Organisms and Population Class 12 Notes
Chapter 13 Organisms and Population
Organisms and populations are important topics for the study of living organisms in ecosystems and the process of breeding to create habitats. Students preparing for the CBSE Class 12 exam should definitely refer to the NCERT notes.
Vidyakul provides notes prepared by leading teachers and subject matter experts. These NCERT notes help students write and chart answers and comprehensively answer the questions asked on the exam. These notes describe organisms and their environments, various abiotic and biotic factors, their effects on adaptation, populations, population growth, and more. Continue reading the article for more details.
CBSE CLASS 12th BIOLOGY CH-13
Points to Remember
Below we have provided some of the important points to remember for NCERT notes for Class 12 Biology Chapter 13 to ace your exam:
Ecology is the study of reciprocal relationships of animals and plants with their surroundings.
Ecology concerns four levels of organisation: organism, population, community, and ecosystem.
Ecological factors, either alone or in combination, influence populations and communities in a given location.
Adaptation is a characteristic that allows organisms to survive and reproduce in their environment. When extremely unfavorable environmental conditions persist, the need for adaptation arises.
Individual organisms lack attributes such as natality, mortality, sex ratio, and age distribution that exist in populations.
Ecads and ecotypes are the two main characteristics of gene ecology. Ecads exhibit habitat-induced morphological changes without a change in genotype. Ecotypes are genotypic forms that adapt to changing adverse environments through mutations.
The three types of species that play important roles in community organization are dominant, key, and link species.
Topics and Sub-topics
Organisms and Populations is an important topic and deals with the study of living organisms in the ecological system and the process of interbreeding to make a living environment. Students preparing for the CBSE Class 12 board exams should make it a point to refer to the NCERT notes.
Click on the table below to get access to the NCERT Biology Chapter 13 chapter-wise important questions:
Ecology is the study of reciprocal relationships of animals and plants with their surroundings.
Ecology concerns four levels of organisation: organism, population, community, and ecosystem.
Ecological factors, either alone or in combination, influence populations and communities in a given location.
Adaptation is a characteristic that allows organisms to survive and reproduce in their environment. When extremely unfavorable environmental conditions persist, the need for adaptation arises.
Individual organisms lack attributes such as natality, mortality, sex ratio, and age distribution that exist in populations.
Ecads and ecotypes are the two main characteristics of gene ecology. Ecads exhibit habitat-induced morphological changes without a change in genotype. Ecotypes are genotypic forms that adapt to changing adverse environments through mutations.
The three types of species that play important roles in community organization are dominant, key, and link species.
Learn more about the same in Organisms and Population Class 12 Notes pdf.
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Frequently Asked Questions
Name some of the recently extinct species in India.
1. Asian straight-tusked elephant 2. Stegodon.3. Bharattherium.4. Sivatherium.5. Bramatherium.6. Megalochelys atlas.
What are the main reasons for extinction of species?
1. Demographic and genetic phenomena.2. Destruction of wild habitats.3. Introduction of invasive species.4. Climate change.5. Hunting and illegal trafficking.
What is meant by ‘Population variation’?
Population variance gives an idea of how data points in a specific population are spread out.
Name some of the recently extinct species in India.
What are the main reasons for extinction of species?
What is meant by ‘Population variation’?
Practice Questions
What is adaptation?
What is hibernation?
List out the Importance of light to plants?
Distinguish between Hibernation and Aestivation?
What are Biotic and Abiotic Factors of Living Organisms?
What is adaptation?
What is hibernation?
List out the Importance of light to plants?
Distinguish between Hibernation and Aestivation?
What are Biotic and Abiotic Factors of Living Organisms?
