Question. Practical ,hygienic efficient and cost effective solution to human waste disposal is –
(a) Eco – San toilets
(b) Natural toilets
(c) Ecofriendly toilets
(d) Ecological sanitation

Question. Open dumps often serve as breeding ground for rats and flies and not burnt to completion. Which among the following were adopted as the substitute for open burning dumps –
(a) Eco san
(b) Electronic Burners
(c) Sanitary Landfills
(d) Solar Burners

Question. Which among the following was developed by company of Ahmed Khan by a fine powder of recycled modified plastic –
(a) Polysterene
(b) Polyblend
(c) Polyethylene
(d) Polyplastic

Question. Which among the following is a cyclical, zero waste procedure, where waste products from one process are cycled in as nutrients for other processes-
(a) Integrated organic farming
(b) Integrated remedy for plastic waste
(c) Integrated waste water treatment
(d) Sustainable waste treatment

Question. Scrubber is one of the device used to remove air pollutants. Which of the following gaseous pollutant can be remove through it –
(a) NOx
(b) SO₂
(c) CO
(d) CO₂

Question. The Bharat Stage-III norms of Automobiles are applicable throughout the country from –
(a) 1 October 2005
(b) 1 October 2010
(c) 1 October 2009
(d) 1 October 2012

Question. All automobiles and fuel petrol and diesel – were to have met the Euro-IV emission specification in 13 highly polluted cities of India from –
(a) 1 April 2002
(b) 1 April 2005
(c) 1 April 2010
(d) 1 April 2012

Question. Unlike domestic sewage, waste water from industries like petroleum, paper manufacturing, metal extractions and processing etc. are often important source of water pollution. Out of these heavy metals are –
(a) Elements with density < 5 g/cm³
(b) Elements with density < 5 g/cm²
(c) Elements with density > 5g /cm³
(d) Elements with density > 5g/ cm²

Question. Biomagnification – an increase in concentration of toxic substances at successive trophic levels, is well known for –
(a) DDT
(b) Mercury
(c) CO
(d) Both (a) and (b)

Question. According to CPCB particulate size £ 2.5 micrometer are responsible for cousing greatest harm to human health. They can cause various harms except –
(a) Breathing and Respiratory symptoms
(b) Respiratory Irritation
(c) Inflammation and damage to lungs
(d) Lack of sleep

Question. The unique idea of integrated organic farming was executed by-
(a) Ramesh Chandra Dagar
(b) Ahmed Khan
(c) Amrita Devi
(d) Sunderlal Bahuguna

Question. Green house effect leads to deleterious changes in the environment and resulting in odd climatic changes. Which among the following is not the control measure of it –
(a) Cutting down the use of fossil fuel
(b) Improving efficiency of energy usage
(c) Increasing deforestration
(d) Slowing down the human population

Question. The thickness of the ozone in a column of air from ground to top of the atmosphere is measured in terms of –
(a) Decibel
(b) Dobson
(c) Deby
(d) Dalton

Question. Harmful effects of air polluntants depends on –
(a) Concentration of pollutants
(b) Duration of exposure
(c) Organism
(d) All the above 

Question. In India, the Air (prevention and control of pollution) act, came in to force in –
(a) 1972
(b) 1981
(c) 1987
(d) 1992

Question. Cl atoms released from CFC show degradation of ozone in which layer of atmoshpere –
(a) Trophosphere
(b) Stratosphere
(c) Ionosphere
(d) Thermosphere

Question. Which among the following is not the influence of UV-B on human health –
(a) Aging of skin
(b) Inflammation of cornea
(c) Cancer of skin
(d) Depigmentation

Question. Realising the significance of participation by local communities, the goverment of India in 1980s has introduced the concept of –
(a) Integrated Forest Management [IFM]
(b) Joint forest management [JFM]
(c) National Forest Policy
(d) Chipko movement

Question. To improve the quality of environment (air, water and soil) the Govt. of India passed the ‘Environment (Protection) Act’ in year
(a) 1981
(b) 1986
(c) 1987
(d) 1974

Question. The scrubber is used mainly to remove which of the following gas/es from the exhaust after spraying water/ lime ?
(a) CO₂
(b) SO₂
(c) O₂ and N₂
(d) CO and CO₂

Question. Which of the two expensive metals are used as catalysts by catalytic converters and are fitted into automobiles for reducing emission of poisonous gases ?
(a) Platinum – palladium, rhodium
(b) Cadmium, rhodium
(c) Copper, cadmium
(d) Lead, mercury

Question. Euro II norms stipulate that sulphur be controlled at _______ ppm in diesel and _______ ppm in petrol.
(a) 350; 150
(b) 150; 350
(c) 350; 250
(d) 150; 250

Question. Which of the following minimum percentage of impurities by domestic sewage make the water unfit for human use ?
(a) 1
(b) 5
(c) 0.1
(d) 0.5

Question. Full form of B.O.D. is
(a) Biological organism death
(b) Biotic oxygen demand
(c) Biochemical oxygen demand
(d) Biological organisation day

