The· eyes of Octopus and eyes of cat show different patterns of structure, yet they perform similar function. This is an example of
homologous organs that have evolved due to convergent evolution
homologous organs that have evolved due to divergent evolution
analogous organs that have evolved due to convergent evolution
analogous organs that have evolved due to divergent evolution
C.
analogous organs that have evolved due to convergent evolution
The analogous organs are not anatomically similar structures through they perform similar functions. Hence, analogous structures are a result of convergent evolution; different structures evolving for the same function and hence, having similarity. On the other hand, homologous organs developed along different direction due to adaptations to different needs. This is divergent evolution and the structures are homologous.
Darwin in the 'theory of natural selection' states that
characters acquired during the life of an individual are inherited by its offsprings
environment does not play any role in the evolution
natural selection acts on favourable variations, which appear among individuals of a species
heritable variations arises through changes in the gene complex of species
The direct ancestor of the living modern man is
Homo erechis
Homo neanderthalensis
Homo sapiens fossils
Homo sapiens sapiens
Reproductive isolation mechanism prevent interbreeding of naturally sympatric population. Given below are categories of isolating mechanisms. Choose the correct name for isolation when potential mates occupy overlapping ranges but reproduce at different times of the year.
Ecological isolation
Behavioural isolation
Temporal isolation
Mechanical isolation
Archaeopteryx is a connecting link between
pisces and amphibians
amphibians and reptiles
reptiles and birds
birds and mammals
Consider the following statements given below.
I. First living form originated from semi-arid land.
II. Nucleic acid were the first sign of life and represented beginning of life.
III. It was strongly beleived that prokaryotes evolved to from eukaryotes.
Choose the correct option
I and II
II and III
Only III
I, II and III
Industrial melanism is an
effect of industrial pollution
effect of mutation
evidence of survival of fittest
evidence of favour of natural selection
Parapatric speciation takes place when
a small segment of the original population becomes isolated reproductively
a part of the population becomes geographically isolated from the main population
a very different daughter species bud off from a semi- isolated peripheral population of ancestral species
a population of a species enters a new habitat
