Origin of life — Chapter Summary
ICSE · Class 12 · Biology
Summary of Origin of life for ICSE Class 12 Biology. Part of the ICSE Class 12 Biology syllabus. Life is the power that an organism possesses to maintain.
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Overview
Life is the power that an organism possesses to maintain and reproduce itself. The origin of life is treated as a unique event in the history of the universe. Modern biology explains it as a gradual process linked with chemical evolution on the primitive earth. The chapter covers early ideas such as
Key Concepts
The cosmos is believed to have
The cosmos is believed to have originated 10-20 billion years ago through the big bang. Earth formed about 4.5 billion years back in the solar system.
Life is described as having originated
Life is described as having originated on earth due to a supernatural event. It is based on faith and lies outside scientific investigation because it
This old idea states that life
This old idea states that life can arise from non-living organic matter without the intervention of living things. Ancient thinkers such as Anaximande
Biogenesis states that life arises only
Biogenesis states that life arises only from pre-existing life. Redi’s three-jar experiment, Spallanzani’s sealed-flask experiment and Pasteur’s swan-
This modern theory explains the biochemical
This modern theory explains the biochemical origin of life through gradual chemical evolution. Oparin gave the first scientific account in 1924 and Ha
Learning Objectives
- Understand the major views on the origin of life
- Differentiate between special creation, spontaneous generation, biogenesis and biochemical evolution
- Describe the Oparin-Haldane theory in its main steps
- Explain the Miller-Urey experiment and its significance
- Define important terms such as abiogenesis, coacervates, protobionts and chemogeny
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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