Evolution
Evolution: Overview
In evolution, the variations occur in the inherited traits for the survival of organisms in diverse niches. These variations occur by natural selection, mutation and genetic recombination that are broadly discussed in this topic.
Important Questions on Evolution
What is Speciation? Mention the factors could lead to the rise of a new species.
According to Darwin, Natural selection is a restrictive force and not a creative force as it only sorts out the individuals with useful variations. But he did not explain the causes of variations and mode of transmission of variations to the next generation. His theory explains only the survival of the fittest but does not explain the arrival of the fittest. So, he himself admitted that "natural selection has been the main but not the exclusive means of evolution."
How animal evolution has taken place?
What is the role of geographical isolation in the formation of two subpopulations of a species? Explain.
Carbon-dating is one of the tools for determining the evolutionary relationship between organisms.
Which among the following are used as tool(s) for tracing the evolutionary relationship between organisms?
List tools for tracing evolutionary relationship.
The evolution of long-necked giraffes is supported by Darwin's mechanism of evolution based on:
"Survival of the fittest" supports the theory of natural selection.
Name of the scientist who concluded that “the species produce more offsprings than can survive” was _____ (Charles Darwin/Malthus).
Changes in DNA due to recombination during asexual reproduction are the basic causes of evolution.
Fill in the blank with the correct answer from the bracket.
_____ is the study of past life on the basis of fossil records. (Palaeontology, Palynology, Physiology)
Fossils are also called written documents of evolution.
The organs which have a similar basic structure and similar embryonic origin are called 'X' organs. 'X' features arise from adaptive behaviour, to adapt to different environmental conditions and modes of life. The organs which are quite different in fundamental structure and embryonic origin are called 'Y' organs. 'Y' feature arises when two unrelated species adapt themselves to similar climate and environmental condition.
Wings of bird, bat, insects are examples of X or Y?
Differentiate between allopatric and sympatric speciation with a neat sketch.
Broccoli has been developed from _____cabbage through artificial selection.
The name of the ship in which Darwin undertook his famous voyage is _____(HMS Beagle/NMS Beagle).
Name the technique used to detect the age of the fossils. (Radioactive dating/Radioactive carbon/Spectrum dating)
What are the remnants of organisms of remote past known as?
