Article: pollen grain
A Dictionary of Plant Sciences;      95 words ...pollen grain A microspore in flowering plants, which germinates to form the male gametophyte , a structure made up of the pollen grain plus a pollen tube . The grain contains 3 haploid nuclei (a tube nucleus and 2 sperm nuclei), which pass down the tube to the ovum...endosperm . The ...

Article: Reproduction in Plants
Biology;      700+ words ......from the parents. In flowering plants (angiosperms), the seed...chromosomes per cell. In flowering plants, the large, familiar...usually many ovules. Flowering plants are unique in that their...gametophyte is the mature pollen grain. Pollen is produced ...

Article: flowering plants
A Dictionary of Biology;      5 words ...flowering plants See Anthophyta .

Article: porate
A Dictionary of Plant Sciences;      9 words ...porate Applied to a pollen grain which has 1 or more pores .

Article: Anthophyta
A Dictionary of Plant Sciences;      11 words ...Anthophyta The division that includes all flowering plants ( angiosperms ).

Article: tricolpate
A Dictionary of Plant Sciences;      9 words ...tricolpate Of a pollen grain , having 3 colpi (see COLPUS ).

Article: Flora
The Oxford Dictionary of Phrase and Fable;      9 words ...Flora in Roman mythology, the goddess of flowering plants.

Article: sulcus
A Dictionary of Ecology;      11 words ...sulcus A furrow or groove. On the surface of a pollen grain , a colpus .

Article: nexine
A Dictionary of Plant Sciences;      11 words ...nexine ( endexine ) In a pollen grain , the inner layer of the exine .

Article: intine
A Dictionary of Plant Sciences;      10 words ...intine The innermost layer of the wall of a pollen grain or spore.

Article: colpate
A Dictionary of Plant Sciences;      11 words ...colpate Applied to a pollen grain that has 1 or more colpi (see COLPUS ).

Article: sexine
A Dictionary of Plant Sciences;      12 words ...sexine ( ectexine , ektexine ) In a pollen grain , the outer layer of the exine .

Article: vegetative nucleus
A Dictionary of Plant Sciences;      11 words ...vegetative nucleus The tube-nucleus of a pollen grain in a flowering plant.

Article: double fertilization
A Dictionary of Ecology;      57 words ...double fertilization In flowering plants, the union of one sperm nucleus with the egg nucleus and...form a triploid endosperm nucleus. The male gametophyte (the pollen grain and pollen tube) contains three sperm nuclei, but one (the...