In citrus,adventive embryony is caused by which of the following?

Which one of the following is $NOT$ a significance of polyembryony?
$i$. Polyembryony increases the chance of survival of the new plants.
$ii$. Nucellar polyembryony is greatly useful in horticulture.
$iii$. Seedless fruits are formed.
$iv$. Genetically identical plants are produced due to cleavage polyembryony.

Select the appropriate option for Apomixis.

Vegetatively propagated crops are very suitable for the maintenance of hybrid varieties because:

In which species has adventive polyembryony been reported?

In the case of polyembryony,if an embryo develops from the synergid and another from the nucellus,which is haploid and which is diploid?