• AglaSem
  • Schools
  • Admission
  • Career
  • News
  • Hindi
  • Mock Test
  • Docs
  • ATSE
aglasem
No Result
View All Result
aglasem
  • CBSE
    • Date Sheet
    • Syllabus
    • Sample Papers
    • Question Papers
  • ICSE / ISC
  • State Boards
    • Date Sheet
    • Admit Card
    • Result
    • Sample Paper
    • Question Paper
  • NCERT
    • NCERT Books
    • NCERT Solutions
    • NCERT Exempler
    • Teaching Material
  • Mock Tests
  • Study Material
    • Notes
    • Solved Sample Papers
    • Maps
    • Writing Skill Format
  • Olympiads
    • ATSE
    • KVPY
    • NTSE
    • NMMS
  • School Admission
  • Entrance Exams
    • JEE Main
    • NEET
    • CLAT
  • Students Guide
    • Careers Opportunities
    • Courses & Career
    • Courses after 12th
  • Others
    • RD Sharma Solutions
    • HC Verma Solutions
    • Teaching Material
    • Classes Wise Resources
    • Videos
No Result
View All Result
aglasem
No Result
View All Result

Class 12 Important Questions for Biology – Environmental Issues (NCERT Exemplar)

by Neepur Garg
January 21, 2023
in 12th Class
  • BML Munjal Univ 2023 Application - Apply Now!
  • Plaksha University B-TECH Application - Apply Now!

Class 12 Important Questions for Biology – Environmental Issues

NCERT Exemplar Class 12 Biology is very important resource for students preparing for XII Board Examination. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 12.

Question from very important topics are covered by NCERT Exemplar Class 12. You also get idea about the type of questions and method to answer in your class 12th examination.

Click Here for Class 12 Biology Notes

Here you can get Class 12 Important Questions Biology based on NCERT Text book for Class XII. Biology Class 12 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Environmental Issues for Class 12 Biology subject.

Biology Important Questions Class 12 are given below.

Multiple Choice Questions

  1. Non-biodegradable pollutants are created by:
    • a. nature
    • b. excessive use of resources
    • c. humans
    • d. natural disasters
  2. According to the Central Pollution Control Board, particles that are responsible for causing great harm to human health are of diameter:
    • a. 2.50 micrometers
    • b. 5.00 micrometers
    • c. 10.00 micrometers
    • d. 7.5 micrometers
  3. The material generally used for sound proofing of rooms like a recording studio and auditorium, etc. is:
    • a. cotton
    • b. coir
    • c. wood
    • d. styro foam
  4. Compressed Natural Gas (CNG) is:
    • a. propane
    • b. methane
    • c. ethane
    • d. butane
  5. World’s most problematic aquatic weed is:
    • a. Azolla
    • b. Wolffia
    • c. Eichornia
    • d. Trapa
  6. Which of the following causes biomagnification?
    • a. SO2
    • b. Mercury
    • c. DDT
    • d. Both b & c
  7. The expanded form of DDT is:
    • a. dichloro diphenyl trichloroethane
    • b. dichloro diethyl trichloroethane
    • c. dichloro dipyrydyl trichloroethane
    • d. dichloro diphenyl tetrachloroacetate
  8. Which of the following material takes the longest time for biodegradation?
    • a. Cotton
    • b. Paper
    • c. Bone
    • d. Jute
  9. Choose the incorrect statement.
    • a. The Montreal protocol is associated with the control of emission of ozone depleting substances
    • b. Methane and carbon dioxide are green house gases
    • c. Dobson units are used to measure oxygen content
    • d. Use of incinerators is crucial to disposal of hospital wastes
  10. Among the following which one causes more indoor chemical pollution?
    • a. burning coal
    • b. burning cooking gas
    • c. burning mosquito coil
    • d. room spray
  11. The green scum seen in the fresh water bodies is:
    • a. blue green algae
    • b. red algae
    • c. green algae
    • d. both (a) and (c)
  12. The loudness of a sound that a person can withstand without discomfort is about
    • a. 150 dB.
    • b. 215 dB.
    • c. 30 dB.
    • d. 80 dB.
  13. The major source of noise pollution, world wide is due to:
    • a. office equipment
    • b. transport system
    • c. sugar, textile and paper industries
    • d. oil refineries and thermal power plants.
  14. Match correctly the following and choose the correct option
    i. Environment Protection Act A. 1974
    ii. Air Prevention & Control of Pollution Act B. 1987
    iii. Water Act C. 1986
    iv. Amendment of Air Act to include noise D. 1981

