How life began on earth — NEET & JEE Questions

Question 1 · difficulty L1 · recall

The early chemical-evolution concept associated with Oparin and Haldane:

• A. spontaneous generation in modern cells
• B. inheritance of acquired characters only
• C. special creation as a scientific mechanism
• D. chemical evolution from non-living molecules

Question 2 · difficulty L1 · recall

The experiment simulating early atmospheric conditions and producing organic molecules:

• A. Meselson-Stahl experiment
• B. Miller experiment
• C. Griffith experiment
• D. Hershey-Chase experiment

Question 3 · difficulty L2 · understanding

The chemical-evolution hypothesis proposes that the first organic molecules on early Earth arose from

• A. abiotic chemical reactions under primitive environmental conditions
• B. modern cells appearing fully formed at once
• C. photosynthesis by flowering plants
• D. only genetic recombination in existing organisms

Question 4 · difficulty L2 · understanding

The Miller-Urey experiment is important because it showed that

• A. organic molecules such as amino acids can form abiotically under simulated early-Earth conditions
• B. living cells can be created from amino acids in one step
• C. oxygen-rich air is required for all prebiotic synthesis
• D. DNA must form before simpler organic molecules

Question 5 · difficulty L2 · understanding

According to the Oparin-Haldane view, an early step toward life involved

• A. gradual chemical evolution before biological evolution
• B. immediate appearance of modern humans
• C. formation of oxygen-rich forests before simple molecules
• D. inheritance before replication existed

Question 6 · difficulty L3 · understanding

$$\text { Match List I with List II with respect to chronology of evolution of life forms }$$ List-I List-II A. About 65 mya I. Jawless fish probably evolved B. About 500 mya II. The dinosaurs suddenly disappeared from the earth C. About 350 mya III. Seaweeds and few plants probably existed D. About 320 mya IV. Invertebrates were formed and became active Choose the correct answer from the options given below:

• A. $\mathrm{A}(\mathrm{III}), \mathrm{B}(\mathrm{IV}), \mathrm{C}(\mathrm{I}), \mathrm{D}(\mathrm{II})$
• B. $\mathrm{A}(\mathrm{I}), \mathrm{B}(\mathrm{II}), \mathrm{C}(\mathrm{III}), \mathrm{D}(\mathrm{IV})$
• C. $\mathrm{A}(\mathrm{II}), \mathrm{B}(\mathrm{IV}), \mathrm{C}(\mathrm{III}), \mathrm{D}(\mathrm{I})$
• D. $\mathrm{A}(\mathrm{II}), \mathrm{B}(\mathrm{IV}), \mathrm{C}(\mathrm{I}), \mathrm{D}(\mathrm{III})$

Question 7 · difficulty L3 · understanding

What is the correct order (old to recent) of periods in Paleozoic era?

• A. Silurian, Devonian, Permian, Carboniferous
• B. Silurian, Devonian, Carboniferous, Permian
• C. Permian, Devonian, Silurian, Carboniferous
• D. Silurian, Carboniferous, Permian, Devonian

Question 8 · difficulty L3 · understanding

Match List I with List II: List - I List - II A. Mesozoic Era I. Lower invertebrates B. Proterozoic Era II. Fish & Amphibia C. Cenozoic Era III. Birds & Reptiles D. Paleozoic Era IV. Mammals Choose the correct answer from the options given below :

• A. A-II, B-I, C-III, D-IV
• B. A-III, B-I, C-II, D-IV
• C. A-I, B-II, C-IV, D-III
• D. A-III, B-I, C-IV, D-II

Question 9 · difficulty L3 · understanding

Panspermia, an idea that is still a favourite for some astronomers, means:

• A. Transfer of spores as unit of life from other planets to Earth
• B. Creation of life from dead and decaying matter
• C. Creation of life from chemicals
• D. Origin of sperm in human testes

Question 10 · difficulty L3 · understanding

From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask

• A. CH 3 , H 2 , NH 3 and water vapor at 600°C
• B. CH 4 , H 2 , NH 3 and water vapor at 800°C
• C. CH 3 , H 2 , NH 4 and water vapor at 800°C
• D. CH 4 , H 2 , NH 3 and water vapor at 600°C