megaspore

How To Use megaspore In A Sentence

• They have male spores called microspores and female spores called megaspores.
• Meiosis results in the production of four megaspores, containing half the number of chromosomes of the sporophyte.
• In the ovules of most sexual flowering plants female gametogenesis is initiated from a single surviving gametic cell, the functional megaspore, formed after meiosis of the somatically derived megaspore mother cell (MMC) 1, 2. Naturejobs - All Jobs
• Microfossil assemblages from rare black and grey clays in this succession contain only a variety of seeds, Microcarpolithes hexagonalis and megaspores, and there are neither foraminifera nor other marine microfossils.
• Since the ‘seed habit’ begins with the reduction to a single functional megaspore in each megasporangium, heterospory seems like a logical intermediate step.
• Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
• These, as in Gymnosperms, are of two kinds, microspores or pollen-grains, borne in the stamens (or microsporophylls) and megaspores, in which the egg-cell is developed, contained in the ovule, which is borne enclosed in the carpel (or megasporophyll). Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
• Maternal apomictic embryos develop from a somatic cell within the ovule or from an unreduced embryo sac derived from the megaspore mother cell (diplospory).
• Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
• They have male spores called microspores and female spores called megaspores.