与 «MEGASPORANGIUM»相关的英语书籍
在以下的参考文献中发现
megasporangium的用法。与
megasporangium相关的书籍以及同一来源的简短摘要提供其在 英语文献中的使用情境。
1
The Evolutionary Biology of Plants
As I noted earlier, the Calamocarpon cones were mono- or bisporan- giate,
contained one functional megaspore per megasporangium, and when mature,
released the megasporangium with its single functional megaspore as a unit.
2
The Evolution of the Land Plants (Embryophyta)
The megasporangia and microsporangia are borne in separate sporocarps,
which in Salvinia are similar in size but in Azolla are of unequal size, only a
single megasporangium being developed in the sporocarp, which is much
smaller than ...
Douglas Houghton Campbell, 1940
3
Plants: Diversity and Evolution
An ovule is derived from a megasporangium containing a single megaspore that
is never released, and in which the megasporangium is protected by a layer
called the integument. The process of evolution of seeds from a
megasporangium ...
Martin Ingrouille, Bill Eddie, 2006
4
Botany For Degree Pteridophyta
In. S. rupestris the megaspore is never shed and fertilisation and development of
embryo up to the formation of rhizophore, stem and cotyledons takes place while
the megaspore is enclosed within the megasporangium, which retains its ...
In Selaginella erythropus the megasporangium contains only one megaspore
which functions. Similarly, in Marsilea most of the megaspore mother cells
degenerate. The phenomenon may become distincts either before or after
meiosis.
6
Botany: An Introduction to Plant Biology
Figure 22-7 A reconstruction of the megasporangium (b) and adjacent telomes (a
) of Archaeosperma arnoldii. Each sporangium contained only one large
megaspore; the other three products of the spore mother cell meiosis apparently
...
7
Cryptogams: Algae, Bryophyta and Pterldophyta
(ii) Formation of one megaspore within a megasporangium. (Hi)
Megasporangium is enclosed in an additional envelope called the integument. (
iv) The megaspore is permanently retained within the megasporangium. (v) In-
situ fertilisation and ...
8
The Evolution of Plants
This would have protected the megasporangium from desiccation and attack.
According to taxonomic nomenclature, once an outer coat or integument has
formed around a megasporangium, it technically becomes an ovule, since in
structure it ...
Kathy Willis, Jennifer McElwain, 2013
9
Paleobotany and the Evolution of Plants
In addition to a massive adaxial micro- or megasporangium, the sporophyll is
composed of a pedicel with a more or less developed lateral lamina. The distal
portion of the sporophyll is expanded and at right angles to the pedicel. This
distal ...
Wilson Nichols Stewart, 1993
10
Seeds: Ecology, Biogeography, and, Evolution of Dormancy and ...
The megasporangium (or nucellus) in gymnosperms is relatively large, and it
contains the megaspore, which divides and gives rise to the female gametophyte
(Figure 12.9a). The female gametophyte has one (or more) archegonium(ia),
each ...
Carol C. Baskin, Jerry M. Baskin, 2014
包含词语«MEGASPORANGIUM»的新条目
找出国内和国际出版社所讨论的内容，以及词语
megasporangium在以下新条目的上下文中是如何使用的。
NCERT fails to index errors it rectified
The paper asked for the equivalent structure of Megasporangium. The options included Ovule and Nucellus and others. However, according to ... «Hindustan Times, 四月 14»
Teaching wrong biology, NCERT fails to upload Errata
The paper asked for the equivalent structure of Megasporangium. The answers asked students to pick one among Ovule and Nucellus and ... «Hindustan Times, 三月 14»
