Here is a comprehensive, exhaustive question bank based on Chapter 6 (Evolution), structured into the three required sections.
SECTION A: EXHAUSTIVE ONE-LINER QUESTION BANK
Q1. What is the study of the history of life forms on earth called? -> Evolutionary Biology.
Q2. How are stellar distances measured? -> In light years.
Q3. What is the estimated age of the universe? -> Almost 13.8 billion years old.
Q4. Which theory attempts to explain the origin of the universe? -> The Big Bang theory.
Q5. When was the earth supposed to have been formed? -> About 4.5 billion years back.
Q6. Which gases covered the surface of early earth from the molten mass? -> Water vapour, methane, carbon dioxide, and ammonia.
Q7. What broke up water into hydrogen and oxygen on early earth? -> UV rays from the sun.
Q8. Which gas escaped into space from early earth after water breakup? -> $H_2$ (Hydrogen).
Q9. What did oxygen combine with to form water, $CO_2$, and other components? -> Ammonia and methane.
Q10. When did life appear after the formation of earth? -> 500 million years after the formation of earth (almost four billion years back).
Q11. What were the transfer units of life to different planets as thought by early Greek thinkers? -> Spores.
Q12. What is the name of the idea regarding the transfer of spores to planets that is still a favourite among some astronomers? -> Panspermia.
Q13. What was the long-held belief that life came out of decaying and rotting matter called? -> The theory of spontaneous generation.
Q14. Who demonstrated through careful experimentation that life comes only from pre-existing life? -> Louis Pasteur.
Q15. What materials were used in Louis Pasteur’s experiment to disprove spontaneous generation? -> Pre-sterilised flasks and killed yeast.
Q16. Who proposed that the first form of life could have come from pre-existing non-living organic molecules? -> Oparin (of Russia) and Haldane (of England).
Q17. What term is given to the formation of diverse organic molecules from inorganic constituents prior to life? -> Chemical evolution.
Q18. What were the environmental conditions on early earth during chemical evolution? -> High temperature, volcanic storms, and a reducing atmosphere containing $CH_4$, $NH_3$, etc.
Q19. Which American scientist created conditions similar to early earth in a laboratory scale in 1953? -> S.L. Miller.
Q20. What specific apparatus component was used by Miller to create energy equivalent to lightning? -> Electric discharge / electrodes / spark discharge in a closed flask.
Q21. What specific temperature was maintained or what gases were present in Miller’s closed flask experiment? -> $CH_4, H_2, NH_3$, and water vapour at $800^\circ\text{C}$.
Q22. What primary organic compounds were observed by S.L. Miller in his experiment? -> Amino acids.
Q23. What other compounds were observed by others in similar simulation experiments? -> Sugars, nitrogen bases, pigments, and fats.
Q24. What extraterrestrial objects were analyzed and found to contain similar organic compounds, supporting chemical evolution? -> Meteorites.
Q25. When could the first non-cellular forms of life have originated? -> About 3 billion years back.
Q26. What were the likely components of the first non-cellular forms of life? -> Giant molecules like RNA, protein, polysaccharides, etc.
Q27. When did the first cellular form of life possibly originate? -> About 2000 million years ago.
Q28. What was the probable nature and environment of the first cellular forms of life? -> Single-cells in a water environment only.
Q29. What version of biogenesis, stating that the first life arose slowly through evolutionary forces from non-living molecules, is accepted by the majority? -> Chemical evolution leading to biological evolution / abiogenesis through chemical evolution.
Q30. What conventional religious literature theory tells us that all living organisms were created as such? -> The theory of special creation.
Q31. How many connotations does the theory of special creation have according to the text? -> Three.
Q32. What is the assumed age of the earth according to the theory of special creation? -> About 4000 years old.
Q33. During which century were the ideas of special creation strongly challenged? -> The nineteenth century.
Q34. What was the name of the sail ship used by Charles Darwin for his round-the-world sea voyage? -> H.M.S. Beagle.
SECTION B: CONCEPT-BASED & ANALYTICAL QUESTIONS
Q1. Multiple-Choice Question (Application & Analysis)
Consider the following statements regarding the origin of life and chemical evolution:
- Early earth possessed an oxidizing atmosphere rich in free oxygen gas that promoted the immediate synthesis of amino acids.
- S.L. Miller’s laboratory experiment utilized a mixture of methane, hydrogen, ammonia, and water vapour subjected to spark discharge at $800^\circ\text{C}$.
- Analysis of meteorite contents revealed the presence of organic compounds similar to those produced in laboratory simulations.
Which of the statement(s) given above is/are correct?
- (A) 1 and 2 only
- (B) 2 and 3 only
- (C) 1 and 3 only
- (D) 1, 2, and 3
Q2. Statement Combination Question (Critical Evaluation)
With reference to the theories of origin of life, match or evaluate the following assertions:
- Assertion (A): Louis Pasteur conclusively dismissed the theory of spontaneous generation once and for all.
