genetics, evolution of life & ecological biodiversity - Category wise Question and Answer Practice Test with Solutions

Answer: (a)

Progressive evolution is the development of organisms with more elaborate and specialized structures from those having less elaborate features e.g. amphibians from reptiles.

Retrogressive or degenerative evolution is the development of simpler forms from more complex ones. Such evolution has occurred in the case of vestigial organs, parasitic forms, and in the reduction of overspecialized structures such as wings in flightless birds.

Parallel evolution is the formation of similar traits in related groups of organisms independently due to similar requirements e.g. running of two-toed deer and one toed horse.

The evolution of wings in insects and birds serve as an example of convergent evolution.

Answer: (b)

Answer: (d)

Answer: (c)

In 1953 Wilkins obtained very fine X-ray crystallographic pictures of DNA from which Watson and Crick developed the double helix model of DNA.

Answer: (b)

In human female ovum, number of autosome are 22 pairs.