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In a type of apomixis known as adventive embryony, embryos develop directly from the -
A
Synergids or antipodals in an embryo sac
B
Nucellus or integuments
C
Zygote
D
Accessory embryo sacs in the ovule
Detailed Solution
Apomixis is the formation of seeds without fertilisation.
In adventive embryony, embryos develop directly from diploid sporophytic cells of the ovule lying outside the embryo sac, mainly the nucellus or the integuments.
These cells divide, protrude into the embryo sac and develop into embryos.
It is common in Citrus and mango, where a seed often contains several embryos (polyembryony) in addition to the zygotic embryo.
Since these embryos come from the tissues of the mother plant, they are genetically identical to it.
So in adventive embryony the embryos develop directly from the nucellus or integuments.
In adventive embryony, embryos develop directly from diploid sporophytic cells of the ovule lying outside the embryo sac, mainly the nucellus or the integuments.
These cells divide, protrude into the embryo sac and develop into embryos.
It is common in Citrus and mango, where a seed often contains several embryos (polyembryony) in addition to the zygotic embryo.
Since these embryos come from the tissues of the mother plant, they are genetically identical to it.
So in adventive embryony the embryos develop directly from the nucellus or integuments.