Louis Pasteur, a French Scientist took in a long necked flask and then he bent the neck of the flask. He boiled the broths in the flask. The curved neck acted as a filter. If the flask with 'swan neck' (curved neck) is kept for months together, no life appeared, as the germ laden dust particles in the air were trapped by the curved neck which serves as filter. If the swan neck was broken, the broths developed colonies of moulds and bacteria. Thus, he showed that the source putrefaction such as for milk, sugar, wine etc. was the air and organism did not arise from the nutrient media. Louis Pasteur, (famous for Germ Theory of Disease and Immunology) finally disapproved a biogenesis and proved biogenesis. But, according to biogenesis-life originated from preexisting life which does not explain the origin of life. So, biogenesis is also disapproved.
TS EAMCET-2018 / AMU-2005 / Karnataka CET -2001
Evolution
184832
Whereas the earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than
1 4,200 million years ago
2 3,500 million years ago
3 1,600 million years ago
4 459 million years ago
Explanation:
Whereas the earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than 3,500 million years ago The estimated origin of life on Earth is based on scientific evidence and research. Some evidences are - (i) Fossil record . The oldest known fossil of simple, single - celled organisms, such as stromatolites, date back to around 3.5 billion years ago. (ii) Geochemical analysis. Geochemical studies of ancient rocks and minerals suggest the presence of conditions suitable for life around this time. These rocks contain isotopic signatures that indicate the presence of biological processes.
NEET -2020 Phase II / AMU-1997
Evolution
184883
Following are the two statements regarding the origin of life
1 Both (A) and (B) are false
2 (A) is correct but (B) is false
3 (B) is correct but (A) is false
4 Both (A) and (B) are correct
Explanation:
Both statements are correct because primitive atmosphere was reducing and chlorophyll appeared later on. According to the origin of life the first originated organism on earth were the prokaryotic heterotrophs. which were non-green and they were anaerobes as oxygen was not available on earth at that time. So, the first autotrophic organisms were dependent on chemicals and were known as chemoautotrophs. The first autotrophic organism were the chemoautotrophs that never released oxygen. Chemoautrophs are organisms that obtained energy by the oxidation of electron donors in their environments.
NEET-2016 Phase-I
Evolution
184885
In present times the origin of life is not possible from inorganic compounds due to :
1 Raw material not available
2 High conc. of \(\mathrm{O}_{2}\) in atmosphere
3 Decrease in temperature
4 Excess of pollution
Explanation:
In present times the origin of life is not possible from inorganic compounds due to high conc. of \(\mathrm{O}_{2}\) in atmosphere. - The earth is highly rich in oxygen today which does not provide the suitable environment for evolution. The conditions of present environment is not conductive for the synthesis of complex molecules because oxygen attacks the chemical bonds and extracts electrons.
AIPMT-1998
Evolution
184887
Modern synthetic theory of evolution is not involved in
1 gene mutation
2 gene recombination
3 natural selection
4 increase in size
Explanation:
D The modern synthetic theory of evolution (also called modern synthesis) merges the concept of Darwinian evolution with Mendelian genetics resulting in a unified theory of evolution. It is also known as the Neo-Darwinian theory and was introduced by a number of evolutionary biologists. This theory of evolution includes the reproductive, geographical isolation, genetic variations, gene mutation, recombination and the natural selection, Increase in size was given by the use and disuse of organs' theory under ' Lamarckism.
Louis Pasteur, a French Scientist took in a long necked flask and then he bent the neck of the flask. He boiled the broths in the flask. The curved neck acted as a filter. If the flask with 'swan neck' (curved neck) is kept for months together, no life appeared, as the germ laden dust particles in the air were trapped by the curved neck which serves as filter. If the swan neck was broken, the broths developed colonies of moulds and bacteria. Thus, he showed that the source putrefaction such as for milk, sugar, wine etc. was the air and organism did not arise from the nutrient media. Louis Pasteur, (famous for Germ Theory of Disease and Immunology) finally disapproved a biogenesis and proved biogenesis. But, according to biogenesis-life originated from preexisting life which does not explain the origin of life. So, biogenesis is also disapproved.
