microspore

How To Use microspore In A Sentence

• Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
• Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
• Some of the large sphenophyte trees of the Paleozoic were heterosporous, producing large megaspores and small microspores, and probably retaining the megaspore in the strobilus.
• Within the microsporangium, the microspores are embedded in a foamy mass that is dispersed as ‘floats’.
• Although this relationship may vary between species, for a particular species it is constant, indicating that the polarity of the pollen grain owes its origin to the topology of microspore tetrad formation.
• Their heterosporous life cycle (including both megaspores and microspores) is likely to be an adaptation to their aquatic habit.
• The embryogenic process originated during anther culture may have different origins, for example, haploid cells such as microspores or pollen grains, or somatic cells from anther tissues.
• 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
• The pollen cells are formed from mother cells by a process of cell division and subsequent setting free of the daughter cells or pollen cells by rejuvenescence, which is distinctly comparable with that of the formation of the microspores of Lycopodiaceæ, etc. The subsequent behavior of the pollen cell, its division and its fertilization of the germinal vesicle or oosphere, leave no doubt as to its analogy with the microspore of vascular cryptogams. Scientific American Supplement, No. 531, March 6, 1886
• At the late stage of the sporogenous cells, mother pollen cells and microspores, the vacuoles remarkably increased in quantity or size.