MeSH definition : A growth from a pollen grain down into the flower style which allows two sperm to
pass, one to the ovum within the ovule, and the other to the central cell of the ovule
to produce endosperm of SEEDS.;
A growth from a pollen grain down into the flower style which allows two sperm to
pass, one to the ovum within the ovule, and the other to the central cell of the ovule
to produce endosperm of SEEDS.