1. 12th Class Biology Notes _ Organisms and Populations- ( जीव एवं समष्टियाँ )

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Organisms and Populations

Organisms and Populations is an important chapter in Biology that deals with the interaction of living organisms with their environment. An organism is an individual living being that can perform basic life processes such as nutrition, respiration, growth, reproduction, and response to stimuli. A population is a group of individuals of the same species living in a particular geographical area at a given time.

The chapter explains how organisms adapt to different environmental conditions. Factors such as temperature, water, light, soil, and humidity greatly influence the survival and distribution of organisms. Organisms show different adaptations to survive in their surroundings. For example, desert plants have special features that help them conserve water.

Population ecology studies characteristics such as population density, birth rate, death rate, age distribution, and sex ratio. Population size changes due to births, deaths, immigration, and emigration. The growth of a population may be exponential or logistic, depending on the availability of resources and environmental conditions.

The chapter also describes various population interactions, including mutualism, competition, predation, and parasitism. These interactions affect the survival and growth of different species.

Overall, the study of organisms and populations helps us understand biodiversity, ecological relationships, adaptations, and the balance of nature.