Concept:
Polyembryony refers to formation of more than one embryo inside a seed.
Step 1:
In cleavage polyembryony, a single zygote divides into many embryos.
Step 2:
This phenomenon is commonly observed in orchids.
Step 3:
Citrus mainly shows adventive polyembryony rather than cleavage polyembryony.
Step 4:
Hence cleavage polyembryony is common in:
\[
\boxed{\text{Orchids}}
\]
\[
\boxed{\text{Correct Option = (2)}}
\]