POST-FERTILIZATION Flashcards
Endosperm development is after the embryo development.
True/false
False
precedes
The cells of endosperm tissue are filled with ____ and are used for ____of developing embryo
reserve food material, nutrition
The PEN initially undergoes successive nuclear divisions OR both nuclear div., cell wall formation.
Successive nuclear divisions
The stage of endosperm development where PEN gives rise to many free nuclei is called __________
Free-nuclear endosperm
How does the endosperm become cellular?
Cell wall formation takes place after free nuclear divisions
No. of free nuclei formed before cellularisation is const.
True/false
False
Varies greatly
What is the stage of endosperm development where cell wall formation has taken place called ?
Cellular endosperm
Coconut water from tender coconut is ________ endosperm
free nuclear(1000s of nuclei)
white kernel surrounding coconut water is ________ endosperm
Cellular
Endosperm completely consumed by the developing embryo before seed maturation- eg.
3
Pea,groundnut,beans
Endosperm persists in mature seed and used up during seed germination - egs.
2
Castor, coconut
Embryo develops at the chalazal/micropylar end where the zygote is situated.
Micropylar
Most zygotes divide before endosperm is formed.
true/false
False
after certain amount of endosperm is formed
Why is embryo formed after endosperm?
To provide assured nutrition to developing embryo
Embryo development is also known as ________
Embryogeny
Earlier stages of embryogeny are different in monocots and dicots.
True/false
False
Similar
Stages of embryogeny in dicots :
Zygote –> proembryo –> globular –> Heart-shaped –> Mature embryo(radicle , plumules , cotyledons)
The portion of embryonal axis above the level of cotyledons is ________ and terminates with ____ called ____tip.
epicotyl, Plumule, stem
The cylindrical portion of embryonal axis below the level of cotyledons is ____ that terminates at its lower end in the ____ or ____ tip covered with ______
Hypocotyl, radicle, root tip, root cap
In monocots , the cotyledon is called ________ and is situated towards ____ side of the embryonal axis.
scutellum, lateral
At its lower end in monocots , the embryonal axis has ________ and ____ enclosed in an ________(differentiated/undifferentiated) sheath called _________
Radicle, root cap, undiff. , coleorrhiza
Epicotyl is above/below the level of attachment of scutellum.
above
Epicotyl has a root apex and many leaf primordia enclosed in a solid foliar structure called coleoptile.
True/false
False
Shoot, a few, hollow