TS EAMCET-2018 / AMU-2005 / Karnataka CET -2001
Evolution
184832
Whereas the earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than
1 4,200 million years ago
2 3,500 million years ago
3 1,600 million years ago
4 459 million years ago
Explanation:
Whereas the earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than 3,500 million years ago The estimated origin of life on Earth is based on scientific evidence and research. Some evidences are - (i) Fossil record . The oldest known fossil of simple, single - celled organisms, such as stromatolites, date back to around 3.5 billion years ago. (ii) Geochemical analysis. Geochemical studies of ancient rocks and minerals suggest the presence of conditions suitable for life around this time. These rocks contain isotopic signatures that indicate the presence of biological processes.
NEET -2020 Phase II / AMU-1997
Evolution
184883
Following are the two statements regarding the origin of life
1 Both (A) and (B) are false
2 (A) is correct but (B) is false
3 (B) is correct but (A) is false
4 Both (A) and (B) are correct
Explanation:
Both statements are correct because primitive atmosphere was reducing and chlorophyll appeared later on. According to the origin of life the first originated organism on earth were the prokaryotic heterotrophs. which were non-green and they were anaerobes as oxygen was not available on earth at that time. So, the first autotrophic organisms were dependent on chemicals and were known as chemoautotrophs. The first autotrophic organism were the chemoautotrophs that never released oxygen. Chemoautrophs are organisms that obtained energy by the oxidation of electron donors in their environments.
NEET-2016 Phase-I
Evolution
184885
In present times the origin of life is not possible from inorganic compounds due to :
1 Raw material not available
2 High conc. of \(\mathrm{O}_{2}\) in atmosphere
3 Decrease in temperature
4 Excess of pollution
Explanation:
In present times the origin of life is not possible from inorganic compounds due to high conc. of \(\mathrm{O}_{2}\) in atmosphere. - The earth is highly rich in oxygen today which does not provide the suitable environment for evolution. The conditions of present environment is not conductive for the synthesis of complex molecules because oxygen attacks the chemical bonds and extracts electrons.
AIPMT-1998
Evolution
184887
Modern synthetic theory of evolution is not involved in
1 gene mutation
2 gene recombination
3 natural selection
4 increase in size
Explanation:
D The modern synthetic theory of evolution (also called modern synthesis) merges the concept of Darwinian evolution with Mendelian genetics resulting in a unified theory of evolution. It is also known as the Neo-Darwinian theory and was introduced by a number of evolutionary biologists. This theory of evolution includes the reproductive, geographical isolation, genetic variations, gene mutation, recombination and the natural selection, Increase in size was given by the use and disuse of organs' theory under ' Lamarckism.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
Evolution
184830
Swan necked flask experiment proved
1 biogenesis
2 abiogenesis
3 gene therapy
4 Both (a) and (b)
Explanation:
Louis Pasteur, a French Scientist took in a long necked flask and then he bent the neck of the flask. He boiled the broths in the flask. The curved neck acted as a filter. If the flask with 'swan neck' (curved neck) is kept for months together, no life appeared, as the germ laden dust particles in the air were trapped by the curved neck which serves as filter. If the swan neck was broken, the broths developed colonies of moulds and bacteria. Thus, he showed that the source putrefaction such as for milk, sugar, wine etc. was the air and organism did not arise from the nutrient media. Louis Pasteur, (famous for Germ Theory of Disease and Immunology) finally disapproved a biogenesis and proved biogenesis. But, according to biogenesis-life originated from preexisting life which does not explain the origin of life. So, biogenesis is also disapproved.
TS EAMCET-2018 / AMU-2005 / Karnataka CET -2001
Evolution
184832
Whereas the earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than
1 4,200 million years ago
2 3,500 million years ago
3 1,600 million years ago
4 459 million years ago
Explanation:
Whereas the earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than 3,500 million years ago The estimated origin of life on Earth is based on scientific evidence and research. Some evidences are - (i) Fossil record . The oldest known fossil of simple, single - celled organisms, such as stromatolites, date back to around 3.5 billion years ago. (ii) Geochemical analysis. Geochemical studies of ancient rocks and minerals suggest the presence of conditions suitable for life around this time. These rocks contain isotopic signatures that indicate the presence of biological processes.