Question. Presence of large amount of nutrients in water also cause excess growth of planktonic (free-floating) algae, called ___________.
(a) biomagnification
(b) eutrophication
(c) algal bloom
(d) biofortification

Statement Type Questions

Question. Read the following statements.
A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this;
(i) Lots of urea and phosphate fertilizer were used in the crops in the vicinity.
(ii) The area was sprayed with DDT by an aircraft.
(iii) The lake water turned green and stinky.
(iv) Phytoplankton populations in the lake declined intially thereby greatly reducing photosynthesis.
Which two of the above were the main causes of fish mortality in the lake ?
(a) (i) and (iii)
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (iii) and (iv)

Question. Which of the following statements about eutrophication are ?
(i) It can be a naturally occurring process.
(ii) It is commonly found in standing rather than running water.
(iii) It can lead to oxygen depletion.
(iv) It is commonly associated with high levels of phosphates and nitrates.
(a) (iii) and (iv)
(b) (i), (ii) and (iii)
(c) (ii), (iii) and (iv)
(d) all of these

Question. Which of the following is the correct statement ?
(a) Cultural eutrophication is an accelerated form of eutrophication.
(b) In the presence of prime contaminants, such as nitrates and phosphates, the growth of algae is arrested.
(c) The water from electricity generating units enhances the growth of indigenous fauna and flora.
(d) All of the above

Question. Mark the correct statement.
(a) The ozone of stratosphere is good ozone.
(b) Troposphere, on top of stratosphere, is away from earth surface.
(c) The thickness of ozone is measured in dB.
(d) The wavelength of UV- B is more than that of UV- A.

Question. After the conventional sedimentation, filtering and chlorine, lots of dangerous pollutants still remain. To combat this, the biologists developed a series of six connected marshes where appropriate plants, algae, fungi and bacteria were seeded into this area, which
(i) Neutralize the pollutants
(ii) Absorb the pollutants
(iii) Assimilate the pollutants
(a) All of these
(b) None of these
(c) only (i) and (iii)
(d) only (i) and (ii)

Question. Which of the following is/are correct regarding Montreal Protocol?
(i) Persistent organic pollutants.
(ii) Global warming and climate change.
(iii) To control the emission of ozone depleting substances.
(iv) Biosafety of genetically modified organisms.
(a) (i) and (iii)
(b) (iii) only
(c) (iii) and (iv)
(d) (i) and (iii)

Question. Which of the following would be most likely to help to slow down the greenhouse effect?
(a) Ensuring that all excess paper packaging is burned to ashes.
(b) Promoting the use of private rather than public transport.
(c) Converting tropical forests into grazing land for cattle.
(d) Re-designing land-fill dumps to allow methane to be collected.

Assertion/Reason Type Questions

In the following questions, a statement of Assertion is followed by a statement of Reason.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

Question. Assertion : A suspended particulate matter (SPM) is an important pollutant released by diesel vehicles.
Reason : Catalytic converters greatly reduce pollution caused by automobiles.

Question. Assertion : Water pollutants are measured by BOD.
Reason : If BOD is more, the water is polluted.

Critical Thinking Type Questions

Question. CNG is better than petrol/ diesel, since
(a) CNG burns more efficiently.
(b) CNG burns completely.
(c) CNG cannot be adulterated.
(d) All of the above

Question. Water pollution can be stopped best by
(a) treating effluents to remove injurious chemicals.
(b) rearing more fishes.
(c) cultivating useful water plants.
(d) spraying with DDT.

Question. A lake affected by high levels of artificial eutrophication will have
(a) high nutrient levels, large phytoplankton populations, and low oxygen levels at depth.
(b) high levels of nutrients, low phytoplankton levels, high oxygen levels in surface waters.
(c) low nutrient levels, large phytoplankton populations, and low oxygen levels at depth.
(d) low nutrient levels, low phytoplankton populations, and high oxygen levels at depth.

Question. Today the concentration of green house gases is very high because of
(a) use of refrigerator.
(b) increased combustion of oils and coal.
(b) deforestation.
(d) all of the above

Question. If the forest cover is reduced to half, what is most likely to happen on a long term basis?
(a) Tribals living in these areas will starve to death.
(b) Cattle in these and adjoining areas will die due to lack of fodder.
(c) Large areas will become deserts.
(d) Crop breeding programmes will suffer due to a reduced availability of variety of germplasm.

Question. Motor vehicles equipped with catalytic converter are advised to use unleaded petrol because
(a) lead causes inactivation of catalyst.
(b) lead reduces the emission of poisonous gases.
(c) lead is a heavy metal.
(d) lead decreases the efficiency of vehicle.

Question. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. This happens because
(a) a toxic substance accumulated by an organism can not be metabolized.
(b) a toxic substance accumulated by an organism can not be excreted.
(c) a toxic substance is passed on to the next trophic level.
(d) All of the above

Question. Which one of the following statement pertaining to pollutants is correct?
(a) DDT is a non-biodegradable pollutant.
(b) Excess fluoride in drinking water causes osteoporosis, hardening of bones, stiff joints.
(c) Excess cadmium in drinking water causes black foot disease.
(d) Methylmercury in water may cause “Itai Itai” disease.

