Module: | Embryo, Seed, Fruit & Apomixis
Q92: Consider the following statements regarding the anatomy and function of the hypostase:
1. The hypostase is a localized group of distinctly modified cells situated at the chalazal pole of the ovule, directly below the embryo sac.
2. Its heavily lignified or suberized cell walls are believed to halt the downward basal growth of the embryo sac into the chalaza.
3. Following double fertilization, the hypostase undergoes rapid mitotic division to form the primary bulk of the triploid endosperm.
Which of the above statements is/are correct?
2. Its heavily lignified or suberized cell walls are believed to halt the downward basal growth of the embryo sac into the chalaza.
3. Following double fertilization, the hypostase undergoes rapid mitotic division to form the primary bulk of the triploid endosperm.
Which of the above statements is/are correct?
✅ Correct Answer: A
The correct option is A. Statements 1 and 2 are correct, but Statement 3 is biologically incorrect.
In the intricate microscopic anatomy of the ovule, specialized tissues exist to guide development and nutrient flow.
The hypostase is a distinct cup-like layer of cells located at the chalazal base of the nucellus.
Structurally, these cells often develop thick walls rich in lignin or suberin.
Causally, botanists propose that this tough boundary acts as a physical barrier, preventing the aggressive, expanding embryo sac from pushing too far down into the chalazal tissue, while simultaneously acting as a physiological relay station connecting the vascular supply of the funicle to the embryo sac.
Statement 3 is a structural falsehood.
The hypostase is maternal sporophytic tissue (diploid). It never divides to form the endosperm; the endosperm strictly arises from the central cell via the triploid Primary Endosperm Nucleus (PEN).
In the intricate microscopic anatomy of the ovule, specialized tissues exist to guide development and nutrient flow.
The hypostase is a distinct cup-like layer of cells located at the chalazal base of the nucellus.
Structurally, these cells often develop thick walls rich in lignin or suberin.
Causally, botanists propose that this tough boundary acts as a physical barrier, preventing the aggressive, expanding embryo sac from pushing too far down into the chalazal tissue, while simultaneously acting as a physiological relay station connecting the vascular supply of the funicle to the embryo sac.
Statement 3 is a structural falsehood.
The hypostase is maternal sporophytic tissue (diploid). It never divides to form the endosperm; the endosperm strictly arises from the central cell via the triploid Primary Endosperm Nucleus (PEN).