311) Given below are two statements each with one or more blanks. Select the option which correctly fills up the blanks in the statements.
Statements :
In a mixed population, those that can better-adapt, ___(i)___ and increase in population size. No variant is ____(ii)____ wiped out.
Similarly, excess use of herbicides, pesticides, etc., has only resulted in selection of resistant varieties in a much ____(iii)____ time scale. This is also true for microbes against which we employ antibiotics or drugs against eukaryotic organisms/cell. Hence, resistant organisms/cells are appearing in a time scale of months or years and not centuries.
These are examples of evolution by ____(iv)____ action. This also tells us that evolution is not a ____(v)_____ process in the sense of determinism. It is a ____(iv)____ process based on chance events in nature and chance _____(vii)_____ in the organisms.
376) The extinct human who lived 1,00,000 to 40,000 years ago, in Europe, Asia and parts of Africa. With short stature, heavy eyebrows, retreating fore heads, large jaws with heavy teeth, stocky bodies, a lumbering gait and stooped posture was