    The correct matches is;

    • a. i-C, ii-D, iii-A, iv-B
    • b. i-A, ii-C, iii-B, iv-D
    • c. i-D, ii-A, iii-B, iv-C
    • d. I-C, ii-D, iii-B, iv-A
  15. Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into:
    • a. carbon dioxide and water
    • b. carbon mono oxide
    • c. methane
    • d. carbon dioxide and methane
  16. Why is it necessary to remove sulphur from petroleum products?
    • a. To reduce the emission of sulphur dioxide in exhaust fumes
    • b. To increase efficiency of automobiles engines
    • c. To use sulphur removed from petroleum for commercial purposes
    • d. To increase the life span of engine silencers
  17. Which one of the following impurities is easiest to remove from wastewater?
    • a. Bacteria
    • b. Colloids
    • c. Dissolved solids
    • d. Suspended solids
  18. Which one of the following diseases is not due to contamination of water?
    • a. Hepatitis-B
    • b. Jaundice
    • c. Cholera
    • d. Typhoid
  19. Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentrations of:
    • a. carbon
    • b. sulphur
    • c. calcium
    • d. phosphorus
  20. 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.
  21. Match the items in column I and 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

    The correct match is:

    • 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 i
  22. In the textbook you came across Three Mile Island and Chernobyl disasters associated with accidental leakage of radioactive wastes. In India we had Bhopal gas tragedy. It is associated with which of the following?
    • a. CO2
    • b. Methyl Iso-Cyanate
    • c. CFC’s
    • d. Methy Cyanate

Very Short Answer Type Questions

  1. Use of lead-free petrol or diesel is recommended to reduce the pollutants emitted by automobiles. What role does lead play?
  2. In which year was the Air (Prevention and Control of Pollution) Act amended to include noise as air pollution.
  3. Name the city in our country where the entire public road transport runs on CNG.
  4. It is a common practice to undertake desilting of the overhead water tanks. What is the possible source of silt that gets deposited in the water tanks?
  5. What is cultural eutrophication?
  6. List any two adverse effects of particulate matter on human health.
  7. What is the raw material for polyblend?
  8. Blends of polyblend and bitumen, when used, help to increase road life by a factor of three. What is the reason?
  9. Mention any two examples of plants used as wind breakers in the agricultural fields.
  10. Name an industry which can cause both air and thermal pollution and as well as eutrophication.
  11. What is an algal bloom?
  12. What do you understand by biomagnification?
  13. What are the three major kinds of impurities in domestic wastewater?
  14. What is reforestation?
  15. What is the best solution for the treatment of electronic wastes?

Short Answer Type Questions

  1. Is it true that carpets and curtains/drapes placed on the floor or wall surfaces can reduce noise level. Explain briefly?
  2. What is hybrid vehicle technology?. Explain its advantages with a suitable example?
  3. Is it true that if the dissolved oxygen level drops to zero, the water will become septic. Give an example which could lower the dissolved oxygen content of an aquatic body.
  4. Name any one green house gas and its possible source of production on a large scale. What are the harmful effects of it?
  5. It is a common practice to plant trees and shrubs near the boundary walls of buildings. What purpose do they serve?
  6. Why has the National Forest Commission of India recommended a relatively larger forest cover for hills than for plains?
  7. How can slash and burn agriculture become environment friendly?
  8. What is the main idea behind “Joint Forest Management Concept” introduced by the Government of India?
  9. What do you understand by Snow-blindness?
  10. How has DDT caused decline in bird population?
  11. Observe the figure A and B given below and answer the following questions
    Environmental Issues
    i. The power generation by the above two methods is non-polluting  True/False.
    ii. List any two applications of solar energy
    iii. What is a photovoltaic cell?

