parts of flower with titles. cross section of typical angiosperm flower at time of double fertilization

anatomy angiosperm anther antipodals background biology botanical botany cell cross diagram diploid double egg embryo english female fertilization filament flora flower gametophyte illustration integument isolated megagametophyte micropyle morphology nucellus nuclei ovary ovule part parts petal phytomorphology pistil plant polar reproduction sac scheme section stigma structure synergids title vector white