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Who proposed that the first form of life...

Who proposed that the first form of life could have come from pre- existing non living organic molecules?

A

Alfred Wallace

B

Drosophila

C

Charles Darwin

D

Louis Pasteur

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Who proposed that the first form of life could have come from per-existing non-living organic molecules ?

In 1953 S.L. Miller created primitive earth conditions in the laboratory and gave experimental evidence for origin of first from of life from pre existing non-living organic molecules.The primitive earth conditions created include:

The first form of life on earth consisting of nucleic acid along with inorganic and organic molecules are known as................

Louis pasteur's experiment, if you recall, proved that life can arise from only pre existing life, can we correct this as life evolves from pre-existing life or other-wise we will never answer the question as to how the first form of life arose? comment

Answer the following Read the paragraph and answer the questions given below it. A biotic carbon atoms are circulated into the biotic form through processes like photosynthesis and respiration. Green plants convert carbon dioxide into carbohydrates and also produce carbon compounds like proteins and fats. Biotic compounds are transported from plants to apex consumers through intermediate trophic levels. After the death of all types of consumers, carbon is recycled by biotic decomposition. The carbon recycled in this way goes into the atmosphere and can be taken up by living organisms thus ensuring circulation and recycling of carbon in the biosphere. What process plays a significant role to ensure that carbon is available to living organisms even after the death of apex consumers?

Which of the following theory states that, the life originated on the earth from non-living matter?

Read the following statements and find out the incorrect statement. A. Ultimately all the food that is respired for life processes comes from photosynthesis. B. The energy released by oxidation in respiration is directly used for the life processes. C The carbon skeleton produced during respiration is used as precursors for biosynthesis of other molecules in cell. D. Plants, unlike animals, have no specialised organs for gaseous exchange but they have stomata and lenticels for this purpose. E. During oxidation within a cell, all the energy contained in, respiratory substrates is released free into the cell in a single step, which is trapped as chemical energy in the form of ATP.

By choosing appropriate words given in the bracket, complete the paragraph: (translation, anticodon ,tRNA , mRNA, amino acids, triplet codon, transcription, DNA) The.'.….' formed in nucleus comes in cytoplasm. It brings in the coded message from DNA. The message contains the codes for amino acids. The code for each amino acid consists of three nucleotides. It is called as.'.....' each mRNA is made up of thousands of triplet codons. As per the message on mRNA.'.........' are supplied by the .'......' For the purpose, tRNA has .'.......' having complementary sequence to the codon on mRNA. This is called '.........'.

Answer the following Read the paragraph and answer the questions given below it. A biotic carbon atoms are circulated into the biotic form through processes like photosynthesis and respiration. Green plants convert carbon dioxide into carbohydrates and also produce carbon compounds like proteins and fats. Biotic compounds are transported from plants to apex consumers through intermediate trophic levels. After the death of all types of consumers, carbon is recycled by biotic decomposition. The carbon recycled in this way goes into the atmosphere and can be taken up by living organisms thus ensuring circulation and recycling of carbon in the biosphere. Draw a simple food chain to show transfer of carbon from plants to decomposers.

CHETANA PUBLICATION-ORIGIN AND EVOLUTION OF LIFE -Exercise
  1. Who proposed that the first form of life could have come from pre- exi...

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  2. The sequence of origin of life may be.

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  3. In Hardy-Weinberg equation, the frequency of homozygous recessive indi...

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  4. Select the analogous organs.

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  5. Archaeopteryx is known as missing link because it is a fossil and shar...

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  6. Identify the wrong statement regarding evolution.

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  7. Gene frequency in a population remain constant due to-

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  8. Which of the following characteristic is not shown by the ape?

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  9. can be considered as connecting link between ape and man.

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  10. The Cranial capacity of Nanderthal man was

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  11. About 15 billion years ago, single titanic explosion occurred which is...

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  12. ....................... years ago, earth was formed.

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  13. Protobiogenesis refers as .....................

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  14. According to the ........................, all the living beings on th...

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  15. The first chemicals formed on the earth were

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  16. The primitive sea containing molecules of organic substance free of .....

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  17. What is considered as a landmark in the origin of life ?

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  18. The first form of life on earth consisting of nucleic acid along with ...

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  19. Name the island where Darwin visited while formulating the theory of N...

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  20. The prebiotic atmosphere of the earth was............

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