Two sperm nuclei from a pollen grain ( the microgametophyte ), rather than a single sperm, enter the archegonium of the megagametophyte; one fuses with the egg nucleus to form the zygote, the other fuses with two other nuclei of the gametophyte to form'endosperm', which nourishes the developing embryo.
32.
In the families Lycopodiaceae and Huperziaceae, gametophytes are subterranean and mycotrophic, deriving nutrients from symbiosis with fungi . " Isoetes " and " Selaginella ", which are heterosporous, megagametophytes develop inside the megaspores, which crack open at the trilete suture to allow the male gametes to access the egg cells in the archegonia inside.
33.
Plants generally produce ovules of four shapes : the most common shape is called "'anatropous "', with a curved shape . "'Orthotropous "'ovules are straight with all the parts of the ovule lined up in a long row producing an uncurved seed . "'Campylotropous "'ovules have a curved megagametophyte often giving the seed a tight " C " shape.
34.
Seed maturity cannot be predicted accurately from cone flotation, cone moisture content, cone specific gravity; but the province of B . C . found embryo occupying 90 % + of the corrosion cavity and megagametophyte being firm and whitish in colour are the best predictors for white spruce in B . C ., and Quebec can forecast seed maturity some weeks in advance by monitoring seed development in relation to heat-sums and the phenological progression of the inflorescence of fireweed ( " Epilobium angustifolium"
How to say megagametophyte in Hindi and what is the meaning of megagametophyte in Hindi? megagametophyte Hindi meaning, translation, pronunciation, synonyms and example sentences are provided by Hindlish.com.
