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Adventive polyembryony in citrus is due to

1. nucellus
2. integuments
3. zygotic embryo
4. fertilised egg

Correct answer: nucellus

Solution

Adventive polyembryony in citrus occurs when additional embryos develop from nucellar cells, which are part of the ovule tissue. These embryos are genetically identical to the mother plant and are not formed from the zygote.

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