What are the requirements in tissue culture?

After the demonstration of totipotency,a botanist wishes to produce identical plants from an angiosperm by tissue culture. The parts or tissues which are likely to yield haploid embryos are:

What is used as a culture medium for callus?

Which of the following is $NOT$ included in the applications of callus and suspension culture?

Why is the culture continuously agitated in a rotary shaker during suspension culture?
$(i)$ To facilitate gas exchange for the cells.
$(ii)$ To ensure proper mixing of nutrients in the medium.
$(iii)$ To sterilize the equipment used in the process.
$(iv)$ To maintain a uniform temperature for the inoculum.
$(v)$ This process causes cell aggregates to break into smaller,distinct cell clusters.

What is an embryoid?