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Authoritative PPT Summary
"The Origin of Life on Earth" Evolution of Biology PPT Courseware 5
Explore Read several hypotheses about the origin of life and tell which view you agree with more.
Viewpoint 1: Creationism
This view holds that life was created by God or gods.
Viewpoint 2: Spontaneous generation theory
This view holds that life arises naturally from inanimate matter. For example:
The ancient Chinese believed that fireflies could grow from rotting haystacks and maggots could grow from carrion.
The ancient Egyptians believed that the frogs and eels in the Nile Valley were produced from the silt exposed to sunlight.
In the 17th century, the Belgian scholar Helmont conducted such an experiment to prove the theory of spontaneous generation: stuffing grains and shabby shirts into bottles and leaving them in a dark place would produce mice in 21 days.
Viewpoint 3: Yu Sheng said
This view holds that life on Earth came from other planets in the universe. Certain microbial spores can attach to interstellar dust particles and fall to Earth, giving the Earth its initial life. In 1969, amino acids were discovered in a meteorite that crashed in the town of Mackison, Australia.
Viewpoint 4: Chemical evolution theory
This view holds that under primitive earth conditions, inorganic substances could generate a variety of organic substances. These organic substances underwent long-term and complex evolution in the primitive ocean, and primitive life finally appeared.
Origin of Life
1. Characteristics of the 4.6 billion-year-old primitive Earth:
It was blazing, with the red sun scorching in the sky, lightning and thunder, and volcanoes erupting on the ground, with lava overflowing. All elements are in a gaseous state and there is no life...
2. Conditions provided by the primitive earth for the origin of life
(1) Place: primitive atmosphere and primitive ocean
(2) Substances: methane (CH4), ammonia (NH3), water (H2O), hydrogen (H2), hydrogen sulfide (H2S), hydrogen cyanide (HCN), etc.
(3) Energy: cosmic rays, ultraviolet rays, lightning, energy released by volcanic eruptions, etc.
1. How were the primitive oceans formed?
Answer: In the early days of the formation of the primitive earth, the temperature was very high. As the earth continued to dissipate heat, the scorching surface temperature of the earth gradually cooled down. The water vapor in the primitive atmosphere condensed into rain and fell to the surface of the earth. After a long time, the primitive ocean was formed. .
2. Describe the general process of the formation of primitive life.
Answer: The organic matter gathered in the primitive ocean continuously interacted with each other. After an extremely long time, about 1 billion years after the formation of the earth, primitive life was formed.
3. What role did the primitive ocean play in the origin of life?
Answer: A large amount of organic matter and various minerals gathered in the primitive ocean, which provided the possibility for the collection of organic matter. Therefore, it can be said that the primitive ocean is the cradle of life. Without the primitive ocean, there would be no primitive life.
Summary of this lesson
1. Four major hypotheses on the origin of life
2. Primitive life may have been born in primitive oceans or alien planets.
3. Primitive life only appeared about 1 billion years after the earth was formed.
4. Miller’s experiment shows that organic matter that constitutes living organisms can be formed in the primitive earth environment.
5. What are the main components of the original atmosphere?
In-class training
1. Under primitive earth conditions, life originated from:
A. Primitive land B. Primitive ocean
C. Primitive atmosphere D. Near volcanoes
2. The important signs of the birth of primitive life are:
A. Has original boundary membrane and material exchange ability
B. Interaction between proteins and nucleic acids
C. Has primitive metabolism and self-reproduction ability
D. Cell structure with eukaryotic cells
ANALYSE information
1. What are the obvious differences between the composition of the original atmosphere on Earth and the composition of the current atmosphere?
Answer: There is oxygen in the current atmosphere, but there was no oxygen in the original atmosphere.
2. Do you think life existed on the primitive earth? Please give your reasons.
Answer: Life did not exist on the primitive earth. Because there were no environmental conditions for life on the primitive earth.
3. Based on the experimental results of Miller and other scholars, what inferences can be made about the origin of life?
Answer: Based on the experimental results of Miller and other scholars, it can be inferred that although life could not be formed on the primitive earth, organic matter that constituted living organisms could be produced. Therefore, the origin of life from inorganic matter to organic matter is completely achievable.
4. Meteorites contain organic matter needed to form living organisms. What inferences can be made from this?
Answer: From the fact that meteorites contain organic matter required to constitute living organisms, it can be inferred that the organic matter constituting living organisms can be formed from outside the earth and brought to the earth.
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"The Origin of Life on Earth" Evolution of Biology PPT Courseware 6:
"The Origin of Life on Earth" PPT courseware on the evolution of living things 6 Please think about how long it took for the earth to come into existence? Was there life after the creation of the earth? Approximately how long ago did humans come into being? How did it come about? What were the earliest organisms on earth like?
"The Origin of Life on Earth" Evolution of Biology PPT Courseware 4:
"The Origin of Life on Earth" Evolution of Biology PPT Courseware 4 The earth was born 4.6 billion years ago. Was there life on the earth at first? What were the earliest creatures? 1. Several hypotheses about the origin of life 1. Creationism 2. Spontaneity 3. Cosmonogenesis 4. Chemical evolution..
"The Origin of Life on Earth" Evolution of Biology PPT Courseware 3:
"The Origin of Life on Earth" Evolution of Biology PPT Courseware 3 Various Hypotheses of the Origin of Life View 1: Creationism View 2: Spontaneous Origin View 3: Extraterrestrial Origin View 4: Chemical Evolution This view believes that life It occurs naturally from inanimate matter. ..