How To Use nucellus In A Sentence
- The entrance of pollen-tubes into the nucellus by the chalaza, instead of through the micropyle, was first fully demonstrated by Treub in his paper "Sur les More Letters of Charles Darwin — Volume 2
- Only one pollen tube tip entered the nucellus through the micropyle.
- (Liliaceae) polyembryony results from an adventitious production of embryos from the cells of the nucellus around the top of the embryo-sac. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
- The nucellus is a cellular tissue enveloping one large cell, the embryo-sac or macrospore. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
- In some cases the embryo or the embryo-sac sends out suckers into the nucellus and ovular integument. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
- During sexual megagametophytic development (with the embryo sac as the megagametophyte and the egg cell as megagamete), a sub-epidermal cell of the nucellus tissue differentiates into a megaspore-mother cell which undergoes meiosis I and II to form four megaspores.
- In addition, the grains were observed to float in water with sacci uppermost, consistent with the suggestion that distally placed sacci serve to orientate the germinal furrow of the pollen grain towards the nucellus of an inverted ovule.
- The development of the ovule, which represents the macrosporangium, is very similar to the process in Gymnosperms; when mature it consists of one or two coats surrounding the central nucellus, except at the apex where an opening, the micropyle, is left. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
- The plants included are, however, mainly well-established parasites, and the absence of nucellus is only one of those characters of reduction to which parasites are liable. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
- In some plants the nucellus is not thus absorbed, but itself becomes a seat of deposit of reserve-food constituting the _perisperm_ which may coexist with endosperm, as in the water-lily order, or may alone form a food-reserve for the embryo, as in _Canna_. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1