Download App

Evolution — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYEvolution3 Marks
Question
State the views of Oparin and Haldane on evolution. How does S.L. Miller's experiment support their views?

OR

  1. Explain the theory of abiogenesis.
  2. How did Miller demonstrate experimentally the chemical evolution that happened three billion years ago?
✓

Answer

  1. Theory of chemical evolution or abiogenesis was proposed by Oparin and Haldane.
  2. It states that the first form of life could have come from pre-existing non-living organic molecules (like RNA, proteins, etc.) and that formation of life was preceded by chemical evolution, i.e. formation of diverse organic molecules from inorganic constituents.

Miller's experiment:

  1. He created conditions similar to the primitive earth in the laboratory
  2. Electric discharge was produced by using electrodes) in a closed flask, containing methane, hydrogen, ammonia and water vapour.
  3. The temperature was kept at 800°C.
  4. After a week, he observed formation of amino acids.
  5. Such molecules must have reacted among themselves to form giant, self-replicating molecules, the first form of life.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Evolution→Evolution — all question types→BIOLOGY STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

Name the cells that nourish the germ cells in the testes. Where are these cells located in the testes?
→
The diversity of plants and animals is not uniform throughout the world but shows a rather uneven distribution. Explain with example.
→
Explain how surrogacy is helpful in case of an infertile woman.
→
How biodiversity is important for functional ecosystem?
→
In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?
→
If origin of life is in progress in any other planet, what would be the condition there?
→


  1. Is the trait recessive or dominant?
  2. Is the trait sex-linked or autosomal?
  3. Give the genotypes of the parents in generation I and of their third and fourth child in Generation II.
→
Draw a schematic diagram of the E.coli vector PBR 322 and mark the following in it:
  1. Ori
  2. Rop
  3. Ampicillin-resistant gene
  4. Tetracycline-resistant gene
  5. Restriction site BamHI
  6. Restriction site EcoRI
→
Explain Predation
→
How are the structural genes activated in the lac operon in E. coli?
→