Question

A perinial shrub has compound leaves, solitary zygomorphic epigynous flowers .Each flower reveals dichlamydous condition with many stamen and multiple fruit with exalbuminous seeds. What is the ratio of advanced and primitive characters in it .

ANS: 1:1 (pls give explanation)

Answer 1

According to phylogentic system of classification primitive characters are perennial nature, shrubby nature, solitary flower, numerous stamens, multiple or aggregate fruit, while advanced characters are compound leaves, zygomorphic flowers, epigynous flowers fused stamens, albuminous seeds.

The primitive characters in this case are :
1) perennial
2)shrubby nature
3) numerous stamen
4)multiple fruit

The advanced characrters in this case are:
1)compound leaves
2)zygomorphic flowers
3)epigynous flowers with fused stamens ( eg:dichlamydous condition)
4)exalbuminous seeds

Thus, the ratio of advanced and primitive characters in this case is 1:1.