With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
An ovule is a female megasporangium where the formation of megaspores takes place. (figure)
The various parts of an ovule are
Funiculus - It is a stalk-like structure which represents the point of attachment of the ovule to the placenta of the ovary.
Hilum-It is the point where the body of the ovule is attached to the funiculus
Integuments -They are the outer layers surrounding the ovule that provide protection to the developing embryo.
Micropyle - It is a narrow pore formed by the projection of integuments. It marks the point where the pollen tube enters the ovule at the time of fertilization.
Nucellus - It is a mass of the parenchymatous tissue surrounded by the integuments from the outside. The nucellus provides nutrition to the developing embryo. The embryo sac is located inside the nucellus.
Chalazal - It is the based swollen part of the nucellus from where the integuments originate.
Similar Questions
Choose the odd one w.r.t. gynoecium.
Choose the odd one w.r.t. gynoecium.
In angiosperms, functional megaspore develops into
In angiosperms, functional megaspore develops into
- [AIPMT 2011]
Which of the following cells of embryo sac degenerate after fertilisation in angiosperms?
Which of the following cells of embryo sac degenerate after fertilisation in angiosperms?
$A$ : Eight cells of octant stage in dicot embryogeny are made by $2$ vertical and one transverse divisions in
embryonal cell.
$R$ : These cells are arranged in epibasal and hypobasal tier.
$A$ : Eight cells of octant stage in dicot embryogeny are made by $2$ vertical and one transverse divisions in
embryonal cell.
$R$ : These cells are arranged in epibasal and hypobasal tier.