The single cell produced after fertilization is called
Zygote
The correct option is B.
Explanation of the correct option:
In fertilization, the male gamete fuses with the female gamete resulting in the formation of a single cell structure called zygote.
Explanation of the incorrect option:
Option A:
The single celled structure zygote develops into several celled structure called embryo.
Option C:
Bulb is a type of underground stem.
Option D:
Corm is a type of underground stem.
Final answer: The single cell produced after fertilization is called zygote.