CBSE Class 12 Biology NCERT Exemplar Solutions: Chapter 13, Organisms and Populations
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 are designed to increase the application skills of the students. The solutions to these problems can be arrived at only after a thorough understanding of the concepts involved in a subject.
NCERT Exemplar Solutions for Class 12 Biology Chapter - Organisms and Populations:
In this article we are providing the precise solutions to all the NCERT Exemplar Problems for chapter Organisms and Populations. All these solutions have been prepared by the subject matter experts. These solutions are designed in the most appropriate and the simplest way so as to help students easily understand the theories employed. This will help them make an easy preparation for the exams.
Few problems along with their solutions from this chapter are given follows:
Q. Ecotone is
(a)a polluted area
(b)the bottom of a lake
(c)a zone of transition between two communities
(d)a zone of developing community
Ans. (c) a zone of transition between two communities
The adjacent biotic (natural) communities generally do not possess a fine demarcation edge or line between them. The adjacent of two communities is represented by population of both the communities, and this transition zone between two communities is referred as ecotone.
Q. What is diapause and its significance?
Ans. Under unfavourable conditions many zooplankton species in lakes and ponds are known to enter diapause, a stage of suspended development.
Q. What is brood parasitism? Explain with the help of an example.
Ans. Brood parasitism is the phenomenon in which an organism (parasite) lays eggs on the nest of other organism (host). e.g., Cuckoo (koel) bird lays its eggs in the nest of its host and lets the host incubate them. The eggs of the parasitic bird resemble the host's egg in size and colour to reduce the chances of the host bird detecting the foreign eggs«and ejecting them from the nest.
Q. Do you agree that regional and local variations exist within each biome? Substantiate your answer with suitable example.
Ans. A biome can be define as the large communities of the world a-; shows that area with similar climate have communities of same type. Climate is the mar factor that determines the type of soil which in turn determines the type of vegetation. The type of vegetation and climate together determine the kind of microorganisms and animals.
The other determining factors are latitude and altitude, intensity and duration of winter and summer days, water mass and topography. The main biome of the world does not show boundary of any country and regional and local variations exist in each biome.
e.g., temperate deciduous forest receives an annual precipitation between 75-150 cm and tropical rain forest show a rainfall above 140 cm/yr which may reach up to 400 cm/yr.
Find below the links to download Class 12 Biology NCERT Exemplar Solutions for chapter 13 - Organisms and Populations:
Link to Download PDF
Multiple Choice Questions
Very Short answer type questions
Short answer type questions
Long answer types questions
Class 12 Biology NCERT Exemplar Problems:
NCERT Exemplar book for class 12 Biology consists of a collection of conceptual questions which are designed purely to check a student’s understanding about the various concepts and theories explained in the subject. These problems form the best practice source to prepare effectively for board exams and the medical entrance tests.
Here, we are providing the NCERT Exemplar Problems for Class 12 Biology chapter - Organisms and Populations, 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 12- Organisms and Populations, are:
- Organism and its environment
- Major abiotic factors
- Responses to abiotic factors
- Population attributes
- Population growth
- Life history variation
- Population interactions.
Download the complete NCERT Exemplar book from the following link:
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.