"The Origin of Life on Earth" Evolution of Biology PPT Courseware 3

Description

"The Origin of Life on Earth" Evolution of Biology PPT Courseware 3

Various hypotheses about the origin of life

Viewpoint 1: Creationism

Viewpoint 2: Spontaneous generation theory

Viewpoint 3: Extraterrestrial origin theory

Viewpoint 4: Chemical evolution 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 mud 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: Extraterrestrial origin theory

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.

Meteorites contain organic matter needed to form living organisms. What inferences can be made from this?

From the fact that meteorites contain organic matter required to constitute living organisms, it can be speculated that the organic matter constituting living organisms can be formed from outside the earth and brought to the earth.

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.

ANALYSE information

1. What are the obvious differences between the composition of the original atmosphere on Earth and the composition of the current atmosphere?

The present atmosphere contains oxygen, but the original atmosphere did not contain oxygen.

2. Do you think life existed on the primitive earth? Please give your reasons.

Life did not exist on 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?

According to the experimental results of Miller and other scholars, it can be speculated 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.

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.

In-class training

1. Under primitive earth conditions, life originated from:

A. Primitive land B. Primitive ocean

C. Primitive atmosphere D. Near volcanoes

2. Which of the following substances does not exist in the original atmosphere?

A. Water vapor B. Ammonia

C. Oxygen D. Methane

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For more information about the PPT courseware "Evolution of Biology and the Origin of Life on Earth", please click on the "Evolution of Biology and the Origin of Life on Earth" PPT courseware.

"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 5:

"The Origin of Life on Earth" Biological Evolution PPT Courseware 5 Exploration Read several hypotheses about the origin of life and talk about which view you agree with more. View 1: Creationism This view holds that life was created by God or gods. Viewpoint 2: It happens naturally..

"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..

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Update Time: 2024-11-21

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 2 industry PPT template

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