- In cannot eliminate useless or
harmful characters.
It can eliminate useless or
harmful characters.
- Highly useful characters get
preserved in the race.
Useful characters cannot be
preserved in the progenies.
- Self-pollination does not
introduce any variations and
hence the offspring are
unable to adapt to the
changed environment.
Cross-pollination introduce
variations in the offsprings.
These variations make these
plants to adapt better to the
changed environment for the
struggle for existence.
- Immunity of the race towards
disease falls in the succeeding
progenies.
Immunity of the race towards
disease is usually marinated in
the succeeding progenies.
- Yield of the plant gradually
falls with time.
Yield of the plant usually does
not fall.
- Self-pollination never helps
in the production of new
varieties and species.
Cross-pollination is a mechanism
of roducing new varieties and
species among plants.
