18140.Tendrils in plants are an example of
Convergent evolution
Adaptive radiation
Divergent evolution
Co-evolution
18141.The idea of Natural selection as the fundamental process of evolutionary changes was reached
Independently by Charles Darwin and Alfred Russel Wallace in 1900.
By Charles Darwin in 1866.
By Alfred Russel Wallace in 1901.
Independently by Charles Darwin and Alfred Russel Wallace in 1859.
18142.Which one of the following statements is correct?
There is no evidence of the existence of gills during embryogenesis of mammals
Stem cells are specialized cells
Ontogeny repeats phylogeny
All plant and animal cells are totipotent
18143.When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed:
Microevolution
Divergent evolution
Convergent evolution
Co-evolution
18144.Select the correct statement from the following:
Fitness is the end result of the ability to adapt and gets selected by nature
Darwinian variations are small and directionless
Mutations are random and directional
All mammals except whales and camels have seven cervical vertebrae
18145.Jurassic period of the Mesozoic era characterized by
Dinosaurs become extinct and angiosperms appear
Radiation of reptiles and origin of mammal like reptiles
Gymnosperms are dominant plants and first birds appear
Flowering plants and first dinosaurs appear
18146.The extinct human who lived 1,00,000 to 40,000 years ago, in Europe, Asia and parts of Africa, with short stature, heavy eye brows, retreating fore heads, large jaws with heavy teeth, stocky bodies, a lumbering gait and stooped posture was
Cro-Magnon humans
Ramapithecus
Homo habilis
Neanderthal human
18147.Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from nonliving matter
Microbes did not appear in stored meat
Meat was not spoiled, when heated and kept sealed in a vessel
Larva could appear in decaying organic matter
Microbes appeared form unsterilized organic matter
18148.Fossils are most commonly preserved in
Metamorphic rocks
Igneous rocks
Sedimentary rocks
Any type of rock
18149.Homologous organs indicate the
Convergent evolution
Parallel evolution
Common descendent
Natural selection
18150.Coacervates were experimentally produced by______.
Fischer and Huxley
Sidney Fox and Oparin
Urey and Miller
Jacob and Monod
18151.
Assertion: The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
Reason: The first autotrophic organisms were the chemo-autotrophs that never released oxygen.
Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
Assertion is true statement but Reason is false.
Both Assertion and Reason are false statements.
18152.What is common to whale, seal and shark?
Homeothermy
Seasonal migration
Thick subcutaneous fat
Convergent evolution
18153.The concept of chemical evolution is based on
Possible origin of life by combination of chemicals under suitable environmental conditions
Crystallization of chemicals
Interaction of water, air and clay under intense heat
Effect of solar radiation on chemicals
18154.What was the most significant trend in the evolution of modern man (Homo sapiens) from his ancestors?
Increasing brain capacity
Upright posture
Shortening of jaws
Binocular vision