Question. Which of the following is not an environmental problem?
(a) Soil erosion
(b) Water logging
(c) Desertification
(d) Reforestation

Question. As a result of global warming, the sea level will
(a) increase
(b) decrease
(c) remain the same
(d) none of these

Question. Drawback of DDT as pesticide is that
(a) it becomes ineffective after sometime.
(b) it is less effective than others.
(c) it is not easily/rapidly degraded in nature.
(d) its high cost.

Question. Climate of the world is threatened by
(a) increasing concentration of atmospheric oxygen.
(b) decreasing amount of atmospheric oxygen.
(c) increasing amount of atmospheric carbondioxide.
(d) decreasing amount of atmospheric carbondioxide.

Question. Algal blooms impart a distinct colour to water due to
(a) their pigments.
(b) excretion of coloured substances.
(c) formation of coloured chemicals in water facilitated by physiological degradation of algae.
(d) absorption of light by algal cell wall.

Question. Vast tracts of rainforest have been clear-cut and burned.
This practice has increased atmospheric carbon dioxide levels significantly because
(a) forest provided a place for the carbon dioxide to be used.
(b) burning of the forest released a large amount of carbon dioxide into the atmosphere.
(c) grasslands that replaced the forests can’t utilize as much carbon dioxide.
(d) all of the above

Question. Soil fertility can be destroyed by
(a) cutting down forests
(b) acid rain
(c) overgrazing and over-irrigation
(d) all of the above

Question. Nuclear power stations even with adequate radiation safety measures generate
(a) thermal pollution of water bodies.
(b) thermal pollution of soil.
(c) noise polllution.
(d) all of the above

Matching Type Questions

Question. Match column-I with column-II and choose the correct option.

Column-I	Column-II
A. DDT	I. CH4, CO2
B. Platinum- palladium and Rhodium	II. SO2
C. Acid rain	III. Biological magnification
D. Global warming	IV. Catalytic converter

(a) A – IV; B – III; C – II; D – I
(b) A – I; B – III; C – II; D – IV
(c) A – II; B – III; C – IV; D – I
(d) A – III; B – IV; C – II; D – I

Question. Match column-I with column-II and select the correct option.

Column-I	Column-II
A. Environment (Protection) Act	I. 1987
B. Air (Prevention and Control of Pollution) Act	II. 1986
C. Water (Prevention and Control of Pollution) Act	III. 1980
D. Concept of Joint Forest Management of Govt. of India	IV. 1974

(a) A – IV; B – III; C – II; D – I
(b) A – II; B – I; C – IV; D – III
(c) A – I; B – II; C – III; D – IV
(d) A – I; B – III; C – II; D – IV

Question. Match column-I with column-II and select the correct option.

Column-I	Column-II
A. Ahmed Khan	I. Spreading information and help on the practice of integrated organic farming
B. Ramesh Chandra Dagar	II. Protecting wildlife
C. Amrita Devi Bishnoi	III. A plastic sack manufacturer of Bangalore developed polyblend

(a) A – III; B – I; C – I
(b) A – II; B – I; C – I
(c) A – I; B – II; C – II
(d) A – III; B – II; C – II

Question. Match the items of column-I with column-II and choose the correct option.

Column-I	Column-II
A. UV	I. Biomagnification
B. Biodegradable organic matter	II. Eutrophication
C. DDT	III. Snow blindness
D. Phosphates	IV. BOD

(a) A – II, B – I, C – IV, D – III
(b) A – III, B – II, C – IV, D – I
(c) A – III, B – IV, C – I, D – II
(d) A – III, B – I, C – IV, D – II

Diagram Type Questions

Question. According to size of air pollutants, range and types of chemical the device given below is best used to control which of the following pollutants?

(a) Large particulates
(b) Charged particulate matter
(c) Dissolved gases
(d) Fine particles

Question. The given graph shows the effect of sewage discharge on some important characteristics of a river. Which of the following is the correct label for A, B and C ?

(a) (A) Dissolved oxygen, (B) Point of sewage discharge, (C) BOD
(b) (A) BOD, (B) Point of treated water discharge, (C) Dissolved oxygen
(c) (A) Dissolved oxygen, (B) Point of treated water discharge, (C) BOD 
(d) (A) BOD, (B) Point of sewage discharge, (C) Dissolved oxygen

Question. The given diagram shows electrostatic precipitator. Identify A, B and C.

(a) A – Discharge corona, B – Negatively charged wire, C – Collection plate grounded
(b) A – Discharge corona, B – Positively charged wire, C – Collection plate grounded
(c) A – Discharge corona, B – Negatively charged wire, C – Collection plate burnt
(d) A – Uncharge corona, B – Positively charged wire, C – Collection plate never grounded

Question. Which of the following phenomenon is represented by the given figure?

(a) Green house effect
(b) El Nino effect
(c) Ozone hole
(d) Eutrophication