Revision Notes For Class 12 Biology Chapter 13 Organisms And Populations

If a species needs to continue its lineage, one of the foremost criteria is to maintain a healthy number of population. There were many species that existed before humans, and most of them thrived up until they were hunted to extinction.

One of the most prominent records of a species going extinct because of humans was the moa – a large flightless bird that was endemic to New Zealand. Before humans hunted them to extinction, their only predator was the Haast’s eagle, one of the largest species of eagles to have ever existed. Learn more about organisms and population by exploring Biology Revision Notes for Class 12 Chapter 13 – Organisms and Populations, only on BYJU’s.

CBSE Notes for Class 12 Maths Chapter 13 – Organisms And Populations

Further Reading


Frequently asked Questions on CBSE Class 12 Biology Notes Chapter 13: Organisms and Populations


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.


Leave a Comment

Your Mobile number and Email id will not be published.



Tuition Center
Tuition Centre
free trial
Free Trial Class
Scholarship Test
Scholarship Test
Question and Answer
Question & Answer