NEET -2020 Phase II / AMU-1997
Evolution
184883
Following are the two statements regarding the origin of life
1 Both (A) and (B) are false
2 (A) is correct but (B) is false
3 (B) is correct but (A) is false
4 Both (A) and (B) are correct
Explanation:
Both statements are correct because primitive atmosphere was reducing and chlorophyll appeared later on. According to the origin of life the first originated organism on earth were the prokaryotic heterotrophs. which were non-green and they were anaerobes as oxygen was not available on earth at that time. So, the first autotrophic organisms were dependent on chemicals and were known as chemoautotrophs. The first autotrophic organism were the chemoautotrophs that never released oxygen. Chemoautrophs are organisms that obtained energy by the oxidation of electron donors in their environments.
NEET-2016 Phase-I
Evolution
184885
In present times the origin of life is not possible from inorganic compounds due to :
1 Raw material not available
2 High conc. of \(\mathrm{O}_{2}\) in atmosphere
3 Decrease in temperature
4 Excess of pollution
Explanation:
In present times the origin of life is not possible from inorganic compounds due to high conc. of \(\mathrm{O}_{2}\) in atmosphere. - The earth is highly rich in oxygen today which does not provide the suitable environment for evolution. The conditions of present environment is not conductive for the synthesis of complex molecules because oxygen attacks the chemical bonds and extracts electrons.
AIPMT-1998
Evolution
184887
Modern synthetic theory of evolution is not involved in
1 gene mutation
2 gene recombination
3 natural selection
4 increase in size
Explanation:
D The modern synthetic theory of evolution (also called modern synthesis) merges the concept of Darwinian evolution with Mendelian genetics resulting in a unified theory of evolution. It is also known as the Neo-Darwinian theory and was introduced by a number of evolutionary biologists. This theory of evolution includes the reproductive, geographical isolation, genetic variations, gene mutation, recombination and the natural selection, Increase in size was given by the use and disuse of organs' theory under ' Lamarckism.
Louis Pasteur, a French Scientist took in a long necked flask and then he bent the neck of the flask. He boiled the broths in the flask. The curved neck acted as a filter. If the flask with 'swan neck' (curved neck) is kept for months together, no life appeared, as the germ laden dust particles in the air were trapped by the curved neck which serves as filter. If the swan neck was broken, the broths developed colonies of moulds and bacteria. Thus, he showed that the source putrefaction such as for milk, sugar, wine etc. was the air and organism did not arise from the nutrient media. Louis Pasteur, (famous for Germ Theory of Disease and Immunology) finally disapproved a biogenesis and proved biogenesis. But, according to biogenesis-life originated from preexisting life which does not explain the origin of life. So, biogenesis is also disapproved.
TS EAMCET-2018 / AMU-2005 / Karnataka CET -2001
Evolution
184832
Whereas the earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than
1 4,200 million years ago
2 3,500 million years ago
3 1,600 million years ago
4 459 million years ago
Explanation:
Whereas the earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than 3,500 million years ago The estimated origin of life on Earth is based on scientific evidence and research. Some evidences are - (i) Fossil record . The oldest known fossil of simple, single - celled organisms, such as stromatolites, date back to around 3.5 billion years ago. (ii) Geochemical analysis. Geochemical studies of ancient rocks and minerals suggest the presence of conditions suitable for life around this time. These rocks contain isotopic signatures that indicate the presence of biological processes.
NEET -2020 Phase II / AMU-1997
Evolution
184883
Following are the two statements regarding the origin of life
1 Both (A) and (B) are false
2 (A) is correct but (B) is false
3 (B) is correct but (A) is false
4 Both (A) and (B) are correct
Explanation:
Both statements are correct because primitive atmosphere was reducing and chlorophyll appeared later on. According to the origin of life the first originated organism on earth were the prokaryotic heterotrophs. which were non-green and they were anaerobes as oxygen was not available on earth at that time. So, the first autotrophic organisms were dependent on chemicals and were known as chemoautotrophs. The first autotrophic organism were the chemoautotrophs that never released oxygen. Chemoautrophs are organisms that obtained energy by the oxidation of electron donors in their environments.
NEET-2016 Phase-I
Evolution
184885
In present times the origin of life is not possible from inorganic compounds due to :
1 Raw material not available
2 High conc. of \(\mathrm{O}_{2}\) in atmosphere
3 Decrease in temperature
4 Excess of pollution
Explanation:
In present times the origin of life is not possible from inorganic compounds due to high conc. of \(\mathrm{O}_{2}\) in atmosphere. - The earth is highly rich in oxygen today which does not provide the suitable environment for evolution. The conditions of present environment is not conductive for the synthesis of complex molecules because oxygen attacks the chemical bonds and extracts electrons.
