Recent studies on Archaea suggest that life could haveoriginated (1) extra terrestrially and seeded through meteoriteimpacts. (2) in shallow coastal areas. (3) in deep hydrothermal vents. (4) in hot, terrestrial […]
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CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
The Permian–Triassic Extinction: When Over 95% of Marine Species Disappeared
During which of the following major mass extinction events, over 95% of the marine species disappeared from the planet Earth? (1) Ordovician (2) Devonian (3) Permian (4) Triassic Introduction Earth’s […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
The Devonian Period: The Age of Fishes
20. Which of the following periods is known as “Age of fishes”? (1) Devonian (2) Jurassic (3) Cambrian (4) Carboniferous Introduction The story of life on Earth is […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
What Was Missing? The Essential Ingredient Forgotten in a Miller-Urey Experiment Replication
You wanted to conduct Miller-Urey experiment and used a simplified apparatus with Tungsten electrodes. You heated the glassware at 5000C for 3 hours to remove any organic contaminants. Gases NH3, […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
Why Were the First Living Beings on Earth Anaerobic? The Role of Oxygen and Early Atmosphere
The first living beings on earth were anaerobic because (1) There was no oxygen in air (2) oxygen damages proteins (3) oxygen interferes with the action of ribozymes (4) they […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
Which Plant Groups Evolved During the Silurian Period?
Which of the following plant groups evolved during the Silurian period? (1) Bryophyta (2) Psilophyta (3) Lycophyta (4) Spherrophyta Introduction The Silurian period, spanning approximately 443 to 419 million […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
Why Did Complex Eukaryotic Cells Evolve? The Role of Energy Efficiency and Cellular Organization
Complex eukaryotic cells may have evolved fromsimpler prokaryotic cells because complexity oforganization increases the (1) growth rate (2) efficiency of energy utilization (3) tolerance to starvation (4) Ability to attain […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
The Cambrian Period: The Explosive Increase in Marine Invertebrate Diversity
During which geological period was there an explosive increase in the number of many marine invertebrate phyla? (1) Ordovician (2) Devonian (3) Permian (4) Cambrian Introduction The history of life […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
The Main Source of Earth’s Oxygen: How Photosynthesis Transformed the Planet’s Atmosphere
During the early origin of earth oxygen was absent in environment. Later on the oxygen increased and reached to present level. The main source of oxygen was (1) Photosynthesis (2) […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
The Greatest Diversification of Life on Earth: The Cambrian Period
During which geological period did the greatest diversification of life on earth occur? (1) Permian (2) Jurassic (3) Cambrian (4) Ordovician Introduction The history of life on Earth is marked […]
