• Last Update December 15, 2020


Biology has evolved as a field of science since it is a natural science concerned with the study of life and living organisms. Biology is important to everyday life because it allows humans to better understand their bodies, their resources and potential threats in the environment. It helps people to understand every organism alive, from the smallest bacteria to human being.

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24 Lessons


Draft Lesson

Chapter 6: Life Processes?

Life processes are the basic functions performed by living organisms to survive on earth. It happening in both active and inactive stage of organism. Some of the life processes are nutrition, respiration, transportation, excretion, etc. Every living organism needs energy for performing every life processes.

Chapter 8: How do organisms reproduce?

Living things can reproduce, or produce new organisms of the same type. There are two basic types of reproduction; sexual reproduction and asexual reproduction. Sexual reproduction requires the two cells from different individuals unite to produce the first cell of a new organism. In asexual reproduction a single organism can reproduce without the aid of another.

Chapter 9: Heredity and Evolution?

At the centre of the theory of evolution as proposed by Charles Darwin and Alfred Russell Wallace were the concepts of variation and natural selection. Hereditary variants were thought to arise naturally in populations, and then these were either selected for or against by the contemporary environmental conditions. In this way, subsequent generations either became enriched or impoverished for specific variant types. Over the long term, the accumulation of such changes in populations could lead to the formation of new species and higher taxonomic categories. However, although hereditary change was basic to the theory, in the 19th-century world of Darwin and Wallace, the fundamental unit of heredity—the gene—was unknown. The birth and proliferation of the science of genetics in the 20th century after the discovery of Mendel’s laws made it possible to consider the process of evolution by natural selection in terms of known genetic processes.

Chapter 15 – Our Environment

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