Asked by  | 8th Jun, 2009, 11:11: PM

Expert Answer:

Flowers develop one or more of the following means to ensure cross pollination:

i) Unisexuality

ii) Dichogamy, either protandry or protogyny

iii) Heterostyly

iv) Self-sterility


Chasmogamous flowers often prefer cross pollination.

 Examples of angiosperms that produce seed without fertilisation - Several species of Citrus Euphorbia dulcis, Mangifera indica, Solanum nigram, Orchis maculate, Nicotiana tabacum

Answered by  | 9th Jun, 2009, 08:46: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.