An important evidence in favour of organic evolution is the occurrence of
homologous and vestigial organs
analogous and vestigial organs
homologous organs only
homologous organs only
A.
homologous and vestigial organs
An important evidence in favour of organic evolution is the occurrence of homologous and vestigial organs. Homologous organs are those which have the common origin and are built on the same fundamental pattern but they perform different functions and have different appearances e.g., whale's flipper, bat's wings, cat's paw, horse's front leg, bird's wing, ox's front leg and human hand.
Vestigial organs in animals are those having no function now, in them, but had important functions in their ancestors.
Analogous organs are quite different in fundamental structure and embryonic origin but perform the same function. The study of analogous organs illustrates the occurrence of convergent evolution.
What is common to whale, seal and shark?
Seasonal migration
Thick subcutaneous fat
Convergent evolution
Convergent evolution
The concept of chemical evolution is based on
cyrstallization of chemicals
interaction of water, air and clay under intense heat
effect of solar radiation on chemicals
effect of solar radiation on chemicals
Industrial melanism as observed in peppered moth proves that
The true black melanic forms arise by a recurring random mutation.
The melanic form of the moth has no selective advantage over lighter form in industrial area
The lighter-form moth has no selective advantage either in polluted industrial area or non-polluted area
The lighter-form moth has no selective advantage either in polluted industrial area or non-polluted area
The finches of Galapagos islands provide an evidence in favour of
special creation
evolution due to mutation
retrogressive evolution
retrogressive evolution
When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed
divergent evolution
microevolution
co-evolution
co-evolution
Adaptive radiation refers to
adaptations due to geographical isolation
evolution of different species from a common ancestor
migration of members of a species to different geographical areas
migration of members of a species to different geographical areas
Which one of the following amino acids was not found to be synthesized in Miller's experiment?
Glycine
Aspartic acid
Glutamic acid
Glutamic acid
Which one of the following statement is correct?
Stem cells are specialize cells
There is no evidence of the existence of gills during embryogensis of mammals
All plant and animal cells are totipotent
All plant and animal cells are totipotent
About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and
phosphorus and sulphur
sulphur and magnesium
magnesium and sodium
magnesium and sodium
