CBSE Class 12 Biology NCERT Exemplar Solutions: Chapter 14, Ecosystem

Get the precise and detailed solutions to the NCERT Exemplar problems for Class 12 Biology chapter 14, Ecosystem in PDF format. All the solutions are designed in a way to give you a clear understanding of the concepts used.

Created On: Sep 6, 2018 11:13 IST
NCERT Exemplar Solutions: Ecosystem
NCERT Exemplar Solutions: Ecosystem

To help students access the accurate solutions to all NCERT Exemplar problems of class 12 Biology, our experts have solved all the questions in detail but simple language.

Here we are providing the NCERT Exemplar solutions for CBSE Class 12 Biology chapter 14, Ecosystem. All these solutions have been prepared by the subject experts and have been revised to bring the accurate study material for our students. These solutions have been collated in the form of PDF which students can download for free of cost and refer the same when required.

 Few problems along with their solutions from this chapter are given follows:

Q. An inverted pyramid of biomass can be found in which ecosystem?

(a) Forest            (b) Marine          (c) Grass land     (d) Tundra

Ans. (b) Marine               

In case of aquatic ecosystem like pond ecosystem, marine ecosystem, pyramid of biomass is inverted because the biomass of fishes exceeds than that of phytoplanktons which make the small standing crop of aquatic ecosystems.

In aquatic ecosystem biomass of trophic level depends upon reproductive potential and longevity of its members

Q. Primary productivity varies from ecosystem to ecosystem. Explain?

Ans. Primary productivity is the rate at which primary producers (plants) capture and store solar radiation to form chemical energy. Primary production depends upon producers (green plant) which are variable in different ecosystems. So, primary productivity varies from ecosystem to ecosystem.

Q. How do you distinguish between humification and mineralisation?

Ans. Humification is the process of decomposition of soil that leads to accumulation of a dark-coloured amorphous substance called humus. Humus is highly resistant to microbial action and under goes dicomposition at a very slow rate.

Mineralisation is the process by which the humus is further degraded by microbes and inorganic nutrients or minerals are released back into the substratum.

Q. 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?

Ans. (a) Removal of all producers reduces primary production in the ecosystem. Hence, no biomass will be available to the successive/higher trophic level or heterotrophic organisms.

(b) Elimination of all organisms of herbivore level results into an increase in primary productivity and biomass of producer and carnivorous animal will not survive due to unavailability of food herbivores.

(c)  Removal of top carnivores also disturb the ecosystem as it will result in huge increase in number of herbivores which will finish plants (producers) creating desertification.

Find below the links to download Class 12 Biology NCERT Exemplar Solutions for chapter 14- Ecosystem:


Link to Download PDF

Multiple Choice Questions


Very Short answer type questions


Short answer type questions


Long answer types questions


CBSE Class 12 Biology Syllabus 2018 - 2019

Class 12 Biology NCERT Exemplar Problems:

The NCERT Exemplar problems are considered to be the most applicative kind of problems which help to enhance a student’s critical thinking and problem solving ability. These problems form the best practice source to prepare effectively for board exams and the medical entrance tests. So, it’s very important for students to practice the NCERT exemplar problems to prepare well for the boards and the competitive exams.

Here, we are providing the NCERT Exemplar Problems for Class 12 Biology chapter - Ecosystem, in the PDF form which students may download and solve them to analyse their preparedness for the exams.

 Main topics discussed in Class 12 Biology, Chapter 14- Ecosystem, are:

  • Ecosystem–Structure and Function
  • Productivity
  • Decomposition
  • Energy Flow
  • Ecological Pyramids
  • Ecological Succession
  • Nutrient Cycling
  • Ecosystem Services.

 Download the complete NCERT Exemplar book from the following link:

Class 12 Biology NCERT Exemplar Problems: Ecosystem

Note: Once you are done with all the NCERT Exemplar problems, refer the solutions given above in this article to check the correctness of your own solutions and know the right way to get the perfect answers.

Class 12 Biology NCERT Solutions

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