AIPMT-1998
Evolution
184887
Modern synthetic theory of evolution is not involved in
1 gene mutation
2 gene recombination
3 natural selection
4 increase in size
Explanation:
D The modern synthetic theory of evolution (also called modern synthesis) merges the concept of Darwinian evolution with Mendelian genetics resulting in a unified theory of evolution. It is also known as the Neo-Darwinian theory and was introduced by a number of evolutionary biologists. This theory of evolution includes the reproductive, geographical isolation, genetic variations, gene mutation, recombination and the natural selection, Increase in size was given by the use and disuse of organs' theory under ' Lamarckism.
Louis Pasteur, a French Scientist took in a long necked flask and then he bent the neck of the flask. He boiled the broths in the flask. The curved neck acted as a filter. If the flask with 'swan neck' (curved neck) is kept for months together, no life appeared, as the germ laden dust particles in the air were trapped by the curved neck which serves as filter. If the swan neck was broken, the broths developed colonies of moulds and bacteria. Thus, he showed that the source putrefaction such as for milk, sugar, wine etc. was the air and organism did not arise from the nutrient media. Louis Pasteur, (famous for Germ Theory of Disease and Immunology) finally disapproved a biogenesis and proved biogenesis. But, according to biogenesis-life originated from preexisting life which does not explain the origin of life. So, biogenesis is also disapproved.
TS EAMCET-2018 / AMU-2005 / Karnataka CET -2001
Evolution
184832
Whereas the earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than
1 4,200 million years ago
2 3,500 million years ago
3 1,600 million years ago
4 459 million years ago
Explanation:
Whereas the earth is believed to be 4,500 million years old, life on this planet is estimated to have originated not earlier than 3,500 million years ago The estimated origin of life on Earth is based on scientific evidence and research. Some evidences are - (i) Fossil record . The oldest known fossil of simple, single - celled organisms, such as stromatolites, date back to around 3.5 billion years ago. (ii) Geochemical analysis. Geochemical studies of ancient rocks and minerals suggest the presence of conditions suitable for life around this time. These rocks contain isotopic signatures that indicate the presence of biological processes.
NEET -2020 Phase II / AMU-1997
Evolution
184883
Following are the two statements regarding the origin of life
1 Both (A) and (B) are false
2 (A) is correct but (B) is false
3 (B) is correct but (A) is false
4 Both (A) and (B) are correct
Explanation:
Both statements are correct because primitive atmosphere was reducing and chlorophyll appeared later on. According to the origin of life the first originated organism on earth were the prokaryotic heterotrophs. which were non-green and they were anaerobes as oxygen was not available on earth at that time. So, the first autotrophic organisms were dependent on chemicals and were known as chemoautotrophs. The first autotrophic organism were the chemoautotrophs that never released oxygen. Chemoautrophs are organisms that obtained energy by the oxidation of electron donors in their environments.
NEET-2016 Phase-I
Evolution
184885
In present times the origin of life is not possible from inorganic compounds due to :
1 Raw material not available
2 High conc. of \(\mathrm{O}_{2}\) in atmosphere
3 Decrease in temperature
4 Excess of pollution
Explanation:
In present times the origin of life is not possible from inorganic compounds due to high conc. of \(\mathrm{O}_{2}\) in atmosphere. - The earth is highly rich in oxygen today which does not provide the suitable environment for evolution. The conditions of present environment is not conductive for the synthesis of complex molecules because oxygen attacks the chemical bonds and extracts electrons.
AIPMT-1998
Evolution
184887
Modern synthetic theory of evolution is not involved in
1 gene mutation
2 gene recombination
3 natural selection
4 increase in size
Explanation:
D The modern synthetic theory of evolution (also called modern synthesis) merges the concept of Darwinian evolution with Mendelian genetics resulting in a unified theory of evolution. It is also known as the Neo-Darwinian theory and was introduced by a number of evolutionary biologists. This theory of evolution includes the reproductive, geographical isolation, genetic variations, gene mutation, recombination and the natural selection, Increase in size was given by the use and disuse of organs' theory under ' Lamarckism.