Long Answer Type Questions

  1. Write a short note on electronic waste. List the various sources of e- wastes and the problems associated with its disposal.
  2. What is organic farming? Discuss the benefits of organic farming as a viable practise in the context of developing nations like India.
  3. Water logging and soil salinity are some of the problems that have come in the wake of the Green Revolution. Discuss their causes and adverse effects to the environment.
  4. What are multipurpose trees? Give the botanical and local names of any two multipurpose trees known to you and list their uses.
  5. What are the basic characteristics of a modern landfill site. List any three and also mention the reasons for their use.
    Ans. Characteristics of a modern landfill include:

    • i. methods to contain leachate such as lining clay or plastic liners.
    • ii. compaction and covering of the waste to prevent it from being blown by wind.
    • iii. installation of a landfill gas extraction system to extract the gas for use in generation of power.
  6. How does an electrostatic precipitator work?
  7. Observe figure and answer the following questions.
    Environmental Issues
    i. What ecological term is used to describe the DDT accumulation at different trophic levels?
    ii. List any one effect of DDT accumulation on birds
    iii. Will DDT accumulation lead to eutrophication?
    iv. Does it affect the BOD?
    v. Name disease caused by accumulation of any heavy metal.
« Previous

Answers to Multiple Choice Questions

1-c 2-a 3-d 4-b 5-c 6-d
7-a 8-c 9-c 10-c 11-d 12-d
13-b 14-a 15-a 16-a 17-d 18-a
19-d 20-a 21-c 22-b

Go Back to Biology Home Page Physics Chemistry Maths

To get fastest exam alerts and government job alerts in India, join our Telegram channel.

Tags: CBSE Important Questions for Class 12Class 12 BiologyClass 12thNCERT Exemplar Class 12NCERT Exemplar Class 12 BiologyNCERT Exemplar Problems Class 12NCERT Exemplar Problems Solutions
Previous Post

Class 11 Important Questions for Physics – NCERT Exemplar

Next Post

Class 12 Important Questions for Biology – Biodiversity and Conservation (NCERT Exemplar)

Related Posts

12th Class

Tamil Nadu 12th Model Question Paper 2023 (PDF) – DGE TN Sample Paper for Class 12

12th Class

Tamil Nadu 12th Model Question Paper for Accountancy

12th Class

Tamil Nadu 12th Model Question Paper for Bio Botany

12th Class

Tamil Nadu 12th Model Question Paper for Bio Chemistry

Leave a Reply Cancel reply

CBSE Board Quick Links

  • CBSE Date Sheet
  • CBSE Result
  • CBSE Syllabus
  • CBSE Sample Papers
  • CBSE Question Papers
  • CBSE Notes
  • CBSE Practice Papers
  • CBSE Mock Tests

Class Wise Study Material

  • Class 1
  • Class 2
  • Class 3
  • Class 4
  • Class 5
  • Class 6
  • Class 7
  • Class 8
  • Class 9
  • Class 10
  • Class 11
  • Class 12

Registration Open!!

  • BML Munjal Univ 2023 Application - Apply Now!
  • Plaksha University B-TECH Application - Apply Now!

Board Exams 2023

  • Solved Sample Papers
  • Maps
  • Revision Notes
  • CBSE
  • State Board

Study Material

  • Class Notes
  • NCERT Solutions
  • NCERT Books
  • HC Verma Solutions
  • Courses After Class 12th

Exam Zone

  • JEE Main 2023
  • NEET 2023
  • CLAT 2023
  • Fashion & Design
  • Latest
  • Disclaimer
  • Terms of Use
  • Privacy Policy
  • Contact

© 2019 aglasem.com

  • CBSE
    • Date Sheet
    • Syllabus
    • Sample Papers
    • Question Papers
  • ICSE / ISC
  • State Boards
    • Date Sheet
    • Admit Card
    • Result
    • Sample Paper
    • Question Paper
  • NCERT
    • NCERT Books
    • NCERT Solutions
    • NCERT Exempler
    • Teaching Material
  • Mock Tests
  • Study Material
    • Notes
    • Solved Sample Papers
    • Maps
    • Writing Skill Format
  • Olympiads
    • ATSE
    • KVPY
    • NTSE
    • NMMS
  • School Admission
  • Entrance Exams
    • JEE Main
    • NEET
    • CLAT
  • Students Guide
    • Careers Opportunities
    • Courses & Career
    • Courses after 12th
  • Others
    • RD Sharma Solutions
    • HC Verma Solutions
    • Teaching Material
    • Classes Wise Resources
    • Videos

© 2019 aglasem.com

Download Sample Paper 2023 Package Apply Now!!