Origin of Life on the Earth
Origin of Life on the Earth
Origin of Life on Earth: When a species cannot evolve fast enough to compete in a changing environment, it may become extinct. This might happen, if the environment changes very quickly. e.g. extinction of tigers, etc.
JBS Haldane a British biologist, biochemist and geneticist, proposed in 1929 that life must have originated from the simple inorganic molecules which might have originated on the Earth through a long series of physiochemical changes, to more complex organic molecules that were brought about first by chemical evolution. This gradual change or development of complex forms from simpler forms is known as organic evolution.
Stanley L Miller and Harold C Urey in 1953 gave an experimental supportto Haldane’s theory of origin of life. They created an atmosphere similar to that which existed on early Earth (containing hydrogen, ammonia, methane, hydrogen, sulphide and water vapour, but no oxygen) over water in an airtight apparatus. This was maintained at a temperature just below 100°C and sparks were passed through the mixture of gases to stimulate lightening. At the end of a week, 1 5% of the carbon from CH4 had been converted to simple carbon compounds, including amino acids (which make up protein molecule).
_______________________ in 1953 gave an experimental supportto Haldane’s theory of origin of life. | |||
| Right Option : A | |||
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_________in 1953 gave an experimental support to Haldane’s theory of origin of life. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct ? (a) JBS Haldane proposed that life must have originated from the simple inorganic molecules which might have originated on the Earth. (b) The gradual change or development of complex forms from simpler forms is known as organic evolution. (c) An atmosphere similar to that which existed on early Earth over water was created in an airtight apparatus to study the origin of life . | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [10]
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