- Reason (R): Pasteur demonstrated through pre-sterilised flask experiments that life arises only from pre-existing life, whereas closed/sterilized systems did not spawn life from killed yeast unless exposed to air/pre-existing life.
Which of the following is correct?
- (A) Both (A) and (R) are true, and (R) is the correct explanation of (A).
- (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
- (C) (A) is true, but (R) is false.
- (D) (A) is false, but (R) is true.
Q3. Conceptual Multi-Statement Question (UPSC/GRE Standard)
Which of the following historical milestones and timelines regarding the universe and earth are correctly stated?
- The universe is approximately 13.8 billion years old.
- The earth was formed about 4.5 billion years back.
- The first non-cellular forms of life originated approximately 4.5 billion years ago, concurrent with earth’s formation.
- The first cellular forms of life originated about 2000 million years ago.
Select the correct answer using the codes below:
- (A) 1, 2, and 4 only
- (B) 2 and 3 only
- (C) 1, 3, and 4 only
- (D) 1, 2, 3, and 4
Q4. Analytical Question (Theory of Special Creation vs. Darwinian Observations)
The theory of special creation rests on specific dogmas concerning biodiversity and earth’s age. Which of the following core tenets were challenged by Charles Darwin’s observations aboard the H.M.S. Beagle?
- All living species observed today were created in their current form from the very beginning.
- Biological diversity has remained entirely constant and unchanged since the moment of creation.
- The earth is remarkably young, specifically estimated at around 4,000 years of age.
- Extinctions of historical life forms do not occur, and new forms never arise dynamically.
Choose the correct code:
- (A) 1 and 2 only
- (B) 1, 2, and 3 only
- (C) 2, 3, and 4 only
- (D) 1, 2, 3, and 4
SECTION C: COMPLETE ANSWER KEYS & EXPLANATIONS
Answer Key: Section A (One-Liners)
- Evolutionary Biology
- Light years
- Almost 13.8 billion years old
- The Big Bang theory
- About 4.5 billion years back
- Water vapour, methane, carbon dioxide, and ammonia
- UV rays from the sun
- $H_2$ (Hydrogen)
- Ammonia and methane
- 500 million years after earth’s formation (almost four billion years back)
- Spores
- Panspermia
- The theory of spontaneous generation
- Louis Pasteur
- Pre-sterilised flasks and killed yeast
- Oparin and Haldane
- Chemical evolution
- High temperature, volcanic storms, reducing atmosphere ($CH_4, NH_3$, etc.)
- S.L. Miller
- Electric discharge / spark discharge in a closed flask
- $CH_4, H_2, NH_3$, and water vapour at $800^\circ\text{C}$
- Amino acids
- Sugars, nitrogen bases, pigments, and fats
- Meteorites
- About 3 billion years back
- Giant molecules (RNA, protein, polysaccharides, etc.)
- About 2000 million years ago
- Single-cells in a water environment only
- Biogenesis through chemical evolution
- The theory of special creation
- Three
- About 4000 years old
- The nineteenth century
- H.M.S. Beagle
Answer Key & Detailed Explanations: Section B (Concept-Based & Analytical)
- Q1. Correct Option: (B) 2 and 3 only
- Explanation: Statement 1 is incorrect because early earth did not have an oxidizing atmosphere; rather, it featured a reducing atmosphere lacking free oxygen, characterized by methane ($CH_4$), ammonia ($NH_3$), water vapour, and hydrogen ($H_2$). Statements 2 and 3 are correct as they directly mirror Miller’s experimental parameters ($800^\circ\text{C}$, spark discharge, reducing gas mix) and corroborating meteorite findings.
- Q2. Correct Option: (A) Both (A) and (R) are true, and (R) is the correct explanation of (A)
- Explanation: Louis Pasteur’s ingenious experiments with pre-sterilized flasks conclusively proved that life does not spontaneously emerge from non-living or rotting matter (like killed yeast) unless pre-existing life forms gain access from the outside air, thus dismissing the theory of spontaneous generation permanently.
- Q3. Correct Option: (A) 1, 2, and 4 only
- Explanation: Statement 3 is incorrect because non-cellular life forms originated approximately 3 billion years back (not 4.5 billion years ago, which is when the earth itself formed). Statements 1 (universe age ~13.8 billion years), 2 (earth formation ~4.5 billion years), and 4 (cellular life origin ~2000 million years ago) are factual milestones from the text.
- Q4. Correct Option: (D) 1, 2, 3, and 4
- Explanation: The conventional theory of special creation assumes three main dogmas: (1) all current species were created in their exact present forms, (2) biodiversity has been constant since creation, and (3) earth is roughly 4,000 years old. Charles Darwin’s observations during the H.M.S. Beagle voyage revealed historical extinctions and gradual evolutionary divergence, directly challenging all these tenets.
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