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

NCERT Exemplar Class 12 Biology Chapter 14 Ecosystem

by aglasem
June 20, 2022
in 12th Class
  • MAHE (MET) Applications 2023 - Apply Now!
  • VITEEE 2023 B-TECH Application - Apply Now!
  • LPU (Ranked #1) 2023 Application - Apply Now!
  • UPES Dehradun Applications 2023 - Apply Now!

Candidates can download NCERT Exemplar Class 12 Biology Chapter 14 from this page. The exemplar has been provided by the National Council of Educational Research & Training (NCERT) and the candidates can check it from below for free of cost. It contains objective, very short answer type, short answer type, and long answer type questions. Along with it, the answer for each question has also been provided. From the NCERT Exemplar Class 12 Biology Chapter 14, candidates can understand the level and type of questions that are asked in the exam. 

Click Here for Class 12 Biology Notes

NCERT Exemplar Class 12 Biology Chapter 14 Ecosystem

NCERT Class 12 Biology Chapter 14 is for Ecosystem. The type of questions that will be asked from NCERT Class 12 Biology Chapter 14 are displayed in the below provided NCERT Exemplar Class 12 Biology Chapter 14. With the help of it, candidates can prepare well for the examination.

Also Check: NCERT Solutions for Class 12 Biology


Multiple Choice Questions

  1. Decomposers like fungi and bacteria are:
    i. autotrophs
    ii. heterotrophs
    iii. saprotrophs
    iv. chemo-autotrophs.
    Choose the correct answer:
    (a) i and iii,
    (b) i and iv
    (c) ii and iii,
    (d) i and ii
  2. The process of mineralisation by micro organisms helps in the release of:
    a. inorganic nutrients from humus
    b. both organic and inorganic nutrients from detritus
    c. organic nutrients from humus
    d. inorganic nutrients from detritus and formation of humus.
  3. Productivity is the rate of production of biomass expressed in terms of:
    i. (kcal m–3) yr–1
    ii. g–2 yr–1
    iii. g–1 yr–1
    iv. (kcal m–2) yr–1
    (a) ii,
    (b) iii,
    (c) ii and iv,
    (d) i and iii
  4. An inverted pyramid of biomass can be found in which ecosystem?
    a. Forest
    b. Marine
    c. Grass land
    d. Tundra
  5. Which of the following is not a producer?
    a. Spirogyra
    b. Agaricus
    c. Volvox
    d. Nostoc
  6. Which of the following ecosystems is most productive in terms of net primary production?
    a. Deserts
    b. Tropical rain forests
    c. Oceans
    d. Estuaries
  7. Pyramid of numbers is:
    a. Always upright
    b. Always inverted
    c. Ether upright or inverted
    d. Neither upright nor inverted.
  8. Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?
    a. Less than 1%
    b. 2-10%
    c. 30%
    d. 50%
  9. Among the following, where do you think the process of decomposition would be the fastest?
    a. Tropical rain forest
    b. Antarctic
    c. Dry arid region
    d. Alpine region
  10. How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?
    a. 1%
    b. 10%
    c. 40%
    d. 90%
  11. During the process of ecological succession the changes that take place in communities are:
    a. Orderly and sequential
    b. Random
    c. Very quick
    d. Not influenced by the physical environment.
  12. Climax community is in a state of:
    a. non-equilibrium
    b. equilibrium
    c. disorder
    d. constant change.
  13. Among the following bio-geo-chemical cycles which one does not have losses due to respiration?
    a. Phosphorus
    b. Nitrogen
    c. Sulphur
    d. All of the above
  14. The sequence of communities of primary succession in water is:
    a. phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses and trees.
    b. phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees.
    c. free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees.
    d. phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees.
  15. The reservoir for the gaseous type of bio-geo chemical cycle exists in
    a. stratosphere
    b. atmosphere
    c. ionosphere
    d. lithosphere
  16. If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be.
    a. scavenger
    b. tertiary producer
    c. tertiary consumer
    d. secondary consumer
  17. Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100mm
    (a) Grassland
    (b) Shrubby forest
    (c) Desert
    (d) Mangrove
  18. The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called:
    a. Pelagic zone
    b. Benthic zone
    c. Lentic one
    d. Littoral zone
  19. Edaphic factor refers to:
    a. Water
    b. Soil
    c. Relative humidity
    d. Altitude
  20. Which of the following is an ecosystem service provided by a natural ecosystem?
    a. Cycling of nutrients
    b. Prevention of soil erosion
    c. Pollutant absorption and reduction of the threat of global warming
    d. All of the above

Very Short Answer Type Questions

  1. Name an organism found as secondary carnivore in an aquatic ecosystem.
  2. What does the base tier of the ecological pyramid represent?
  3. Under what conditions would a particular stage in the process of succession revert back to an earlier stage?
  4. Arrange the following as observed in vertical stratification of a forest: Grass, Shrubby plants, Teak, Amaranths.
  5. Name an omnivore which occurs in both grazing food chain and the decomposer food chain.
  6. Justify the pitcher plant as a producer.
  7. Name any two organisms which can occupy more than one trophic level in an ecosystem.
  8. In the North East region of India, during the process of jhum cultivation, forests are cleared by burning and left for regrowth after a year of cultivation. How would you explain the regrowth of forest in ecological term?
  9. Climax stage is achieved quickly in secondary succession as compared to primary succession. Why?
  10. Among bryophytes, lichens and fern which one is a pioneer species in a xeric succession?
  11. What is the ultimate source of energy for the ecosystems?
  12. Is the common edible mushroom an autotroph or a heterotroph?
  13. Why are oceans least productive?
  14. Why is the rate of assimilation of energy at the herbivore level called secondary productivity?
  15. Why are nutrient cycles in nature called biogeochemical cyles?
  16. Give any two examples of xerarch succession.
  17. Define self sustainability.
  18. Given below is a figure of an ecosystem. Answer the following questions.
    Respiration in Plants/
    i. What type of ecosystem is shown in the figure.
    ii. Name any plant that is characteristic of such ecosystem.
  19. What is common to earthworm, mushroom, soil mites and dung beetle in an ecosystem.

Short Answer Type Questions

  1. Organisms at a higher trophic level have less energy available. Comment.
  2. The number of trophic levels in an ecosystem are limited. Comment.
  3. Is an aquarium a complete ecosystem?
  4. What could be the reason for the faster rate of decomposition in the tropics?
  5. Human activities interfere with carbon cycle. List any two such activities.
  6. Flow of energy through various trophic levels in an ecosystem is unidirectional and non-cyclic. Explain.
  7. Apart from plants and animals, microbes form a permanent biotic component in an ecosystem. While plants have been referred to as autotrophs and animals as heterotrophs, what are microbes referred to as? How do the microbes fulfil their energy requirements?
  8. Poaching of tiger is a burning issue in today’s world. What implication would this activity have on the functioning of the ecosystem of which the tigers are an integral part?
  9. In relation to energy transfer in ecosystem, explain the statement “10kg of deer’s meat is equivalent to 1 kg of lion’s flesh”.
  10. Primary productivity varies from ecosystem to ecosystem. Explain?
  11. Sometimes due to biotic/abiotic factor the climax remain in a particular seral stage (pre climax) without reaching climax. Do you agree with this statement. If yes give a suitable example.
  12. What is an incomplete ecosystem? Explain with the help of suitable example.
  13. What are the shortcomings of ecological pyramids in the study of ecosystem?
  14. How do you distinguish between humification and mineralisation?
  15. Fill in the trophic levels (1, 2, 3 and 4) in the boxes provided in the figure.
    Respiration in Plants/
  16. The rate of decomposition of detritus is affected by the abiotic factors like availability of oxygen, pH of the soil substratum, temperature etc. Discuss.

Long Answer Type Questions

  1. A farmer harvests his crop and expresses his harvest in three different ways.
    a. I have harvested 10 quintals of wheat.
    b. I have harvested 10 quintals of wheat today in one acre of land.
    c. I have harvested 10 quintals of wheat in one acre of land, 6 months after sowing.
    Do the above statements mean one and the same thing. If your answer is yes, give reasons. And if your answer is ‘no’ explain the meaning of each expression.
  2. Justify the following statement in terms of ecosystem dynamics. “Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity”.
  3. Which of the following ecosystems will be more productive in terms of primary productivity? Justify your answer. A young forest, a natural old forest, a shallow polluted lake, alpine meadow.
  4. What are the three types of ecological pyramids. What information is conveyed by each pyramid with regard to structure, function and energy in the ecosystem.
  5. Write a short note on pyramid of numbers and pyramid of biomass.
  6. Given below is a list of autotrophs and heterotrophs. With your knowledge about food chain, establish various linkages between the organisms on the principle of ‘eating and being eaten’. What is this inter-linkage established known as? Algae, hydrilla, grasshopper, rat, squirrel, crow, maize plant, deer, rabbit, lizard, wolf, snake, peacock, phytoplankton, crustaceans, whale, tiger, lion, sparrow, duck, crane, cockroach, spider, toad, fish, leopard, elephant, goat, Nymphaea, Spirogyra.
  7. The energy flow in the ecosystem follows the second law of thermodynamics.” Explain.
  8. What will happen to an ecosystem if:
    a. All producers are removed;
    b. All organisms of herbivore level are eliminated; and
    c. All top carnivore population is removed
  9. Give two examples of artificial or man made ecosystems. List the salient features by which they differ from natural ecosystems.
  10. The biodiversity increases when one moves from the pioneer to the climax stage. What could be the explanation?
  11. What is a biogeochemical cycle. What is the role of the reservoir in a biogeochemical cycle. Give an example of a sedimentary cycle with reservoir located in earth’s crust.
  12. What will be the P/R ratio of a climax community and a pioneer community. What explanation could you offer for the changes seen in P/R ratio of a pioneer community and the climax community.
Click Here to download NCERT Exemplar Class 12 Biology Chapter 14 Ecosystem.
« Previous Next »

Answers to Multiple Choice Questions

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

Biology Physics Chemistry Maths

Tags: BiologyClass 12thNCERT Biology SolutionsNCERT ExemplarNCERT Exemplar Class 12NCERT Exemplar Class 12 BiologyNCERT Exemplar Problems Solutions
Previous Post

NCERT Exemplar Class 12 Biology Chapter 16 Environmental Issues

Next Post

NCERT Exemplar Class 12 Biology Chapter 11 Biotechnology: Principles and Processes

Related Posts

12th Class

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

12th Class

Tamil Nadu 12th Zoology Model Question Paper 2023 (PDF)

12th Class

Tamil Nadu 12th Tamil Model Question Paper 2023 (PDF)

12th Class

Tamil Nadu 12th Physics Model Question Paper 2023 (PDF)

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!!

  • LPU (Ranked #1) 2023 Application - Apply Now!
  • VITEEE 2023 B-TECH Application - Apply Now!
  • MAHE (MET) Applications 2023 - Apply Now!
  • UPES Dehradun Applications 2023 - 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

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

© 2019 aglasem.com

VITEEE 2023 B-Tech Application Click Here!